阅读说明：本技术 一种低成本的混凝土及其制备方法 (Low-cost concrete and preparation method thereof ) 是由 周白露 刘兴平 袁其斌 于 2020-12-31 设计创作，主要内容包括：本发明公开了一种低成本的混凝土,按照重量份数计算包括以下各组分：粗骨料200-300份,细骨料180-220份,水泥140-160份,减水剂4-6份,黏土膏22-34份,废弃混凝土破碎料600-800份,浓度为14-18％的废弃砂浆液20-30份,水30-50份；本发明与现有技术相比,将废弃混凝土破碎料和废弃砂浆液作为本混凝土的原材料,大大降低了混凝土制备的成本；且将黏土膏作为增粘剂来与减水剂配合,大大增强了混凝土的粘接性能,从而提高混凝土的抗压强度。(The invention discloses low-cost concrete which comprises the following components in parts by weight: 300 parts of coarse aggregate 200-containing material, 220 parts of fine aggregate 180-containing material, 160 parts of cement 140-containing material, 4-6 parts of water reducing agent, 22-34 parts of clay paste, 800 parts of waste concrete broken material 600-containing material, 20-30 parts of waste sand slurry with the concentration of 14-18% and 30-50 parts of water; compared with the prior art, the invention takes the waste concrete crushed material and the waste sand slurry as the raw materials of the concrete, thereby greatly reducing the cost for preparing the concrete; and the clay paste is used as a tackifier to be matched with the water reducing agent, so that the bonding property of the concrete is greatly enhanced, and the compressive strength of the concrete is improved.)

1. The low-cost concrete is characterized by comprising the following components in parts by weight:

300 parts of coarse aggregate 200-containing material, 220 parts of fine aggregate 180-containing material, 160 parts of cement 140-containing material, 4-6 parts of water reducing agent, 22-34 parts of clay paste, 800 parts of waste concrete broken material 600-containing material, 20-30 parts of waste sand slurry with the concentration of 14-18% and 30-50 parts of water.

2. A low cost concrete according to claim 1 wherein: the coarse aggregate is broken pebbles with the particle size of 12-14mm, and the fine aggregate is fine sand with the particle size of 0.18-0.28 mm.

3. A low cost concrete according to claim 1 wherein: the cement is a polycarboxylic acid water reducing agent, and the water reducing rate of the cement is more than or equal to 25%.

4. A low cost concrete according to claim 1 wherein: the waste concrete crushed material is secondary utilization aggregate which is formed by crushing and processing waste concrete blocks, and the particle size of the secondary utilization aggregate is 16-18 mm.

5. A method for producing a low cost concrete according to any one of claims 1 to 4, comprising the steps of:

s1, preparing the components according to the mixture;

s2, adding the coarse aggregate, the fine aggregate, the waste concrete crushed material and the waste sand slurry into a stirrer and stirring for 35-45S;

s3, adding the cement and the clay paste into the stirrer and continuously stirring for 1-2 min;

and S4, dissolving the water reducing agent in water, adding the water reducing agent into the stirrer, continuously stirring, and stopping stirring after stirring for 8-9 min.

6. A method of making low cost concrete according to claim 5 wherein: and the waste sand slurry in the step S1 is prepared by separating iron slag, wood blocks and foamed plastic from the sand slurry collected on the stirring site by using a separation device and adding clay paste.

7. A method of making low cost concrete according to claim 6 wherein: the separation equipment comprises a separation tank body with a feeding hole at the top, a liquid inlet pipe is arranged above the side wall of the separation tank body, a liquid discharge pipe is arranged at the bottom of the side wall of the separation tank body, regulating valves are arranged on the liquid inlet pipe and the liquid discharge pipe, a plurality of energized solenoid assemblies are arranged at the feeding hole of the separation tank body at intervals along the horizontal direction, a telescopic stirring paddle adjustable along the height direction is rotatably connected to the bottom in the separation tank body, a floating object separation net is attached to the inner wall of the separation tank body along the vertical direction, the top end of the floating object separation net is rotatably connected with the inner wall of the separation tank body, the floating object separation net is positioned between the telescopic stirring paddle and the liquid inlet pipe and rotates, the rotating connecting end of the floating object separation net is connected with a regulating mechanism positioned on the side wall of the separation tank body, a traction; the adjusting mechanism is used for enabling the floating object separating net to rotate to be vertically attached to the inner wall of the separating tank body or horizontally arranged in the middle of the separating tank body, and the floating object separating net rotates to enable the telescopic stirring paddle to be adjusted in a telescopic mode through the traction mechanism; when the floater separating net is horizontally arranged at the middle part in the separating tank body, the inside of the separating tank body is divided into an upper cavity and a lower cavity.

8. A method of making a low cost concrete according to claim 7 wherein: the side wall of the separation tank body is internally provided with an installation cavity, the adjusting mechanism comprises two fixed pulleys rotatably arranged at the upper part in the installation cavity, an air cylinder fixedly arranged on the outer wall of the separation tank body and a guide block which is in sliding clamping connection with the inner wall of the separation tank body along the vertical direction, a movable pulley is arranged below the two fixed pulleys, a first guide wheel is rotatably arranged above the two fixed pulleys in the installation cavity, a second guide wheel is rotatably arranged below the movable pulley in the installation cavity, a first traction rope connected with the central position of the movable pulley is wound on the first guide wheel, the end part of the first traction rope, far away from the movable pulley, freely penetrates through the installation cavity and then is fixedly connected with the rotating side of the floating object separation net, the central position of the movable pulley is also fixedly connected with a second traction rope, and the second traction rope is sequentially wound on one of the fixed pulleys, the movable pulley, the other fixed pulley and the second guide wheel and then freely penetrates through, a piston rod of the cylinder penetrates through the separating tank body and then is rotatably connected with an adjusting rod which is rotatably connected with the guide block.

9. A method of making a low cost concrete according to claim 7 wherein: the telescopic stirring paddle comprises an outer rotating shaft which is rotatably arranged at the bottom in the separation tank body, a plurality of first stirring blades are circumferentially connected to the outer wall of the outer rotating shaft, an adjusting groove is formed in the top of the outer rotating shaft along the axial direction of the outer rotating shaft, two sliding grooves which are arranged in opposite directions are formed in the inner wall of the adjusting groove, the two sliding grooves are arranged along the axial direction of the outer rotating shaft, an inner rotating shaft which penetrates out of the top of the adjusting groove is slidably clamped in the adjusting groove, the inner rotating shaft is slidably clamped with the two sliding grooves, and a plurality of second stirring blades are circumferentially arranged at the end part of the inner rotating shaft; the traction mechanism is connected between the end part of the inner rotating shaft arranged outside the adjusting groove and the free end of the floating object separating net.

10. A method of making a low cost concrete according to claim 9 wherein: the traction mechanism comprises a clamping block rotatably clamped with the end part of the inner rotating shaft arranged outside the adjusting groove and a third traction rope connected between the clamping block and the free end of the floating object separating net.

Technical Field

The invention relates to the technical field of concrete processing, in particular to low-cost concrete and a preparation method thereof.

Background

Concrete is one of the most important civil engineering materials of the present generation.

The concrete has the characteristics of rich raw materials, low price and simple production process, so that the consumption of the concrete is increased more and more. Meanwhile, the concrete also has the characteristics of high compressive strength, good durability, wide strength grade range and the like. These characteristics make it very widely used, not only in various civil engineering, that is shipbuilding, machinery industry, ocean development, geothermal engineering, etc., but also concrete is an important material.

The existing concrete has higher cost due to high cost of raw materials in the preparation process.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a low-cost concrete to solve the problem that the cost of the existing concrete is high due to high cost of raw materials in the preparation process in the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme: the low-cost concrete comprises the following components in parts by weight:

300 parts of coarse aggregate 200-containing material, 220 parts of fine aggregate 180-containing material, 160 parts of cement 140-containing material, 4-6 parts of water reducing agent, 22-34 parts of clay paste, 800 parts of waste concrete broken material 600-containing material, 20-30 parts of waste sand slurry with the concentration of 14-18% and 30-50 parts of water.

Compared with the prior art, the invention has the following beneficial effects:

the waste concrete crushed material and the waste sand slurry are used as raw materials of the concrete, so that the cost for preparing the concrete is greatly reduced; and the clay paste is used as a tackifier to be matched with the water reducing agent, so that the bonding property of the concrete is greatly enhanced, and the compressive strength of the concrete is improved.

Furthermore, the coarse aggregate is broken pebbles with the particle size of 12-14mm, and the fine aggregate is fine sand with the particle size of 0.18-0.28 mm.

Further, the cement is a polycarboxylic acid water reducing agent, and the water reducing rate of the cement is more than or equal to 25%.

Further, the waste concrete crushed material is secondary utilization aggregate which is formed by crushing waste concrete blocks, and the particle size of the secondary utilization aggregate is 16-18 mm.

The invention also adopts the following technical scheme: a preparation method of low-cost concrete comprises the following steps:

s1, preparing the components according to the mixture;

s2, adding the coarse aggregate, the fine aggregate, the waste concrete crushed material and the waste sand slurry into a stirrer and stirring for 35-45S;

s3, adding the cement and the clay paste into the stirrer and continuously stirring for 1-2 min;

and S4, dissolving the water reducing agent in water, adding the water reducing agent into the stirrer, continuously stirring, and stopping stirring after stirring for 8-9 min.

Compared with the prior art, the invention has the following beneficial effects:

at first mix through abandonment mortar liquid and coarse aggregate, fine aggregate and the broken material of abandonment concrete, make coarse aggregate, fine aggregate and the broken material of abandonment concrete mix together after and formed certain bonding effect between them fully, later add cement and clay cream wherein, strengthen the bonding effect between each component fast, add the water-reducing agent who dissolves in water again, improve the mobility of concrete, and the structural stability and the structural strength of concrete are further strengthened to the cooperation of water-reducing agent and clay cream.

Further, the waste sand slurry in the step S1 is prepared by separating iron slag, wood blocks, and plastic plastics from the sand slurry collected at the stirring site by using a separation device, and adding clay paste.

Further, the separation equipment comprises a separation tank body with a feeding hole at the top, a liquid inlet pipe is arranged above the side wall of the separation tank body, a liquid discharge pipe is arranged at the bottom of the side wall of the separation tank body, regulating valves are arranged on the liquid inlet pipe and the liquid discharge pipe, a plurality of energized solenoid assemblies are arranged at the feeding hole of the separation tank body at intervals along the horizontal direction, a telescopic stirring paddle adjustable along the height direction is rotatably connected to the bottom in the separation tank body, a floating object separation net is attached to the inner wall of the separation tank body along the vertical direction, the top end of the floating object separation net is rotatably connected with the inner wall of the separation tank body, the floating object separation net is positioned between the telescopic stirring paddle and the liquid inlet pipe to rotate, the rotating connection end of the floating object separation net is connected with a regulating mechanism positioned on the side wall of the separation tank body, a traction mechanism; the adjusting mechanism is used for enabling the floating object separating net to rotate to be vertically attached to the inner wall of the separating tank body or horizontally arranged in the middle of the separating tank body, and the floating object separating net rotates to enable the telescopic stirring paddle to be adjusted in a telescopic mode through the traction mechanism; when the floater separating net is horizontally arranged at the middle part in the separating tank body, the inside of the separating tank body is divided into an upper cavity and a lower cavity.

Furthermore, an installation cavity is arranged in the side wall of the separation tank body, the adjusting mechanism comprises two fixed pulleys rotatably arranged at the upper part in the installation cavity, an air cylinder fixedly arranged on the outer wall of the separation tank body and a guide block which is in sliding clamping connection with the inner wall of the separation tank body along the vertical direction, a movable pulley is arranged below the two fixed pulleys, a first guide wheel is rotatably arranged above the two fixed pulleys in the installation cavity, a second guide wheel is rotatably arranged below the movable pulley in the installation cavity, a first traction rope connected with the central position of the movable pulley is wound on the first guide wheel, the end part of the first traction rope, far away from the movable pulley, freely penetrates through the installation cavity and then is fixedly connected with the rotating side of the floating object separation net, a second traction rope is fixedly connected with the central position of the movable pulley, and is freely wound on one of the fixed pulleys, the movable pulley, the other fixed pulley and the second guide wheel in sequence and then is fixedly connected with the guide block after, a piston rod of the cylinder penetrates through the separating tank body and then is rotatably connected with an adjusting rod which is rotatably connected with the guide block.

Furthermore, the telescopic stirring paddle comprises an outer rotating shaft which is rotatably arranged at the bottom in the separation tank body, a plurality of first stirring blades are circumferentially connected to the outer wall of the outer rotating shaft, an adjusting groove is formed in the top of the outer rotating shaft along the axial direction of the outer rotating shaft, two sliding grooves which are arranged in opposite directions are formed in the inner wall of the adjusting groove, the two sliding grooves are arranged along the axial direction of the outer rotating shaft, an inner rotating shaft which penetrates out of the top of the adjusting groove is slidably clamped in the adjusting groove, the inner rotating shaft is slidably clamped with the two sliding grooves, and a plurality of second stirring blades are circumferentially arranged at the end part of the inner rotating shaft which; the traction mechanism is connected between the end part of the inner rotating shaft arranged outside the adjusting groove and the free end of the floating object separating net.

Furthermore, traction mechanism includes the fixture block of end rotation joint outside arranging the adjustment tank with the internal rotation axle and connects the third haulage rope between the fixture block and the free end of floater separation net.

Drawings

Fig. 1 is a schematic structural view of a floating object separating net in the separating apparatus of the present invention in a state where it is horizontally arranged in the middle inside a separating tank body;

FIG. 2 is an enlarged view of a portion A of FIG. 1;

FIG. 3 is a schematic structural view of the separation apparatus of the present invention in which the floating material separation net is in a state of being vertically attached to the inner wall of the separation tank body;

fig. 4 is a partially enlarged view of a portion B in fig. 3.

Detailed Description

The present invention will be described in further detail below by way of specific embodiments:

reference numerals in the drawings of the specification include: the device comprises a separation tank body 1, a liquid inlet pipe 2, a liquid discharge pipe 3, an electrified solenoid component 4, a floating object separation net 5, a mounting cavity 6, a fixed pulley 7, a cylinder 8, a guide block 9, a movable pulley 10, a first guide wheel 11, a second guide wheel 12, a first traction rope 13, a second traction rope 14, an outer rotating shaft 15, a first stirring blade 16, a sliding groove 17, an inner rotating shaft 18, a second stirring blade 19, a fixture block 20, a third traction rope 21, an elastic telescopic rod 22, a funnel 23 and an adjusting rod 24.

Example 1

The embodiment of the invention provides low-cost concrete which comprises the following components in parts by weight: 200 parts of coarse aggregate, 180 parts of fine aggregate, 140 parts of cement, 4 parts of water reducing agent, 22 parts of clay paste, 600 parts of waste concrete crushed material, 20 parts of waste sand slurry with the concentration of 14% and 30 parts of water.

Wherein, the adopted coarse aggregate is broken pebbles with the particle size of 12-14mm, and the fine aggregate is fine sand with the particle size of 0.18-0.28 mm; therefore, the fine aggregate, the coarse aggregate and the waste concrete crushed material are mixed according to different grades of granularity, so that the porosity among formed concrete is reduced, and the structural strength of the formed concrete is improved.

The adopted cement is a polycarboxylic acid water reducing agent, and the water reducing rate is more than or equal to 25 percent; so that the prepared concrete has higher strength.

The adopted waste concrete crushed material is secondary utilization aggregate which is formed by crushing and processing waste concrete blocks, and the particle size of the secondary utilization aggregate is 16-18 mm; the waste concrete blocks are processed and then recycled for the second time, so that the production cost of the concrete is reduced, and the waste concrete blocks are mixed with fine aggregate and coarse aggregate according to different grades of granularity, so that the porosity among formed concrete is reduced, and the structural strength of the formed concrete is improved.

The concrete adopts the following preparation method, and the preparation method comprises the following specific steps:

s1, preparing the components according to the mixture;

s2, adding the coarse aggregate, the fine aggregate, the waste concrete crushed material and the waste sand slurry into a stirrer and stirring for 35S;

s3, adding the cement and the clay paste into the stirrer and continuously stirring for 1 min;

s4, dissolving the water reducing agent in water, adding the water reducing agent into a stirrer, continuously stirring, and stopping stirring after stirring for 8 min; the surface of the concrete has obvious metallic luster.

The prepared waste sand slurry is prepared by separating iron slag, wood blocks and plastic plastics from sand slurry collected on a stirring site by using a separation device and adding clay paste, so that the concentration of the waste sand slurry is 14%.

Example 2

The embodiment of the invention provides low-cost concrete which comprises the following components in parts by weight: 300 parts of coarse aggregate, 220 parts of fine aggregate, 160 parts of cement, 6 parts of water reducing agent, 34 parts of clay paste, 800 parts of waste concrete crushed material, 30 parts of waste sand slurry with the concentration of 18% and 50 parts of water.

Wherein, the adopted coarse aggregate is broken pebbles with the particle size of 12-14mm, and the fine aggregate is fine sand with the particle size of 0.18-0.28 mm; therefore, the fine aggregate, the coarse aggregate and the waste concrete crushed material are mixed according to different grades of granularity, so that the porosity among formed concrete is reduced, and the structural strength of the formed concrete is improved.

The adopted cement is a polycarboxylic acid water reducing agent, and the water reducing rate is more than or equal to 25 percent; so that the prepared concrete has higher strength.

The adopted waste concrete crushed material is secondary utilization aggregate which is formed by crushing and processing waste concrete blocks, and the particle size of the secondary utilization aggregate is 16-18 mm; the waste concrete blocks are processed and then recycled for the second time, so that the production cost of the concrete is reduced, and the waste concrete blocks are mixed with fine aggregate and coarse aggregate according to different grades of granularity, so that the porosity among formed concrete is reduced, and the structural strength of the formed concrete is improved.

The concrete adopts the following preparation method, and the preparation method comprises the following specific steps:

s1, preparing the components according to the mixture;

s2, adding the coarse aggregate, the fine aggregate, the waste concrete crushed material and the waste sand slurry into a stirrer and stirring for 45S;

s3, adding the cement and the clay paste into the stirrer and continuously stirring for 2 min;

s4, dissolving the water reducing agent in water, adding the water reducing agent into a stirrer, continuously stirring, and stopping stirring after stirring for 9 min; the surface of the concrete has obvious metallic luster.

The prepared waste sand slurry is prepared by separating iron slag, wood blocks and plastic plastics from sand slurry collected on a stirring site by using a separation device and adding clay paste, so that the concentration of the waste sand slurry is 18%.

Example 3

The embodiment of the invention provides low-cost concrete which comprises the following components in parts by weight: 220 parts of coarse aggregate, 190 parts of fine aggregate, 145 parts of cement, 4.5 parts of a water reducing agent, 26 parts of clay paste, 650 parts of waste concrete crushed material, 23 parts of waste sand slurry with the concentration of 15% and 36 parts of water.

Wherein, the adopted coarse aggregate is broken pebbles with the particle size of 12-14mm, and the fine aggregate is fine sand with the particle size of 0.18-0.28 mm; therefore, the fine aggregate, the coarse aggregate and the waste concrete crushed material are mixed according to different grades of granularity, so that the porosity among formed concrete is reduced, and the structural strength of the formed concrete is improved.

The adopted cement is a polycarboxylic acid water reducing agent, and the water reducing rate is more than or equal to 25 percent; so that the prepared concrete has higher strength.

The adopted waste concrete crushed material is secondary utilization aggregate which is formed by crushing and processing waste concrete blocks, and the particle size of the secondary utilization aggregate is 16-18 mm; the waste concrete blocks are processed and then recycled for the second time, so that the production cost of the concrete is reduced, and the waste concrete blocks are mixed with fine aggregate and coarse aggregate according to different grades of granularity, so that the porosity among formed concrete is reduced, and the structural strength of the formed concrete is improved.

The concrete adopts the following preparation method, and the preparation method comprises the following specific steps:

s1, preparing the components according to the mixture;

s2, adding the coarse aggregate, the fine aggregate, the waste concrete crushed material and the waste sand slurry into a stirrer and stirring for 38S;

s3, adding the cement and the clay paste into the stirrer and continuously stirring for 1.3 min;

s4, dissolving the water reducing agent in water, adding the water reducing agent into a stirrer, continuously stirring, and stopping stirring after stirring for 8.2 min; the surface of the concrete has obvious metallic luster.

The prepared waste sand slurry is prepared by separating iron slag, wood blocks and plastic plastics from sand slurry collected on a stirring site by using a separation device and adding clay paste, wherein the concentration of the waste sand slurry is 15%.

Example 4

The embodiment of the invention provides low-cost concrete which comprises the following components in parts by weight: 250 parts of coarse aggregate, 200 parts of fine aggregate, 150 parts of cement, 5 parts of water reducing agent, 29 parts of clay paste, 700 parts of waste concrete crushed material, 26 parts of waste sand slurry with the concentration of 17% and 40 parts of water.

Wherein, the adopted coarse aggregate is broken pebbles with the particle size of 12-14mm, and the fine aggregate is fine sand with the particle size of 0.18-0.28 mm; therefore, the fine aggregate, the coarse aggregate and the waste concrete crushed material are mixed according to different grades of granularity, so that the porosity among formed concrete is reduced, and the structural strength of the formed concrete is improved.

The adopted cement is a polycarboxylic acid water reducing agent, and the water reducing rate is more than or equal to 25 percent; so that the prepared concrete has higher strength.

The adopted waste concrete crushed material is secondary utilization aggregate which is formed by crushing and processing waste concrete blocks, and the particle size of the secondary utilization aggregate is 16-18 mm; the waste concrete blocks are processed and then recycled for the second time, so that the production cost of the concrete is reduced, and the waste concrete blocks are mixed with fine aggregate and coarse aggregate according to different grades of granularity, so that the porosity among formed concrete is reduced, and the structural strength of the formed concrete is improved.

The concrete adopts the following preparation method, and the preparation method comprises the following specific steps:

s1, preparing the components according to the mixture;

s2, adding the coarse aggregate, the fine aggregate, the waste concrete crushed material and the waste sand slurry into a stirrer and stirring for 40S;

s3, adding the cement and the clay paste into the stirrer and continuously stirring for 1.5 min;

s4, dissolving the water reducing agent in water, adding the water reducing agent into a stirrer, continuously stirring, and stopping stirring after stirring for 8.5 min; the surface of the concrete has obvious metallic luster.

The prepared waste sand slurry is prepared by separating iron slag, wood blocks and plastic plastics from sand slurry collected on a stirring site by adopting a separation device and adding clay paste, so that the concentration of the waste sand slurry is 17%.

Example 5

The embodiment of the invention provides low-cost concrete which comprises the following components in parts by weight: 280 parts of coarse aggregate, 210 parts of fine aggregate, 154 parts of cement, 6 parts of water reducing agent, 32 parts of clay paste, 750 parts of waste concrete crushed material, 30 parts of waste sand slurry with the concentration of 16% and 45 parts of water.

Wherein, the adopted coarse aggregate is broken pebbles with the particle size of 12-14mm, and the fine aggregate is fine sand with the particle size of 0.18-0.28 mm; therefore, the fine aggregate, the coarse aggregate and the waste concrete crushed material are mixed according to different grades of granularity, so that the porosity among formed concrete is reduced, and the structural strength of the formed concrete is improved.

The adopted cement is a polycarboxylic acid water reducing agent, and the water reducing rate is more than or equal to 25 percent; so that the prepared concrete has higher strength.

The adopted waste concrete crushed material is secondary utilization aggregate which is formed by crushing and processing waste concrete blocks, and the particle size of the secondary utilization aggregate is 16-18 mm; the waste concrete blocks are processed and then recycled for the second time, so that the production cost of the concrete is reduced, and the waste concrete blocks are mixed with fine aggregate and coarse aggregate according to different grades of granularity, so that the porosity among formed concrete is reduced, and the structural strength of the formed concrete is improved.

The concrete adopts the following preparation method, and the preparation method comprises the following specific steps:

s1, preparing the components according to the mixture;

s2, adding the coarse aggregate, the fine aggregate, the waste concrete crushed material and the waste sand slurry into a stirrer and stirring for 42S;

s3, adding the cement and the clay paste into the stirrer and continuously stirring for 1.8 min;

s4, dissolving the water reducing agent in water, adding the water reducing agent into a stirrer, continuously stirring, and stopping stirring after stirring for 8.7 min; the surface of the concrete has obvious metallic luster.

The prepared waste sand slurry is prepared by separating iron slag, wood blocks and plastic plastics from sand slurry collected on a stirring site by using a separation device and adding clay paste, so that the concentration of the waste sand slurry is 16%.

Comparative example 1

The embodiment of the invention provides low-cost concrete which comprises the following components in parts by weight: 280 parts of coarse aggregate, 210 parts of fine aggregate, 154 parts of cement, 6 parts of a water reducing agent, 750 parts of waste concrete crushed material, 30 parts of waste sand slurry with the concentration of 16% and 45 parts of water.

Wherein, the adopted coarse aggregate is broken pebbles with the particle size of 12-14mm, and the fine aggregate is fine sand with the particle size of 0.18-0.28 mm; therefore, the fine aggregate, the coarse aggregate and the waste concrete crushed material are mixed according to different grades of granularity, so that the porosity among formed concrete is reduced, and the structural strength of the formed concrete is improved.

The adopted cement is a polycarboxylic acid water reducing agent, and the water reducing rate is more than or equal to 25 percent; so that the prepared concrete has higher strength.

The adopted waste concrete crushed material is secondary utilization aggregate which is formed by crushing and processing waste concrete blocks, and the particle size of the secondary utilization aggregate is 16-18 mm; the waste concrete blocks are processed and then recycled for the second time, so that the production cost of the concrete is reduced, and the waste concrete blocks are mixed with fine aggregate and coarse aggregate according to different grades of granularity, so that the porosity among formed concrete is reduced, and the structural strength of the formed concrete is improved.

The concrete adopts the following preparation method, and the preparation method comprises the following specific steps:

s1, preparing the components according to the mixture;

s2, adding the coarse aggregate, the fine aggregate, the waste concrete crushed material and the waste sand slurry into a stirrer and stirring for 42S;

s3, adding the cement into the stirrer and continuously stirring for 1.8 min;

s4, dissolving the water reducing agent in water, adding the water reducing agent into a stirrer, continuously stirring, and stopping stirring after stirring for 8.7 min; the surface of the concrete has obvious metallic luster.

The prepared waste sand slurry is prepared by separating iron slag, wood blocks and plastic plastics from sand slurry collected on a stirring site by using a separation device and adding cement, so that the concentration of the waste sand slurry is 16%.

The concrete prepared in examples 1 to 5 and comparative example 1 were subjected to a compression resistance test to obtain the results in table 1:

	compressive strength (MPa)
		Example 1	31.2
Example 2	33.4
		Example 3	31.8
Example 4	32.1
		Example 5	32.6
Comparative example 1	24.6

TABLE 1

The data in table 1 can be used for analyzing that the low-cost concrete has stronger structural strength, the compressive strength of the concrete is more than 30MPa, and the comparison between the compressive strength data of the embodiment 5 and the compressive strength data of the comparative example 1 shows that the matching of the water reducing agent and the clay paste has the purpose of enhancing the compressive strength of the concrete, so that a certain synergistic effect is achieved.

Because concrete construction sites are relatively disordered, iron slag such as iron nails and iron blocks, wood blocks, foamed plastic and other garbage are often arranged on the construction ground, when workers collect the sand slurry on the construction ground, the iron slag, the wood blocks and the foamed plastic are easily collected in the sand slurry, and if the sand slurry containing the iron slag, the wood blocks and the foamed plastic is directly used as a raw material for processing concrete; the iron slag is easily rusted in the concrete to affect the structural strength of the cast concrete, and the wood blocks and the foamed plastic are easily rotted in the concrete to affect the structural strength of the cast concrete. The sand slurry collected on the construction ground is subjected to a separation filtration process using a separation apparatus as described below to remove iron slag, wood particles and foamed plastics from the sand slurry in each of the above-described examples 1 to 5 and comparative example 1.

With reference to fig. 1 and 3, the separation equipment comprises a separation tank body 1 with a feeding hole at the top, a liquid inlet pipe 2 is arranged above the side wall of the separation tank body 1, a liquid discharge pipe 3 is arranged at the bottom of the side wall of the separation tank body 1, regulating valves are arranged on the liquid inlet pipe and the liquid discharge pipe 3, a plurality of electrified solenoid assemblies 4 are arranged at intervals along the horizontal direction at the feeding hole of the separation tank body 1, a telescopic stirring paddle adjustable along the height direction is rotatably connected to the bottom in the separation tank body 1, a floating object separation net 5 is attached to the inner wall of the separation tank body 1 along the vertical direction, the top end of the floating object separation net 5 is rotatably connected with the inner wall of the separation tank body 1, the floating object separation net 5 is positioned between the telescopic stirring paddle and the liquid inlet pipe 2, the rotary connecting end of the floating object separation net 5 is connected with a regulating mechanism positioned on the side wall of, the traction mechanism is rotationally clamped with the telescopic stirring paddle; the adjusting mechanism is used for enabling the floating object separating net 5 to rotate to be vertically attached to the inner wall of the separating tank body 1 or horizontally arranged in the middle of the separating tank body 1, and the floating object separating net 5 rotates to enable the telescopic stirring paddle to be telescopically adjusted through the traction mechanism; when the floater separating net 5 is horizontally arranged at the middle part in the separating tank body 1, the inside of the separating tank body 1 is divided into an upper cavity and a lower cavity.

Adding the sand slurry collected on the construction ground into the separation tank body 1 from a feed inlet, wherein the floating object separation net 5 is attached to the inner wall of the separation tank body 1, and the telescopic stirring paddle is in a contracted state; the sand slurry enters the separation tank body 1 and is adsorbed by iron slag contained in the sand slurry through the electrified solenoid assemblies 4, the rest components of the sand slurry penetrate through gaps among the electrified solenoid assemblies 4 and enter the bottom in the separation tank body 1, because the density of wood blocks and foamed plastics is generally smaller than that of the sand slurry, the telescopic stirring paddle is rotated to stir the sand slurry and then the sand slurry is kept still in the separation tank body 1, the wood blocks and the foamed plastics float to the liquid level of the sand slurry, the adjusting mechanism operates the floating object separation net 5 to rotate from the vertical attachment on the inner wall of the separation tank body 1 to the horizontal arrangement in the middle in the separation tank body 1, the floating object separation net 5 separates the interior of the separation tank body 1 into upper parts, the lower two cavities, at the moment, the wood block and the foam plastic are both positioned above the floating object separation net 5 and are positioned in one cavity on the upper surface in the separation tank body 1; the floater separating net 5 extends the telescopic stirring paddle through the traction mechanism in the rotating process, and the telescopic stirring paddle is rotated to increase the stirring area of the telescopic stirring paddle in the separating tank body 1, so that components settled at the bottom in the separating tank body 1 are more quickly and fully mixed in the mortar liquid, then are discharged from the liquid discharge pipe 3, and are matched with the waste mortar liquid with proper concentration to be used as a raw material to be added into concrete; wherein, a feeding cylinder can be arranged on the outer wall of the separation tank body 1, clay paste is added into the separation tank body 1 at the position of the feeding cylinder to enable the extended telescopic stirring paddle to stir, so that the clay paste is dissolved in the sand slurry, and the sand slurry discharged from the liquid discharge pipe 3 is waste sand slurry with proper concentration; after discharging the sand slurry from the drain pipe 3, the adjusting mechanism makes the floater separating net 5 rotate reversely, the floater separating net 5 changes from the state of horizontally arranging the middle part in the separating tank body 1 into the state of vertically laminating on the inner wall of the separating tank body 1, wood blocks and foamed plastics on the floater separating net 5 drop to the bottom of the separating tank body 1 under the action of gravity in the process, the plurality of electrified solenoid assemblies 4 are powered off, then the iron slag adsorbed on the plurality of electrified solenoid assemblies 4 also drops to the bottom of the separating tank body 1, water is added into the tank body through the liquid inlet pipe 2, and the iron slag, the wood blocks and the foamed plastics are taken away from the drain pipe 3 through water.

Further, with reference to fig. 2 and 4, a mounting cavity 6 is opened in the side wall of the separation tank body 1, wherein the adopted adjusting mechanism comprises two fixed pulleys 7 rotatably arranged at the upper part in the mounting cavity 6, an air cylinder 8 fixedly arranged on the outer wall of the separation tank body 1, and a guide block 9 slidably clamped on the inner wall of the separation tank body 1 along the vertical direction, a movable pulley 10 is arranged below the two fixed pulleys 7, a first guide wheel 11 is rotatably arranged above the two fixed pulleys 7 in the mounting cavity 6, a second guide wheel 12 is rotatably arranged below the movable pulley 10 in the mounting cavity 6, a first traction rope 13 connected with the center position of the movable pulley 10 is wound on the first guide wheel 11, the end part of the first traction rope 13 far away from the movable pulley 10 freely penetrates out of the mounting cavity 6 and then is fixedly connected with the rotating side of the floating object separation net 5, a second traction rope 14 is fixedly connected with the center position of the movable pulley 10, the second traction rope 14 is wound on one of the fixed pulleys 7, the movable pulley 10, the other fixed pulley 7 and the second guide wheel 12 in sequence, then freely penetrates through the installation cavity 6 and then is fixedly connected with the guide block 9, and a piston rod of the air cylinder 8 penetrates into the separation tank body 1 and then is rotatably connected with an adjusting rod 24 which is rotatably connected with the guide block 9.

A piston rod of the air cylinder 8 extends to enable the piston rod to move towards the separation tank body 1, the guide block 9 moves downwards on the inner wall of the separation tank body 1 through the adjusting rod 24, the rotating arc length of a connecting point of the first traction rope 13 and the floating object separation net 5 can be three times of the moving distance of the guide block 9 through the traction of the first traction rope 13 and the second traction rope 14 and the matching of the two fixed pulleys 7 and the movable pulley 10, so that the floating object separation net 5 rotates to a state of being horizontally arranged in the middle of the separation tank body 1 from a state of being vertically attached to the inner wall of the separation tank body 1, and the rotation of the floating object separation net 5 is not limited; the piston rod of the cylinder 8 contracts to enable the piston rod to move towards the outside of the separation tank body 1, the adjusting rod 24 enables the guide block 9 to move upwards on the inner wall of the separation tank body 1, the floating object separation net 5 is under the action of gravity, so that the floating object separation net 5 is changed from a state of being horizontally arranged in the middle of the separation tank body 1 into a state of being vertically attached to the inner wall of the separation tank body 1, and the rotation of the floating object separation net 5 cannot be limited.

Wherein, open along vertical direction on the separating tank body 1 inner wall has the guide way, and guide block 9 and guide way slip joint come to guide the removal of guide block 9.

Further, with reference to fig. 1 and 3, the adopted telescopic stirring paddle comprises an outer rotating shaft 15 rotatably arranged at the bottom in the separation tank body 1, the outer wall of the outer rotating shaft 15 is circumferentially connected with a plurality of first stirring blades 16, the top of the outer rotating shaft 15 is provided with an adjusting groove along the axial direction thereof, the inner wall of the adjusting groove is provided with two sliding grooves 17 which are oppositely arranged, the two sliding grooves 17 are both arranged along the axial direction of the outer rotating shaft 15, an inner rotating shaft 18 which penetrates out of the top of the adjusting groove is slidably clamped in the adjusting groove, the inner rotating shaft 18 is slidably clamped with the two sliding grooves 17, and the end part of the inner rotating shaft 18 which is arranged outside the adjusting groove is circumferentially provided with a plurality of second stirring blades 19; the traction mechanism is connected between the end of the inner rotating shaft 18 which is arranged outside the adjusting groove and the free end of the floating object separating net 5.

The adopted traction mechanism comprises a fixture block 20 rotationally clamped with the end part of the inner rotating shaft 18 outside the adjusting groove and a third traction rope 21 connected between the fixture block 20 and the free end of the floating object separating net 5.

When the floating object separation net 5 rotates to be horizontally arranged in the middle of the separation tank body 1 from a state of being vertically attached to the inner wall of the separation tank body 1, the floating object separation net 5 enables the inner rotating shaft 18 to slide towards a direction far away from the outer rotating shaft 15 through the third hauling rope 21, the inner rotating shaft 18 is in sliding clamping connection with the two sliding grooves 17 to guide the movement of the inner rotating shaft 18, and meanwhile, when the outer rotating shaft 15 rotates, the inner rotating shaft 18 can synchronously move along with the outer rotating shaft 15; the fixture block 20 is connected with the inner rotating shaft 18 in a manner of preventing the inner rotating shaft 18 from being limited by the third traction rope 21 in the rotating process; when the floater separating net 5 is horizontally arranged in the separating tank body 1, the middle part of the floater separating net rotates to the state process vertically attached to the inner wall of the separating tank body 1, the inner rotating shaft 18 moves towards the inner wall of the adjusting tank under the action of self gravity, and the elastic telescopic rod 22 can be connected between the inner rotating shaft 18 and the inner wall of the adjusting tank to enhance the resetting capability of the inner rotating shaft, so that the telescopic stirring paddle contracts and shortens, the rotation limitation of the telescopic stirring paddle on the floater separating net 5 is avoided, and the height of the separating tank body 1 can be shortened.

The outer shaft 15 may be rotated by a motor.

Further, with reference to fig. 1 and 3, each of the energizing solenoid assemblies 4 includes a mounting cylinder rotatably connected to the inner wall of the separation tank 1 and an energizing solenoid fixedly disposed in the mounting cylinder, and the energizing solenoids in the plurality of energizing solenoid assemblies 4 are controlled to be turned on and off by the same switch; the electrified states of the electrified solenoid assemblies 4 are conveniently and simultaneously controlled, one end of each installation cylinder freely penetrates out of the separation tank body 1, and iron slag can be quickly separated from the outer wall of the installation cylinder by rotating the installation cylinder; the mounting cylinder can be made of ironwork, and when the electrified solenoid is electrified, the mounting cylinder is provided with magnetism; when the energized solenoid is de-energized, the magnetism on the mounting cartridge is lost.

Further, with reference to fig. 1 and 3, a hopper 23 may be integrally formed at the feed inlet of the separation tank body 1, and a plurality of energized solenoid assemblies 4 are uniformly distributed at the discharge outlet of the hopper 23, so that the plurality of energized solenoid assemblies 4 can uniformly distribute the sand slurry entering the separation tank body 1 downward.

Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.