阅读说明：本技术 节能保温高强混凝土及其制备方法 (Energy-saving heat-insulating high-strength concrete and preparation method thereof ) 是由 范刚 于 2021-10-18 设计创作，主要内容包括：节能保温高强混凝土及其制备方法,涉及建筑材料技术领域,制备该混凝土的原料包括以下组分：页岩陶粒、硅灰、膨胀珍珠岩、聚乙烯醇纤维、发泡剂、减水剂、稳泡剂、水泥、水。本发明制备得到的混凝土28d的抗压强度可达28.7Mpa,强度较高,其导热系数低于0.3W/(m·K),保温和节能效果也处于较理想的水平。(An energy-saving heat-preservation high-strength concrete and a preparation method thereof relate to the technical field of building materials, and the concrete is prepared from the following raw materials: shale ceramsite, silica fume, expanded perlite, polyvinyl alcohol fiber, foaming agent, water reducing agent, foam stabilizer, cement and water. The concrete 28d prepared by the invention has the advantages of compressive strength of 28.7Mpa, high strength, heat conductivity coefficient lower than 0.3W/(m.K), and ideal heat preservation and energy-saving effects.)

1. The energy-saving heat-insulating high-strength concrete is characterized by comprising the following raw materials: shale ceramsite, silica fume, expanded perlite, polyvinyl alcohol fiber, foaming agent, water reducing agent, foam stabilizer, cement and water.

2. The energy-saving heat-insulating high-strength concrete as claimed in claim 1, wherein the raw materials are in parts by weight as follows: 40-50 parts of shale ceramsite, 12-18 parts of silica fume, 2-4 parts of expanded perlite, 0.1-0.15 part of polyvinyl alcohol fiber, 0.3-0.8 part of foaming agent, 2-2.5 parts of water reducing agent, 1.5-2 parts of foam stabilizer, 76-95 parts of cement and the balance of water.

3. The energy-saving heat-insulating high-strength concrete according to claim 2, characterized in that: the water-cement ratio of the water to the cement is 0.33-0.36.

4. The energy-saving heat-insulating high-strength concrete according to claim 2, characterized in that: the particle size of the shale ceramsite is not more than 20 mm.

5. The energy-saving heat-insulating high-strength concrete according to claim 2, characterized in that: the particle size of the expanded perlite is 0.1-0.5 mm.

6. The energy-saving heat-insulating high-strength concrete according to claim 2, characterized in that: the foaming agent is an animal protein foaming agent.

7. The energy-saving heat-insulating high-strength concrete according to claim 2, characterized in that: the water reducing agent is a polycarboxylic acid water reducing agent.

8. The energy-saving heat-insulating high-strength concrete according to claim 2, characterized in that: the foam stabilizer is PVP-K30.

9. A method for preparing the energy-saving heat-insulating high-strength concrete as claimed in any one of claims 1 to 8, which comprises the steps of:

(1) adding the weighed cement, silica fume, expanded perlite and polyvinyl alcohol fiber into a stirrer, and uniformly stirring;

(2) adding a proper amount of water into a stirrer, and then stirring;

(3) pouring the water reducing agent into a proper amount of water, and uniformly stirring to obtain a water reducing agent solution;

(4) adding the shale ceramsite into a stirrer, then adding the water reducing agent solution, and uniformly stirring;

(5) diluting a foaming agent by using a proper amount of water to obtain a foaming agent diluted solution, foaming the foaming agent diluted solution by using a foaming machine, and filling and weighing the prepared foam;

(6) and adding the foam and the foam stabilizer into a stirrer, and uniformly stirring to obtain the energy-saving heat-insulating high-strength concrete.

10. The method of claim 9, wherein: in the step (5), the foaming agent and water are diluted according to the proportion of 1: 35.

Technical Field

The invention relates to the technical field of building materials, in particular to energy-saving heat-preservation high-strength concrete and a preparation method thereof.

Background

Since 1996 national energy-saving construction conference, China has gone out of a great deal of energy-saving construction policies, and the wall insulation technology has been greatly developed. However, compared with the developed countries in the western world, China is still in the initial stage and has many problems. In some relatively laggard medium and small cities, particularly western cities, the relatively laggard technology of heat preservation in external walls is adopted, and the problem that buildings in many building projects in China have serious thermal bridge phenomena is solved.

The wall body is the main part of building energy consumption, and the heat preservation and energy conservation of the wall body is one of the main measures of building energy conservation, and the energy conservation accounts for more than 50 percent of the building energy. The key point of wall heat preservation is to improve the heat preservation performance of the wall, reduce heat loss and reduce the influence of the external temperature on the indoor temperature, thereby achieving the effect of reducing the energy consumption of the building. However, the existing wall materials are usually made of concrete, and the heat-insulating performance of common concrete and high-strength concrete is poor.

Chinese patent 105084840A discloses a class A fireproof high-efficiency homogeneous self-insulation building block which is prepared from raw materials consisting of ceramsite, ceramsite fragment particles and corresponding ingredients, has a good heat insulation effect, and solves the problem of energy conservation to a certain extent, but the compression strength of the building block is only 2.5Mpa, and the building block is not ideal in strength when used as a building wall.

Disclosure of Invention

One of the purposes of the invention is to provide energy-saving heat-insulation high-strength concrete which has better heat insulation and energy saving properties and higher compressive strength.

In order to solve the technical problems, the invention adopts the following technical scheme: an energy-saving heat-insulating high-strength concrete comprises the following raw materials: shale ceramsite, silica fume, expanded perlite, polyvinyl alcohol fiber, foaming agent, water reducing agent, foam stabilizer, cement and water.

Preferably, the raw materials are in the following weight portion ratio: 40-50 parts of shale ceramsite, 12-18 parts of silica fume, 2-4 parts of expanded perlite, 0.1-0.15 part of polyvinyl alcohol fiber, 0.3-0.8 part of foaming agent, 2-2.5 parts of water reducing agent, 1.5-2 parts of foam stabilizer, 76-95 parts of cement and the balance of water.

More preferably, the water to cement water cement ratio is between 0.33 and 0.36.

More preferably, the particle size of the shale ceramisite is not more than 20 mm.

More preferably, the particle size of the expanded perlite is from 0.1 to 0.5 mm.

More preferably, the foaming agent is an animal protein foaming agent.

More preferably, the water reducing agent is a polycarboxylic acid water reducing agent.

More preferably, the foam stabilizer is PVP-K30.

In addition, the invention also provides a method for preparing the energy-saving heat-preservation high-strength concrete, which comprises the following steps:

(1) and adding the weighed cement, silica fume, expanded perlite and polyvinyl alcohol fiber into a stirrer, and uniformly stirring.

(2) The appropriate amount of water was added to the blender and then stirred.

(3) And pouring the water reducing agent into a proper amount of water, and uniformly stirring to obtain a water reducing agent solution.

(4) And adding the shale ceramsite into a stirrer, then adding the water reducing agent solution, and uniformly stirring.

(5) Diluting the foaming agent by using a proper amount of water to obtain a foaming agent diluted solution, foaming the foaming agent diluted solution by using a foaming machine, and filling and weighing the prepared foam.

(6) And adding the foam and the foam stabilizer into a stirrer, and uniformly stirring to obtain the energy-saving heat-insulating high-strength concrete.

Wherein, the foaming agent and the water are diluted according to the proportion of 1:35 in the step (5).

The invention has the beneficial effects that: the concrete 28d prepared by the formula provided by the invention has the advantages of compressive strength of 28.7Mpa, high strength, heat conductivity coefficient lower than 0.3W/(m.K), and ideal heat preservation and energy-saving effects.

Drawings

FIG. 1 is a line drawing of the compressive strength curves of the foam concrete with different water-cement ratios in the invention.

Detailed Description

The energy-saving heat-insulating high-strength concrete provided by the invention comprises the following raw materials in parts by weight: shale ceramsite, silica fume, expanded perlite, polyvinyl alcohol fiber, foaming agent, water reducing agent, foam stabilizer, cement and balance water.

Wherein, the cement is P.O 42.5.5 cement produced by southern Leishui cement plant, the basic performance of the cement is shown in Table 1, the index meets the requirement of GB175-2007 ordinary Portland cement, and the requirement of the embodiment is met.

TABLE 1 basic Properties of the cements

Examples water was used as laboratory tap water. The silica fume has fine particles and large specific surface area, can be used as a mineral admixture for replacing part of cement, can fill gaps among cement particles, improve the internal structure of concrete, and improve the compressive strength of foam concrete, and the performance indexes of the silica fume are shown in a table 2.

TABLE 2 silica fume Performance index

The expanded perlite has the characteristics of light weight and porosity, is used as fine aggregate to replace partial ceramsite in the experiment, has the particle size of 0.1-0.5mm, can reduce the heat conductivity coefficient while reducing the self weight of the ceramsite foam concrete, improves the heat insulation performance of the concrete, and has a certain sound insulation effect.

Polyvinyl alcohol fiber (KURALON K-II) is selected as the reinforcing fiber, so that the foam concrete has the characteristics of high elasticity and high tensile strength, and proper amount of polyvinyl alcohol fiber is doped into the foam concrete to stabilize the foam, improve the pore structure of the foam concrete and improve the mechanical property and the heat insulation property of the foam concrete; meanwhile, the polyvinyl alcohol fiber can be tightly bonded with cement, so that shrinkage and cracking of the ceramsite foam concrete in the drying process are effectively prevented, the cracking resistance of the ceramsite foam concrete is improved, and the performance indexes are shown in table 3.

TABLE 3 polyvinyl alcohol fiber Performance index (supplied by the manufacturer)

The selection of the foaming agent in the foam concrete and the preparation of the foam are vital, the foaming agent prepared by the animal protein foaming agent is more fine and uniform, the foam stability is good, the communicated foam is less, the breakage is not easy, and the like, so the animal protein foaming agent is selected. The appearance is dark brown liquid with slight rancid taste and pH value of 6.5-7.0. The animal protein foaming agent is an additive prepared by mixing a product obtained by a series of chemical reactions and physical treatments with other chemical raw materials. The bubble liquid film prepared by the animal protein foaming agent is tough and elastic, the foam is stable and is not easy to break, most of the generated foam concrete air holes are closed spherical, and the number of communicating holes is small.

The water reducing agent is selected from polycarboxylic acid water reducing agent, the water reducing rate is 20%, and the performance indexes are shown in Table 4

TABLE 4 main Performance index of polycarboxylate superplasticizer

The foam stabilizer has the functions of prolonging and stabilizing foam and keeping long-term performance, and the proper amount of foam stabilizer is added into foam concrete, so that the foam can be uniformly distributed, the pore structure is improved, communicated pores are reduced, and the mechanical property and the heat conductivity of the concrete can be improved to a certain extent. Table 5 shows the main performance indexes of the foam stabilizer (PVP K30).

TABLE 5 Main Performance index of foam stabilizer

The shale ceramisite is also called as the expanded shale. The light coarse aggregate with the grain diameter of more than 5mm, which is formed by crushing, screening or grinding the clay slate, the shale and the like into balls and sintering and expanding, is used as the shale ceramsite. The shale ceramsite is divided into the following components according to the process method: crushing, sieving and sintering to obtain the shale ceramsite. The spherical shale ceramsite is formed by grinding, balling and sintering expansion; the baked and expanded shale ceramsite has an enamel surface layer, contains more closed and disconnected air holes inside, and has the advantages of low density, high strength and low heat conductivity coefficient. The main raw material of the fly ash ceramsite is solid waste, namely fly ash. The fly ash ceramsite is mainly prepared from fly ash, a proper amount of gypsum, lime, an additive and the like are added to produce artificial lightweight aggregate through natural hydraulic reaction or hydration and hydrothermal synthesis reaction, and the artificial lightweight aggregate has the advantages of high internal porosity, high cylinder pressure strength, good frost resistance, small density, porous interior and uniform components and forms, so the artificial lightweight aggregate has good heat preservation performance and is generally applied to heat preservation, sound insulation and heat insulation materials. The basic properties of the shale ceramisite and the fly ash ceramisite used in the examples are shown in Table 6.

TABLE 6 Haydite Performance index

Before the examples are explained, in order to determine the optimal water-cement ratio, a large number of experiments are carried out between 0.3 and 0.4, foam concrete is prepared and the compressive strength of the foam concrete is tested, a group of water-cement ratios with better mixture workability and mechanical property are selected, a foam concrete flat plate heat-conducting test block is prepared according to the same proportion, and the heat-conducting coefficient of the foam concrete flat plate heat-conducting test block is measured. Table 7 shows the compressive strengths of the foam concretes with different water-cement ratios.

TABLE 7 compressive strengths of foam concretes with different water-cement ratios

Table 7 shows that the influence of the water-cement ratio on the mixture workability and the compressive strength is researched by only changing the water-cement ratio under the conditions of no aggregate, silica fume, expanded perlite, polyvinyl alcohol fiber and unchanged mixing amount of other raw materials. Figure 1 is a graph of the compressive strength comparison lines for 7d and 28 d.

As can be seen from table 7 and fig. 1: the 7d compressive strength is 0.33 ≈ 0.34 > 0.35 > 0.36; 28d compressive strength of 0.33 to 0.36 to 0.34 to 0.35; wherein the increase rate of the 7 d-28 d strong pressure intensity is 0.36 & gt 0.33 & gt 0.35 & gt 0.34. In the experimental process, when the water cement ratio is 0.33 and 0.34, the mixture workability is poor, the fluidity is low, and the 7d compressive strength is high, but the 28d compressive strength is not increased to an ideal extent, probably because the water cement ratio is too low, the interior of the concrete is not completely hydrated, and the expected strength of the experiment is not reached. When the water cement ratio is 0.35 to 0.36, the concrete mixture has good fluidity, no pan sticking phenomenon and good mixture workability, and meets the experimental requirements. By comparison, the water cement ratio of 0.36 with a large increase rate of the compressive strength of 7d to 28d is selected as the mixing ratio.

To facilitate understanding of those skilled in the art, the present invention will be further described in conjunction with the following examples and drawings, which are set forth to illustrate, but are not to be construed as the limit of the present invention, wherein the examples and comparative examples are made or tested with the following instruments and equipment: the system comprises an SLD-600 type single-horizontal-shaft compulsory concrete mixer, an UZJ-15 type vertical mortar mixer, an electronic balance, a TYE-2000E type pressure testing machine, a SHBY-900B type standard cement concrete curing box, an IMDRY 3001-II type double-plate heat conductivity coefficient tester, a 101-3B type electric heating air blast constant-temperature drying box and a home-decoration type cement foaming machine.

Example 1

The energy-saving heat-insulating high-strength concrete comprises the following raw materials in parts by weight: 40 parts of shale ceramsite, 12 parts of silica fume, 2 parts of expanded perlite, 0.1 part of polyvinyl alcohol fiber, 0.3 part of foaming agent, 2 parts of water reducing agent, 1.5 parts of foam stabilizer, 76 parts of cement and the balance of water, wherein the water-cement ratio of water to cement is 0.36.

The preparation method comprises the following steps:

(1) and adding the weighed cement, silica fume, expanded perlite and polyvinyl alcohol fiber into a stirrer, stirring for 2min, and uniformly stirring.

(2) The appropriate amount of water was added to the blender and then stirred.

(3) And pouring the water reducing agent into a proper amount of water, and uniformly stirring to obtain a water reducing agent solution.

(4) And adding the shale ceramsite into a stirrer, then adding the water reducing agent solution, stirring for 3min, and uniformly stirring.

(5) Diluting a foaming agent and a proper amount of water according to a ratio of 1:35 to obtain a foaming agent diluted solution, foaming the foaming agent diluted solution by using a foaming machine, and filling and weighing the prepared foam.

(6) And adding the foam and the foam stabilizer into a stirrer, stirring for 3min, and uniformly stirring to obtain the energy-saving heat-preservation high-strength concrete.

Forming the energy-saving heat-insulating high-strength concrete:

preparing two heat conducting flat molds with the size of 300 multiplied by 30mm, two sets of three cubic molds with the size of 100 multiplied by 100mm, coating a release agent on the surfaces of the molds, and filling a piece of paper at a small hole at the bottom of the three cubic molds to ensure that the molds can be smoothly released.

Secondly, placing the heat-conducting flat plate mold on a glass sheet and coating a release agent, placing the energy-saving heat-preservation high-strength concrete mixture into the heat-conducting flat plate mold, and fully vibrating and scraping; and (2) loading the energy-saving heat-preservation high-strength concrete mixture into a cubic triple-link die, half the mixture is loaded firstly, the mixture is fully and uniformly inserted and tamped and then filled, the mixture is fully inserted and tamped, vibrated and then scraped, and the scraped surface has no bubbles.

(3) Making an experimental mark: molding date, experimental mixing ratio and the like; and covering a layer of preservative film on the surface of the formed test mold to prevent the water from evaporating.

(4) And placing the formed test mold into a constant-temperature constant-humidity standard curing box for curing.

Maintaining energy-saving heat-insulating high-strength concrete:

the concrete test block maintenance mode of this embodiment is standard wet maintenance, and the maintenance case is: SHBY-900B type standard curing box for cement concrete. The temperature is 20 +/-1 ℃, and the relative humidity reaches over 95 percent.

And after the test block is maintained for 24 hours, taking out the test mold from the maintenance box for demolding, marking the surface of the demolded test block, and then continuously putting the test block back into the maintenance box for maintenance. And (5) after the test block finishes the specified curing time (7 d, 28 d), taking out the test block and testing the performance of the test block.

As the heat-conducting flat test block does not need to be tested for mechanical strength, only the heat conductivity coefficient is required to be measured, in the experiment, the heat-conducting flat test block is maintained in a maintenance box for 3-7 days, is placed in an oven for drying for 12 hours and is fully cooled (the temperature of the oven is set to be 105 ℃), the heat conductivity coefficient can be measured, and the compressive strength can be measured when the test block reaches the maintenance age.

Example 2

The embodiment is different from the embodiment 1 only in the weight part ratio of the energy-saving heat-insulating high-strength concrete raw materials, specifically, the energy-saving heat-insulating high-strength concrete comprises the following raw materials in weight part ratio: 46 parts of shale ceramsite, 16 parts of silica fume, 3.2 parts of expanded perlite, 0.13 part of polyvinyl alcohol fiber, 0.6 part of foaming agent, 2.3 parts of water reducing agent, 1.9 parts of foam stabilizer, 87 parts of cement and the balance of water, wherein the water-cement ratio of water to cement is 0.36.

Example 3

The embodiment is different from the embodiment 1 only in the weight part ratio of the energy-saving heat-insulating high-strength concrete raw materials, specifically, the energy-saving heat-insulating high-strength concrete comprises the following raw materials in weight part ratio: 50 parts of shale ceramsite, 18 parts of silica fume, 4 parts of expanded perlite, 0.15 part of polyvinyl alcohol fiber, 0.8 part of foaming agent, 2.5 parts of water reducing agent, 2 parts of foam stabilizer, 95 parts of cement and the balance of water, wherein the water-cement ratio of water to cement is 0.36.

Comparative example 1

The difference between the comparative example and the example 1 is only that the raw materials of the concrete and the weight parts of the components are different, specifically, the concrete comprises the following raw materials in parts by weight: 40 parts of fly ash ceramsite, 12 parts of silica fume, 2 parts of expanded perlite, 0.1 part of polyvinyl alcohol fiber, 0.3 part of foaming agent, 2 parts of water reducing agent, 1.5 parts of foam stabilizer, 76 parts of cement and the balance of water, wherein the water-cement ratio of water to cement is 0.36.

Comparative example 2

The difference between the comparative example and the comparative example 1 is only that the concrete raw materials are different in the weight part ratio of each component, and specifically, the concrete raw materials comprise the following raw materials in weight part ratio: 46 parts of fly ash ceramsite, 16 parts of silica fume, 3.2 parts of expanded perlite, 0.13 part of polyvinyl alcohol fiber, 0.6 part of foaming agent, 2.3 parts of water reducing agent, 1.9 parts of foam stabilizer, 87 parts of cement and the balance of water, wherein the water-cement ratio of water to cement is 0.36.

Comparative example 3

The difference between the comparative example and the comparative example 1 is only that the concrete raw materials are different in the weight part ratio of each component, and specifically, the concrete raw materials comprise the following raw materials in weight part ratio: 50 parts of fly ash ceramsite, 18 parts of silica fume, 4 parts of expanded perlite, 0.15 part of polyvinyl alcohol fiber, 0.8 part of foaming agent, 2.5 parts of water reducing agent, 2 parts of foam stabilizer, 95 parts of cement and the balance of water, wherein the water-cement ratio of water to cement is 0.36.

Comparative example 4

The concrete comprises the following raw materials: 46 parts of clay ceramsite, 10 parts of furnace slag, 15 parts of fly ash, 16 parts of silica fume, 4 parts of perlite, 2.3 parts of sodium methine naphthalenesulfonate water reducer, 1.4 parts of ferric chloride waterproof agent, 1.2 parts of powder reducer, 87 parts of cement and the balance of water. The preparation method comprises the following steps: mixing clay ceramsite, furnace slag, perlite, cement, fly ash, silica fume, sodium methionate water reducing agent, ferric chloride waterproofing agent and powder reducing agent, and putting the mixture into a stirrer to be uniformly stirred to obtain the concrete.

The formulations of the ceramsite foam concretes of examples 1-3 and comparative examples 1-3 are shown in Table 8 and the following Table 8.

TABLE 8 Haydite foam concrete ratio

Table 8 ceramsite and foam concrete mixing ratio

Test of compressive strength and heat conductivity coefficient

Under the conditions that the water-cement ratio is determined to be 0.36 and the mixing amount of each raw material is unchanged, shale ceramsite and fly ash ceramsite are selected to prepare ceramsite foam concrete with different mixing amounts, the heat conductivity coefficients of the ceramsite foam concrete are measured, comparative analysis is carried out, the influence of the ceramsite variety and the ceramsite mixing amount on the heat conductivity coefficient of the foam concrete and the influence rule of different density grades on the heat conductivity coefficient of the foam concrete are explored, and the ceramsite variety and the mixing amount with the standard heat conductivity coefficient are obtained; the compression strength of each group of test blocks is taken as reference, a group of mixing proportions with higher compression strength and lower heat conductivity coefficient are selected, and the optimal ceramsite variety and mixing amount are determined.

(1) Test for compressive Strength

The compression strength adopts a cubic compression strength testing method, and a testing instrument is a TYE-2000E type compression testing machine. Starting a pressure tester and a computer, setting parameters, age, loading rate, test block standard and the like by using the computer, and setting the loading rate to be 4.0 KN/s; cleaning the upper and lower press plates of the pressure testing machine by using a brush, selecting the side surface of the three-connection module test block as a stress surface, putting the stress surface into the central positions of the upper and lower press plates of the pressure testing machine, and starting testing. The set of three-way models was three data, the data was recorded and the average was calculated, and the test results are shown in table 9 below.

TABLE 9 concrete 28d compressive Strength

As can be seen from the compressive strength data in Table 9, the combination ratio with larger compressive strength is 46% of the shale ceramsite (46 parts by weight), and the compressive strength of the shale ceramsite can reach 28.7MPa, while the comparative example 4 has more differences from the formula of the embodiment, and the compressive strength of the prepared concrete 28d is only 2.8 MPa.

It can be seen from comparison with comparative example 4 that, under the condition of the same amount of doped ceramsite, the formulation of example 2 further comprises the components of the polyvinyl alcohol fiber, the foaming agent and the foam stabilizer, so that the polyvinyl alcohol fiber can be inferred to play the roles of stabilizing foam and improving the void structure of foam concrete, thereby improving the mechanical properties of the foam concrete, that is, in the formulation of the invention, the foam obtained by foaming with the foaming agent and the polyvinyl alcohol fiber play a significant synergistic role.

(2) Flat plate heat conductivity coefficient measurement experiment

Preparing two test blocks with the same proportion, and measuring the thickness of the test blocks by using a measuring ruler (5-45 mm of the standard of a flat-plate thermal conductivity coefficient measuring instrument); the surface of the test block should be smooth (the flatness standard is 0.1 mm), and if the surface of the test block has concave and convex points, the surface can be polished by sand paper.

Plugging a power supply, turning on a computer, and turning on a power supply switch at the back of the main machine of the heat conduction instrument; two test blocks are installed, the test blocks need to be placed flatly, a handle on the surface of a furnace cover is screwed, and the number of readings of a pressure module above the furnace cover is required to be less than or equal to 2.50.

Opening a water bath, circulation and refrigeration switch, and setting the temperature of a cold plate to be 15 ℃; entering a main interface of an IMDRY 3001-II thermal conductivity coefficient tester on a computer, and inputting a submission unit, a detection unit, a detector, a test piece name and a serial number; setting parameters: the temperature of a hot plate (35 ℃), the thickness (30-31 mm) and the preheating time (30 min); the total test time was 150 min. And after the parameter setting is finished, clicking to start testing, and starting an experiment.

After the experiment is finished, the software system automatically calculates the measurement result and makes data record; closing the refrigeration, circulation and power switch in sequence; and taking out the test block, putting the test block into a protection plate, resetting the equipment and closing the power supply of the computer and the heat conduction instrument. The test results are shown in table 10 below.

TABLE 10 experimental group thermal conductivity coefficient experimental results

As can be seen from table 10:

(1) for ceramsite varieties, the heat conductivity coefficient of the shale ceramsite foam concrete is lower than that of the fly ash ceramsite foam concrete, namely the heat insulation effect of the shale ceramsite foam concrete is better.

(2) As for the addition amount of the ceramsite, the thermal conductivity coefficient is in a trend of increasing first and then decreasing along with the increase of the addition amount of the ceramsite.

(3) For the density grade of concrete, the heat conductivity coefficient is in a trend of rising first and then falling along with the increase of the density.

Overall, the thermal conductivity of each of the examples and comparative examples was less than 0.3W/(m.k).

The energy-saving heat-insulating high-strength concrete provided by the embodiment has the following results through test and research:

(1) testing the mechanical property and the heat conductivity coefficient of the ceramsite by experiments on the variety and the mixing amount of the ceramsite; determining the ceramsite variety as shale ceramsite, wherein the optimal mixing amount is 46%.

(2) The experimental results show that the thermal insulation performance of the foam concrete is improved by the two kinds of the ceramsite within the range of 40% -50%, but the mechanical performance of the foam concrete is tested to obtain that the thermal insulation performance and the mechanical performance of the foam concrete are most ideal when the mixing amount of the shale ceramsite is 46%.

(3) For ceramsite varieties; the heat conductivity coefficient of the shale ceramsite foam concrete is lower than that of the fly ash ceramsite foam concrete, namely the heat insulation effect of the shale ceramsite foam concrete is better. For the mixing amount of the ceramsite; in the range of 40-50%, the thermal conductivity coefficient is increased with the addition of the ceramsite and is in a trend of increasing first and then decreasing. For the density grade of the ceramsite foam concrete; in the range of 1000kg/m3-1300kg/m3, the thermal conductivity of the foam concrete tends to increase first and then decrease with the increase of the density of the foam concrete.

Finally, the present invention can provide 1m³The optimum formulation for the amount of foamed concrete is shown in Table 11 and Table 11 below.

TABLE 11 shale ceramsite foam concrete optimized mix proportion of 1m³Amount of material used

Table 11 shale ceramsite foam concrete optimum mixing proportion 1m³Amount of material used

As can be seen from Table 11, 1m of the present invention³Compared with the existing concrete, the total weight of all the material consumption of the foam concrete is much lighter, and therefore, the energy-saving heat-preservation high-strength concrete provided by the invention can achieve light weight and high strength simultaneously on the premise of ensuring low heat preservation coefficient, but the existing foam concrete on the market is hardly capable of comprehensively achieving the indexes, and therefore the existing foam concrete cannot be used as a building main body material, such as a structure of a load-bearing wall and the like, but the concrete provided by the invention has high enough strength, can completely meet the concrete requirement of a C25 grade specification, and can be directly used as the building main body material, so that the market application value and the prospect of the invention are huge.

In fact, the domestic research on the foam concrete mainly includes the influence of foaming agents, admixtures and cementing materials on the performance of the foam concrete, but besides the influence factors, the factors such as ceramsite mixing amount, density, types and water reducing agents also have influence on the performance of the foam concrete, for example, the ceramsite mixing amount is not the better as the mixing amount is larger, but has the optimal mixing amount value, the compressive strength of the foam concrete can show a rising-falling curve along with the increase of the ceramsite mixing amount, and the highest strength point is the optimal value of the ceramsite mixing amount under the condition that other conditions are not changed.

The above embodiments are preferred implementations of the present invention, and the present invention can be implemented in other ways without departing from the spirit of the present invention.

Some of the drawings and descriptions of the present invention have been simplified to facilitate the understanding of the improvements over the prior art by those skilled in the art, and some other elements have been omitted from this document for the sake of clarity, and it should be appreciated by those skilled in the art that such omitted elements may also constitute the subject matter of the present invention.