阅读说明：本技术 一种加工成本较低的废弃混凝土再利用方法 (Waste concrete recycling method with low processing cost ) 是由 曹晶晶 张雪婷 姜南 于 2020-07-29 设计创作，主要内容包括：本发明公开了一种加工成本较低的废弃混凝土再利用方法,属于混凝土加工技术领域,通过设置水凝胶粉末,将制成的水凝胶进行干燥,并将水凝胶制成凝固块,随后将其粉碎同废弃混凝土颗粒状物料同等大小的粉末,此时将废弃混凝土颗粒状物料和水凝胶粉末加入搅拌设备内,对其进行混合,在对废弃混凝土颗粒状物料和水凝胶粉末加入搅拌设备内时,需要对搅拌设备进行设定,使其搅拌方向同一,由于水凝胶具有性质柔软,能保持一定的形状,能吸收大量的水的特性,使得混合完毕的改性混凝土具有一定的吸水性能,且在吸水之后其形状不易发生变化,增加了该改性混凝土内部的粘合性,由于水凝胶具有一定的吸水性能,使得该改性混凝土内部不易出现过于干燥的情况,降低了该改性混凝土因内部过于干燥而出现裂痕。(The invention discloses a method for recycling waste concrete with lower processing cost, which belongs to the technical field of concrete processing, and is characterized in that hydrogel powder is arranged, the prepared hydrogel is dried and made into a solidified block, then the solidified block is crushed into powder with the same size as the waste concrete granular material, at the moment, the waste concrete granular material and the hydrogel powder are added into a stirring device and are mixed, when the waste concrete granular material and the hydrogel powder are added into the stirring device, the stirring device needs to be set, so that the stirring direction is the same, as the hydrogel has soft property, a certain shape can be kept, a large amount of water can be absorbed, the mixed modified concrete has certain water absorption performance, the shape is not easy to change after water absorption, and the internal adhesiveness of the modified concrete is increased, the hydrogel has certain water absorption performance, so that the modified concrete is not easy to be over-dried, and cracks of the modified concrete caused by over-drying inside the modified concrete are reduced.)

1. The method for recycling the waste concrete with low processing cost is characterized by comprising the following steps of:

and S1, conveying the collected waste concrete into an ultrasonic crusher, setting the processing time of the ultrasonic crusher according to the size and the number of the waste concrete, wherein the setting is usually not more than 60min, drying the processed waste concrete scraps, and then carrying out primary screening on the dried waste concrete scraps to obtain the waste concrete granular materials with uniform particle sizes.

And S2, conveying the waste concrete granular materials to a calcining furnace, calcining the waste concrete granular materials at 1100 ℃ for 30min through calcination, naturally cooling to room temperature, carrying out secondary crushing on the cooled waste concrete granular materials, and carrying out secondary screening on the crushed waste concrete granular materials.

S3, dissolving sodium hydroxide in water, adding acrylic acid for pretreatment, sequentially adding corn starch, acrylamide and calcium carbonate, stirring, heating stirring equipment, adding an initiator for graft polymerization, pouring the reacted liquid into a mold, and drying at constant temperature to obtain the hydrogel.

And S4, drying the prepared hydrogel, preparing the hydrogel into a solidified block, crushing the solidified block into powder with the same size as the waste concrete granular material, adding the waste concrete granular material and the hydrogel powder into a stirring device, mixing the waste concrete granular material and the hydrogel powder, setting the stirring device to enable the stirring directions of the waste concrete granular material and the hydrogel powder to be the same when the waste concrete granular material and the hydrogel powder are added into the stirring device, and mixing the waste concrete granular material and the hydrogel powder for 15-30 min.

S5, placing the mixture of the waste concrete granular materials and the hydrogel powder, sand, stones, cement and water into a container, adding a proper amount of water into the container, stirring and mixing the mixture in one direction, and obtaining the modified recycled concrete after uniform stirring.

2. The method for recycling waste concrete with low processing cost as claimed in claim 1, wherein the method comprises the following steps: the mesh size of the screen mesh sieved in the step S1 is less than or equal to 4.0 mm.

3. The method for recycling waste concrete with low processing cost as claimed in claim 1, wherein the method comprises the following steps: the mesh size of the screen subjected to secondary screening in the step S2 is less than or equal to 2.3574 mm.

4. The method for recycling waste concrete with low processing cost as claimed in claim 1, wherein the method comprises the following steps: the drying temperature during the drying treatment is less than 60 ℃.

5. The method for recycling waste concrete with low processing cost as claimed in claim 1, wherein the method comprises the following steps: the mixed components of the hydrogel in the step S3 are 5% of corn starch, 22% of acrylic acid, 9% of acrylamide, 4% of ammonium persulfate, 4.5% of calcium carbonate, 10% of sodium hydroxide and 45.5% of water.

6. The method for recycling waste concrete with low processing cost as claimed in claim 1, wherein the method comprises the following steps: the mixture of the modified recycled concrete in the step S5 is composed of 50% of stones, 21% of sand, 18% of cement, 8% of water and 13% of a mixture of the waste concrete granular material and the hydrogel powder.

Technical Field

The invention belongs to the technical field of concrete processing, and particularly relates to a method for recycling waste concrete with low processing cost.

Background

With the vigorous development of commercial concrete in China, the concrete industry has become the building material field and the pillar industry of the field, however, the concrete is used as the largest artificial engineering material, once the building or the structure is disassembled, the concrete also becomes the 'mastership' of the building garbage correspondingly, at present, in China, the discharge amount of the concrete waste exceeds one hundred million tons every year, the waste concrete can not be recycled well in the past, meanwhile, a large amount of fields are needed for treating the building garbage (stacking or landfill), meanwhile, the cement industry is used as the pillar industry of the building material industry, is an unbelievable 'big household' in the aspects of resource and energy consumption, which is contrary to the current situation of resource shortage in the 21 st century and energy shortage, and the guiding idea of the cement industry development is pointed out in the 'cement industry development project plan', the circular economy is greatly developed, the ecological environment is protected, and the sustainable development of the cement industry is realized by means of technical progress.

At present, the mechanism for recycling the waste concrete after being crushed is also arranged partially, but the mechanism is only limited and used for collecting materials, the waste concrete is used after being crushed, the chemical property of the concrete inside the waste concrete is changed after the waste concrete is calcined, the waste concrete is fragile, the water absorption capacity of the concrete prepared by using the concrete recycling powder is poor, the adhesion between the internal concrete is poor, when the hot weather occurs, the moisture in the concrete can be quickly evaporated, the heat absorption capacity of the concrete is strong, the temperature of a road surface poured by using the concrete is high, the concrete is easy to crack, and the crack is easy to occur due to over-drying of the concrete.

Disclosure of Invention

Technical problem to be solved

In order to overcome the defects of the prior art, the invention provides a method for recycling waste concrete with low processing cost, which solves the problems that the chemical property of the interior of the concrete is changed after the concrete is calcined, so that the concrete is relatively fragile, the concrete prepared by using the concrete recycled powder has poor water absorption capacity and poor adhesion between internal concretes, when hot weather occurs, water in the concrete can be quickly evaporated, the heat absorption capacity of the concrete is strong, so that the temperature of a road surface cast by using the concrete is high, the road surface is easy to crack, and the concrete is easy to crack due to over drying.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme: a method for recycling waste concrete with low processing cost comprises the following steps:

and S1, conveying the collected waste concrete into an ultrasonic crusher, setting the processing time of the ultrasonic crusher according to the size and the number of the waste concrete, wherein the setting is usually not more than 60min, drying the processed waste concrete scraps, and then carrying out primary screening on the dried waste concrete scraps to obtain the waste concrete granular materials with uniform particle sizes.

And S2, conveying the waste concrete granular materials to a calcining furnace, calcining the waste concrete granular materials at 1100 ℃ for 30min through calcination, naturally cooling to room temperature, carrying out secondary crushing on the cooled waste concrete granular materials, and carrying out secondary screening on the crushed waste concrete granular materials.

S3, dissolving sodium hydroxide in water, adding acrylic acid for pretreatment, sequentially adding corn starch, acrylamide and calcium carbonate, stirring, heating stirring equipment, adding an initiator for graft polymerization, pouring the reacted liquid into a mold, and drying at constant temperature to obtain the hydrogel.

And S4, drying the prepared hydrogel, preparing the hydrogel into a solidified block, crushing the solidified block into powder with the same size as the waste concrete granular material, adding the waste concrete granular material and the hydrogel powder into a stirring device, mixing the waste concrete granular material and the hydrogel powder, setting the stirring device to enable the stirring directions of the waste concrete granular material and the hydrogel powder to be the same when the waste concrete granular material and the hydrogel powder are added into the stirring device, and mixing the waste concrete granular material and the hydrogel powder for 15-30 min.

S5, placing the mixture of the waste concrete granular materials and the hydrogel powder, sand, stones, cement and water into a container, adding a proper amount of water into the container, stirring and mixing the mixture in one direction, and obtaining the modified recycled concrete after uniform stirring.

As a further scheme of the invention: the mesh size of the screen mesh sieved in the step S1 is less than or equal to 4.0 mm.

As a further scheme of the invention: the mesh size of the screen subjected to secondary screening in the step S2 is less than or equal to 2.3574 mm.

As a further scheme of the invention: the drying temperature during the drying treatment is less than 60 ℃.

As a further scheme of the invention: the mixed components of the hydrogel in the step S3 are 5% of corn starch, 22% of acrylic acid, 9% of acrylamide, 4% of ammonium persulfate, 4.5% of calcium carbonate, 10% of sodium hydroxide and 45.5% of water.

As a further scheme of the invention: the mixture of the modified recycled concrete in the step S5 is composed of 50% of stones, 21% of sand, 18% of cement, 8% of water and 13% of a mixture of the waste concrete granular material and the hydrogel powder.

(III) advantageous effects

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

1. the waste concrete recycling method with lower processing cost is characterized in that hydrogel powder is arranged, the prepared hydrogel is dried and is prepared into a solidified block, the solidified block is crushed into powder with the same size as the waste concrete granular material, the waste concrete granular material and the hydrogel powder are added into stirring equipment to be mixed, when the waste concrete granular material and the hydrogel powder are added into the stirring equipment, the stirring equipment needs to be set, the stirring direction of the stirring equipment is the same, the hydrogel has the characteristic of soft property, can keep a certain shape and can absorb a large amount of water, so that the mixed modified concrete has certain water absorption performance, the shape of the modified concrete is not easy to change after water absorption, the adhesiveness in the modified concrete is increased, and the hydrogel has certain water absorption performance, the modified concrete is not easy to be over-dried, and cracks of the modified concrete caused by over-drying inside the modified concrete are reduced.

2. This lower abandonment concrete recycling method of processing cost, through carrying out ultrasonic crushing to the abandonment concrete, the second grade is smashed, first order screening and second grade screening, make the staff when smashing the abandonment concrete, can smash the screening to comparatively unified tiny granule with the abandonment concrete, make the staff when using this abandonment concrete powder, can produce the higher and lower modified concrete of the mixed degree of difficulty of quality, because the increase of cement fineness, the reaction area of contact increases, hydration reaction speed is accelerated, hydration degree improves, be favorable to the increase of this concrete intensity.

3. According to the method for recycling the waste concrete with the lower processing cost, the hydrogel powder is added, so that the water absorption characteristic and the heat absorption characteristic inside the concrete are improved, the absorbed water can be locked inside the concrete, and the water can be slowly evaporated when the weather is too hot, so that the temperature of the concrete is effectively reduced.

Detailed Description

The technical solution of the present patent will be described in further detail with reference to the following embodiments.

The invention provides a technical scheme that: a method for recycling waste concrete with low processing cost comprises the following steps:

and S1, conveying the collected waste concrete into an ultrasonic crusher, setting the processing time of the ultrasonic crusher according to the size and the number of the waste concrete, wherein the setting is usually not more than 60min, drying the processed waste concrete scraps, and then carrying out primary screening on the dried waste concrete scraps to obtain the waste concrete granular materials with uniform particle sizes.

And S2, conveying the waste concrete granular materials to a calcining furnace, calcining the waste concrete granular materials at 1100 ℃ for 30min through calcination, naturally cooling to room temperature, carrying out secondary crushing on the cooled waste concrete granular materials, and carrying out secondary screening on the crushed waste concrete granular materials.

S3, dissolving sodium hydroxide in water, adding acrylic acid for pretreatment, sequentially adding corn starch, acrylamide and calcium carbonate, stirring, heating stirring equipment, adding an initiator for graft polymerization, pouring the reacted liquid into a mold, and drying at constant temperature to obtain the hydrogel.

And S4, drying the prepared hydrogel, preparing the hydrogel into a solidified block, crushing the solidified block into powder with the same size as the waste concrete granular material, adding the waste concrete granular material and the hydrogel powder into a stirring device, mixing the waste concrete granular material and the hydrogel powder, setting the stirring device to enable the stirring directions of the waste concrete granular material and the hydrogel powder to be the same when the waste concrete granular material and the hydrogel powder are added into the stirring device, and mixing the waste concrete granular material and the hydrogel powder for 15-30 min.

S5, placing the mixture of the waste concrete granular materials and the hydrogel powder, sand, stones, cement and water into a container, adding a proper amount of water into the container, stirring and mixing the mixture in one direction, and obtaining the modified recycled concrete after uniform stirring.

The mesh size of the screen mesh screened in the first stage in the step S1 is less than or equal to 4.0 mm.

The mesh size of the screen subjected to secondary screening in the step S2 is less than or equal to 2.3574 mm.

The drying temperature during drying treatment is less than 60 ℃, the temperature is strictly controlled and is controlled to be 60 ℃ through drying treatment, so that the time for workers to wait for the cooling of the concrete powder can be reduced while the concrete powder is dried, and the workers are not easily scalded by the dried powder.

The mixed components of the hydrogel in the step S3 are 5% of corn starch, 22% of acrylic acid, 9% of acrylamide, 4% of ammonium persulfate, 4.5% of calcium carbonate, 10% of sodium hydroxide and 45.5% of water.

The mixture of the modified and regenerated concrete in the step S5 is composed of 50% of stones, 21% of sand, 18% of cement, 8% of water and 13% of the mixture of the waste concrete granular materials and the hydrogel powder, and 8% of water is added into the modified and regenerated concrete, so that workers can conveniently mix the materials, and the characteristics of the stones, the sand, the cement and the mixture of the waste concrete granular materials and the hydrogel powder can be fully exerted in the mixing process, so that the modified and regenerated concrete can be uniformly mixed, and cracks are not easy to occur due to over-drying.

Through arranging hydrogel powder, drying the prepared hydrogel, preparing the hydrogel into a solidified block, crushing the solidified block into powder with the same size as the waste concrete granular material, adding the waste concrete granular material and the hydrogel powder into stirring equipment, mixing the waste concrete granular material and the hydrogel powder, setting the stirring equipment when adding the waste concrete granular material and the hydrogel powder into the stirring equipment to ensure that the stirring directions of the waste concrete granular material and the hydrogel powder are the same, because the hydrogel has soft property and can keep a certain shape and absorb the characteristic of a large amount of water, the modified concrete after being mixed has certain water absorption performance, and the shape of the modified concrete after absorbing water is not easy to change, the adhesiveness inside the modified concrete is improved, because the hydrogel has certain water absorption performance, the modified concrete is not easy to excessively dry, the modified concrete is reduced from cracking caused by over-drying inside the modified concrete.

Through carrying out ultrasonic crushing to the abandonment concrete, the second grade is smashed, one-level screening and second grade screening, make the staff when smashing the abandonment concrete, can smash the screening to comparatively unified tiny granule with the abandonment concrete, make the staff when using this abandonment concrete powder, can produce the higher and lower modified concrete of the mixed degree of difficulty of quality, because the increase of cement fineness, reaction area of contact increases, hydration reaction speed accelerates, the hydration degree improves, be favorable to the increase of this concrete intensity.

Thereby improved the inside water absorption characteristic and the heat absorption characteristic of concrete through adding the aquogel powder for inside can pinning the moisture that absorbs of concrete, and when the weather is too hot, moisture will be comparatively slow evaporation, thereby the effectual temperature that reduces the concrete.

Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.