CN117049837A - Preparation method of recycled concrete - Google Patents
Preparation method of recycled concrete Download PDFInfo
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- CN117049837A CN117049837A CN202210487751.5A CN202210487751A CN117049837A CN 117049837 A CN117049837 A CN 117049837A CN 202210487751 A CN202210487751 A CN 202210487751A CN 117049837 A CN117049837 A CN 117049837A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000002699 waste material Substances 0.000 claims abstract description 70
- 238000002156 mixing Methods 0.000 claims abstract description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical class O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000003469 silicate cement Substances 0.000 claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 17
- 239000002893 slag Substances 0.000 claims abstract description 17
- 239000010959 steel Substances 0.000 claims abstract description 17
- 239000004575 stone Substances 0.000 claims abstract description 17
- 238000003756 stirring Methods 0.000 claims abstract description 14
- 230000001360 synchronised effect Effects 0.000 claims abstract description 12
- 238000009413 insulation Methods 0.000 claims abstract description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 40
- 239000002253 acid Substances 0.000 claims description 16
- 235000019353 potassium silicate Nutrition 0.000 claims description 15
- 239000000843 powder Substances 0.000 claims description 15
- 229920002379 silicone rubber Polymers 0.000 claims description 15
- 239000004945 silicone rubber Substances 0.000 claims description 15
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 15
- 239000000654 additive Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical group CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 10
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 10
- 230000000996 additive effect Effects 0.000 claims description 10
- 229910052796 boron Inorganic materials 0.000 claims description 10
- 239000003638 chemical reducing agent Substances 0.000 claims description 10
- 239000000835 fiber Substances 0.000 claims description 10
- 239000003112 inhibitor Substances 0.000 claims description 10
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 10
- 239000002002 slurry Substances 0.000 claims description 10
- 238000002791 soaking Methods 0.000 claims description 10
- 239000004094 surface-active agent Substances 0.000 claims description 10
- 239000004568 cement Substances 0.000 claims description 6
- 239000011398 Portland cement Substances 0.000 claims description 5
- 229960000583 acetic acid Drugs 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 5
- 238000011049 filling Methods 0.000 claims description 5
- 239000012362 glacial acetic acid Substances 0.000 claims description 5
- 239000011148 porous material Substances 0.000 claims description 5
- 230000001172 regenerating effect Effects 0.000 claims description 5
- 238000004078 waterproofing Methods 0.000 claims 1
- 239000002994 raw material Substances 0.000 abstract description 5
- 238000007493 shaping process Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract description 3
- 238000004064 recycling Methods 0.000 abstract description 3
- 230000015271 coagulation Effects 0.000 description 4
- 238000005345 coagulation Methods 0.000 description 4
- 230000036571 hydration Effects 0.000 description 4
- 238000006703 hydration reaction Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 239000002969 artificial stone Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a preparation method of recycled concrete, which comprises the steps of respectively conveying waste steel slag, pebbles, broken stones and modified diatomite to a crusher for crushing treatment, adding a breaker during crushing, and then mixing the waste steel slag, the pebbles, the broken stones and the modified diatomite to obtain concrete aggregate; a cold water path circulation pipeline is arranged at a processing point, the obtained concrete aggregate is cooled through the cold water path circulation pipeline, and then the concrete aggregate is covered and protected by a heat insulation part for standby; fully mixing the waste concrete with a silicate cement mixer, adding water for synchronous stirring, and adding cooled concrete aggregate during the synchronous stirring. Through carrying out recovery processing with the waste material and recycling, can effectively reduce the influence of waste material to the environment simultaneously, can reduce the use cost of concrete raw materials, realize sustainable development and utilize, can increase the inside use intensity and the shaping effect of concrete.
Description
Technical Field
The invention belongs to the technical field of concrete, and particularly relates to a preparation method of recycled concrete.
Background
Concrete is one of the most prominent civil engineering materials in the current generation; the artificial stone is prepared from cementing material, granular aggregate, water, and optionally additives and admixtures according to a certain proportion by uniformly stirring, compacting, shaping, curing and hardening.
The wall surface concrete used at present is mainly formed by stirring and mixing cement, sand and a small amount of additives, has the defects of easy cracking, falling and acid discharge, hardly meets the requirements of modern building wall surface concrete, is environment-friendly and poor, and can not treat and digest waste materials generated by buildings and industries so as to reduce the influence on the environment. For this purpose, we propose a method for preparing recycled concrete.
Disclosure of Invention
The invention aims to provide a preparation method of recycled concrete, which aims to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions: the preparation method of the recycled concrete comprises 30-40 parts by weight of waste concrete, 20-40 parts by weight of Portland cement, 3-10 parts by weight of waste steel slag, 5-10 parts by weight of pebble, 2-5 parts by weight of broken stone, 2-3 parts by weight of modified diatomite, 1-5 parts by weight of silicone rubber powder, 0.05-0.1 part by weight of water reducer, 0.02-0.05 part by weight of waterproof agent, 0.05-0.08 part by weight of antifreezing agent, 0.02-0.04 part by weight of rust inhibitor, 0.05-0.08 part by weight of accelerator, 0.07-0.1 part by weight of early strength agent, 0.1-0.3 part by weight of organic boron fiber, 0.04-0.08 part by weight of surfactant and 5-15 parts by weight of water;
the preparation method comprises the following specific steps:
step one: respectively conveying the waste steel slag, pebbles, broken stone and modified diatomite to a crusher for crushing treatment, adding a breaker during crushing, and then mixing the waste steel slag, pebbles, broken stone and modified diatomite to obtain concrete aggregate;
step two: a cold water path circulation pipeline is arranged at a processing point, the obtained concrete aggregate is cooled through the cold water path circulation pipeline, and then the concrete aggregate is covered and protected by a heat insulation part for standby;
step three: fully mixing waste concrete with a silicate cement mixer, adding water for synchronous stirring, adding cooled concrete aggregate during the synchronous stirring, adding silicone rubber powder and organic boron fiber after uniform mixing, and adding a water reducing agent and a rust inhibitor after full mixing to obtain a concrete base material;
step four: mixing the waterproof agent, the antifreezing agent, the accelerator, the early strength agent and the surfactant to obtain an additive, and storing the additive for later use;
step five: and (3) conveying the admixture, the waterproof agent, the early strength agent and the concrete base material into a forced concrete mixer for mixing treatment to obtain the recycled concrete.
Further, the waste concrete in the first step is crushed, cleaned and classified in sequence before being used.
Further, the concrete waste after the cleaning and sorting machine is placed in acid liquor, the acid liquor is glacial acetic acid or hydrochloric acid solution, and the acid liquor is utilized to react with Ca (OH) 2 in the concrete waste to play a role in improving the surface of the regenerated aggregate particles, so that the performance of the regenerated aggregate is improved.
Further, after the waste concrete and the silicate cement mixer are fully mixed and water is added in the third step, standing treatment is needed in a dry environment, so that the waste concrete and the silicate cement are fully soaked.
Further, after the mixing and soaking of the waste concrete and the coagulation slurry of the silicate cement are finished, adding a water glass solution for soaking and regenerating, and filling the pores of the regenerated aggregate by using the water glass and the cement hydrate on the surface of the slurry, so that the density of the regenerated aggregate is improved.
Further, the use ratio of the water glass solution to the waste concrete is 10:1.
Further, the recycled concrete needs to be vibrated in advance when being used, and is vibrated by an inserted vibrator, the inserted concrete should be inserted and pulled out quickly and slowly, the inserted concrete should be uniformly arranged, the inserted concrete moves point by point and is sequentially vibrated, so that the recycled concrete is compacted to remove joints between two layers, and then is vibrated by a flat vibrator, and the moving distance should be enough to ensure that a flat plate of the vibrator covers the vibrated edge.
Further, the particle diameter of the concrete aggregate is 1-5cm, the fineness modulus of the silicone rubber powder is 2-2.5, and the fineness modulus of the modified diatomite is preferably 2.2-2.5.
Compared with the prior art, the invention has the beneficial effects that: through carrying out recovery processing with the waste material and recycling, can effectively reduce the influence of waste material to the environment simultaneously, can reduce the use cost of concrete raw materials, realize sustainable development and utilize, can increase the inside use strength of concrete and shaping effect, through carrying out cooling treatment to concrete and raw materials, the production of hydration heat phenomenon in the construction can greatly reduced, can effectively avoid the fracture of wall body, through the additional strengthening to the inside increase of concrete, and stability in use is good, shock resistance is good, can reduce the concrete fracture probability that the hydration temperature rises and lead to.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The preparation method of the recycled concrete comprises 30 parts by weight of waste concrete, 20 parts by weight of Portland cement, 3 parts by weight of waste steel slag, 5 parts by weight of pebbles, 2 parts by weight of broken stone, 2 parts by weight of modified diatomite, 1 part by weight of silicone rubber powder, 0.05 part by weight of water reducer, 0.02 part by weight of waterproof agent, 0.05 part by weight of antifreezing agent, 0.02 part by weight of rust inhibitor, 0.05 part by weight of accelerator, 0.07 part by weight of early strength agent, 0.1 part by weight of organic boron fiber, 0.04 part by weight of surfactant and 5 parts by weight of water;
the preparation method comprises the following specific steps:
step one: respectively conveying the waste steel slag, pebbles, broken stone and modified diatomite to a crusher for crushing treatment, adding a breaker during crushing, and then mixing the waste steel slag, pebbles, broken stone and modified diatomite to obtain concrete aggregate;
step two: a cold water path circulation pipeline is arranged at a processing point, the obtained concrete aggregate is cooled through the cold water path circulation pipeline, and then the concrete aggregate is covered and protected by a heat insulation part for standby;
step three: fully mixing waste concrete with a silicate cement mixer, adding water for synchronous stirring, adding cooled concrete aggregate during the synchronous stirring, adding silicone rubber powder and organic boron fiber after uniform mixing, and adding a water reducing agent and a rust inhibitor after full mixing to obtain a concrete base material;
step four: mixing the waterproof agent, the antifreezing agent, the accelerator, the early strength agent and the surfactant to obtain an additive, and storing the additive for later use;
step five: and (3) conveying the admixture, the waterproof agent, the early strength agent and the concrete base material into a forced concrete mixer for mixing treatment to obtain the recycled concrete.
The waste concrete in the first step is crushed, cleaned and classified in sequence before being used.
The method comprises the steps of placing concrete waste after the cleaning and sorting machine in acid liquor, wherein the acid liquor is glacial acetic acid or hydrochloric acid solution, and reacting the acid liquor with Ca (OH) 2 in the concrete waste to improve the surface of regenerated aggregate particles, so that the performance of the regenerated aggregate is improved.
And thirdly, fully mixing the waste concrete and the silicate cement mixer, adding water, and then carrying out standing treatment in a dry environment to fully soak the waste concrete and the silicate cement.
And after the mixing and soaking of the waste concrete and the coagulation slurry of the silicate cement are finished, adding a water glass solution for soaking and regenerating, and filling the pores of the regenerated aggregate with cement hydrate on the surfaces of the water glass and the slurry, so that the density of the regenerated aggregate is improved.
Wherein the use ratio of the water glass solution to the waste concrete is 10:1.
The regenerated concrete needs to be vibrated in advance when being used, the regenerated concrete is vibrated by the plug-in vibrator, the plug-in vibrator is required to be plugged in and pulled out slowly, plug-in points are required to be uniformly arranged, the plug-in points are required to be moved point by point and are sequentially carried out, the regenerated concrete is vibrated tightly, joints between two layers are removed, the regenerated concrete is vibrated by the flat vibrator, and the moving distance is required to ensure that the flat plate of the vibrator covers the vibrated edges.
Wherein the particle diameter of the concrete aggregate is 1cm, the fineness modulus of the silicone rubber powder is 2-2.5, and the fineness modulus of the modified diatomite is preferably in the range of 2.2.
Example 2
The preparation method of the recycled concrete comprises 35 parts by weight of waste concrete, 30 parts by weight of Portland cement, 6 parts by weight of waste steel slag, 7 parts by weight of pebbles, 3 parts by weight of broken stone, 2.5 parts by weight of modified diatomite, 3 parts by weight of silicone rubber powder, 0.07 part by weight of water reducer, 0.03 part by weight of waterproof agent, 0.06 part by weight of antifreezing agent, 0.03 part by weight of rust inhibitor, 0.07 part by weight of accelerator, 0.09 part by weight of early strength agent, 0.2 part by weight of organic boron fiber, 0.06 part by weight of surfactant and 10 parts by weight of water;
the preparation method comprises the following specific steps:
step one: respectively conveying the waste steel slag, pebbles, broken stone and modified diatomite to a crusher for crushing treatment, adding a breaker during crushing, and then mixing the waste steel slag, pebbles, broken stone and modified diatomite to obtain concrete aggregate;
step two: a cold water path circulation pipeline is arranged at a processing point, the obtained concrete aggregate is cooled through the cold water path circulation pipeline, and then the concrete aggregate is covered and protected by a heat insulation part for standby;
step three: fully mixing waste concrete with a silicate cement mixer, adding water for synchronous stirring, adding cooled concrete aggregate during the synchronous stirring, adding silicone rubber powder and organic boron fiber after uniform mixing, and adding a water reducing agent and a rust inhibitor after full mixing to obtain a concrete base material;
step four: mixing the waterproof agent, the antifreezing agent, the accelerator, the early strength agent and the surfactant to obtain an additive, and storing the additive for later use;
step five: and (3) conveying the admixture, the waterproof agent, the early strength agent and the concrete base material into a forced concrete mixer for mixing treatment to obtain the recycled concrete.
The waste concrete in the first step is crushed, cleaned and classified in sequence before being used.
The method comprises the steps of placing concrete waste after the cleaning and sorting machine in acid liquor, wherein the acid liquor is glacial acetic acid or hydrochloric acid solution, and reacting the acid liquor with Ca (OH) 2 in the concrete waste to improve the surface of regenerated aggregate particles, so that the performance of the regenerated aggregate is improved.
And thirdly, fully mixing the waste concrete and the silicate cement mixer, adding water, and then carrying out standing treatment in a dry environment to fully soak the waste concrete and the silicate cement.
And after the mixing and soaking of the waste concrete and the coagulation slurry of the silicate cement are finished, adding a water glass solution for soaking and regenerating, and filling the pores of the regenerated aggregate with cement hydrate on the surfaces of the water glass and the slurry, so that the density of the regenerated aggregate is improved.
Wherein the use ratio of the water glass solution to the waste concrete is 10:1.
The regenerated concrete needs to be vibrated in advance when being used, the regenerated concrete is vibrated by the plug-in vibrator, the plug-in vibrator is required to be plugged in and pulled out slowly, plug-in points are required to be uniformly arranged, the plug-in points are required to be moved point by point and are sequentially carried out, the regenerated concrete is vibrated tightly, joints between two layers are removed, the regenerated concrete is vibrated by the flat vibrator, and the moving distance is required to ensure that the flat plate of the vibrator covers the vibrated edges.
The particle diameter of the concrete aggregate is 3cm, the fineness modulus of the silicone rubber powder is 2.3, and the fineness modulus of the modified diatomite is preferably in the range of 2.3.
Example 3
The preparation method of the recycled concrete comprises 40 parts by weight of waste concrete, 40 parts by weight of Portland cement, 10 parts by weight of waste steel slag, 10 parts by weight of pebbles, 5 parts by weight of broken stone, 3 parts by weight of modified diatomite, 5 parts by weight of silicone rubber powder, 0.1 part by weight of water reducer, 0.05 part by weight of waterproof agent, 0.08 part by weight of antifreezing agent, 0.04 part by weight of rust inhibitor, 0.08 part by weight of accelerator, 0.1 part by weight of early strength agent, 0.3 part by weight of organic boron fiber, 0.08 part by weight of surfactant and 15 parts by weight of water;
the preparation method comprises the following specific steps:
step one: respectively conveying the waste steel slag, pebbles, broken stone and modified diatomite to a crusher for crushing treatment, adding a breaker during crushing, and then mixing the waste steel slag, pebbles, broken stone and modified diatomite to obtain concrete aggregate;
step two: a cold water path circulation pipeline is arranged at a processing point, the obtained concrete aggregate is cooled through the cold water path circulation pipeline, and then the concrete aggregate is covered and protected by a heat insulation part for standby;
step three: fully mixing waste concrete with a silicate cement mixer, adding water for synchronous stirring, adding cooled concrete aggregate during the synchronous stirring, adding silicone rubber powder and organic boron fiber after uniform mixing, and adding a water reducing agent and a rust inhibitor after full mixing to obtain a concrete base material;
step four: mixing the waterproof agent, the antifreezing agent, the accelerator, the early strength agent and the surfactant to obtain an additive, and storing the additive for later use;
step five: and (3) conveying the admixture, the waterproof agent, the early strength agent and the concrete base material into a forced concrete mixer for mixing treatment to obtain the recycled concrete.
The waste concrete in the first step is crushed, cleaned and classified in sequence before being used.
The method comprises the steps of placing concrete waste after the cleaning and sorting machine in acid liquor, wherein the acid liquor is glacial acetic acid or hydrochloric acid solution, and reacting the acid liquor with Ca (OH) 2 in the concrete waste to improve the surface of regenerated aggregate particles, so that the performance of the regenerated aggregate is improved.
And thirdly, fully mixing the waste concrete and the silicate cement mixer, adding water, and then carrying out standing treatment in a dry environment to fully soak the waste concrete and the silicate cement.
And after the mixing and soaking of the waste concrete and the coagulation slurry of the silicate cement are finished, adding a water glass solution for soaking and regenerating, and filling the pores of the regenerated aggregate with cement hydrate on the surfaces of the water glass and the slurry, so that the density of the regenerated aggregate is improved.
Wherein the use ratio of the water glass solution to the waste concrete is 10:1.
The regenerated concrete needs to be vibrated in advance when being used, the regenerated concrete is vibrated by the plug-in vibrator, the plug-in vibrator is required to be plugged in and pulled out slowly, plug-in points are required to be uniformly arranged, the plug-in points are required to be moved point by point and are sequentially carried out, the regenerated concrete is vibrated tightly, joints between two layers are removed, the regenerated concrete is vibrated by the flat vibrator, and the moving distance is required to ensure that the flat plate of the vibrator covers the vibrated edges.
The particle diameter of the concrete aggregate is 5cm, the fineness modulus of the silicone rubber powder is 2.5, and the fineness modulus of the modified diatomite is preferably in the range of 2.5.
The working principle and the using flow of the invention are as follows: through carrying out recovery processing with the waste material and recycling, can effectively reduce the influence of waste material to the environment simultaneously, can reduce the use cost of concrete raw materials, realize sustainable development and utilize, can increase the inside use strength of concrete and shaping effect, through carrying out cooling treatment to concrete and raw materials, the production of hydration heat phenomenon in the construction can greatly reduced, can effectively avoid the fracture of wall body, through the additional strengthening to the inside increase of concrete, and stability in use is good, shock resistance is good, can reduce the concrete fracture probability that the hydration temperature rises and lead to.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The preparation method of the recycled concrete is characterized by comprising 30-40 parts by weight of waste concrete, 20-40 parts by weight of Portland cement, 3-10 parts by weight of waste steel slag, 5-10 parts by weight of pebble, 2-5 parts by weight of broken stone, 2-3 parts by weight of modified diatomite, 1-5 parts by weight of silicone rubber powder, 0.05-0.1 part by weight of water reducer, 0.02-0.05 part by weight of waterproofing agent, 0.05-0.08 part by weight of antifreezing agent, 0.02-0.04 part by weight of rust inhibitor, 0.05-0.08 part by weight of accelerator, 0.07-0.1 part by weight of early strength agent, 0.1-0.3 part by weight of organic boron fiber, 0.04-0.08 part by weight of surfactant and 5-15 parts by weight of water;
the preparation method comprises the following specific steps:
step one: respectively conveying the waste steel slag, pebbles, broken stone and modified diatomite to a crusher for crushing treatment, adding a breaker during crushing, and then mixing the waste steel slag, pebbles, broken stone and modified diatomite to obtain concrete aggregate;
step two: a cold water path circulation pipeline is arranged at a processing point, the obtained concrete aggregate is cooled through the cold water path circulation pipeline, and then the concrete aggregate is covered and protected by a heat insulation part for standby;
step three: fully mixing waste concrete with a silicate cement mixer, adding water for synchronous stirring, adding cooled concrete aggregate during the synchronous stirring, adding silicone rubber powder and organic boron fiber after uniform mixing, and adding a water reducing agent and a rust inhibitor after full mixing to obtain a concrete base material;
step four: mixing the waterproof agent, the antifreezing agent, the accelerator, the early strength agent and the surfactant to obtain an additive, and storing the additive for later use;
step five: and (3) conveying the admixture, the waterproof agent, the early strength agent and the concrete base material into a forced concrete mixer for mixing treatment to obtain the recycled concrete.
2. The method for preparing recycled concrete according to claim 1, wherein: the waste concrete in the first step is crushed, cleaned and classified in sequence before being used.
3. The method for preparing recycled concrete according to claim 1, wherein: the concrete waste after the cleaning and sorting machine is placed in acid liquor, the acid liquor is glacial acetic acid or hydrochloric acid solution, and the acid liquor is utilized to react with Ca (OH) 2 in the concrete waste to play a role in improving the surface of the regenerated aggregate particles, so that the performance of the regenerated aggregate is improved.
4. The method for preparing recycled concrete according to claim 1, wherein: and thirdly, fully mixing the waste concrete and the silicate cement mixer, adding water, and then carrying out standing treatment in a dry environment to fully soak the waste concrete and the silicate cement.
5. The method for preparing recycled concrete according to claim 4, wherein: and after the mixing and soaking of the waste concrete and the concrete slurry of the silicate cement are finished, adding a water glass solution for soaking and regenerating, and filling the pores of the regenerated aggregate by using the water glass and the cement hydrate on the surface of the slurry, so that the density of the regenerated aggregate is improved.
6. The method for preparing recycled concrete according to claim 5, wherein: the use ratio of the water glass solution to the waste concrete is 10:1.
7. The method for preparing recycled concrete according to claim 1, wherein: the regenerated concrete needs to be vibrated in advance when being used, and is vibrated by an inserted vibrator, the inserted concrete should be quickly inserted and pulled out, the inserted concrete should be uniformly arranged, the concrete should be moved point by point and sequentially carried out, so that the regenerated concrete is vibrated tightly, joints between two layers are removed, the regenerated concrete is vibrated by a flat vibrator, and the moving distance should be capable of ensuring that a flat plate of the vibrator covers the vibrated edge.
8. The method for preparing recycled concrete according to claim 1, wherein: the particle diameter of the concrete aggregate is 1-5cm, the fineness modulus of the silicone rubber powder is 2-2.5, and the fineness modulus of the modified diatomite is preferably 2.2-2.5.
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| CN202210487751.5A CN117049837A (en) | 2022-05-06 | 2022-05-06 | Preparation method of recycled concrete |
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