CN111592288B - Preparation process of recycled aggregate concrete and concrete prepared by preparation process - Google Patents
Preparation process of recycled aggregate concrete and concrete prepared by preparation process Download PDFInfo
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- CN111592288B CN111592288B CN202010446168.0A CN202010446168A CN111592288B CN 111592288 B CN111592288 B CN 111592288B CN 202010446168 A CN202010446168 A CN 202010446168A CN 111592288 B CN111592288 B CN 111592288B
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- 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
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- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
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- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
- C04B20/1066—Oxides, Hydroxides
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- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention discloses a preparation process of recycled aggregate concrete and the prepared concrete, relating to the technical field of concrete preparation; a preparation process of recycled aggregate concrete comprises the following steps: s1 aggregate crushing: taking concrete construction slag, and crushing to obtain construction slag powder; s2 aggregate pretreatment: taking slag building powder, adding silica sol, uniformly mixing, standing for aging, and drying to prepare recycled aggregate dry powder; s3 mixing: weighing a certain amount of fly ash, coarse aggregate, fine aggregate and zeolite powder, and uniformly mixing to prepare concrete powder; s4 concrete preparation: adding a certain amount of water into the recycled aggregate dry powder, stirring, adding cement and a water reducing agent, adding concrete powder, and continuously stirring to prepare a recycled aggregate concrete product; the preparation process of the recycled aggregate concrete has the advantage of improving the crack resistance of the product conveniently; the recycled aggregate concrete has the advantage of good crack resistance.
Description
Technical Field
The invention relates to the technical field of building material production, in particular to a preparation process of recycled aggregate concrete and the prepared concrete.
Background
The concrete is a high-strength building material produced by using materials such as sand, gravel, cement and the like as raw materials, and is widely used in the fields of road construction, high-rise buildings and the like due to the advantages of high strength, good plasticity, durability and the like. With the rapid development of economic society, some waste buildings need to be dismantled and modified to generate a large amount of construction waste, so that certain challenges are brought to environmental protection treatment, and the research of using the construction waste regeneration treatment for preparing recycled aggregate concrete is increasing.
The patent with the publication number of CN106431106B discloses recycled concrete produced by using recycled aggregate, which comprises the following raw materials in percentage by mass: 37-55% of regenerated coarse aggregate, 17-37% of regenerated fine aggregate, 15-22% of P.O.42.5 cement and 8-12% of water; the preparation method of the regenerated coarse aggregate and the fine aggregate in the technical scheme comprises the following steps: the construction waste is sorted, concrete waste and brick waste in the construction waste are collected respectively, then the concrete waste and the brick waste are crushed and screened respectively, and then the concrete waste and the brick waste in the same particle size range are mixed (the recycled coarse aggregate continues to mix coarse aggregates in different particle size ranges), wherein the mass percentage of the concrete waste is not more than 30%. According to the technical scheme, the concrete waste and the brick waste are respectively crushed and screened to prepare the recycled coarse aggregate and the recycled fine aggregate, and the recycled coarse aggregate and the recycled fine aggregate are prepared into recycled concrete, so that the recycling of the construction waste is realized.
However, according to the technical scheme, the concrete waste and the brick waste are respectively subjected to crushing treatment, and because a certain amount of hardened cement mortar is contained in the concrete waste, microcracks are easily generated in the hardened cement mortar in the crushing process of the concrete waste, so that the porosity is increased, the concrete is easy to crack, and the anti-cracking performance of the concrete is damaged.
Disclosure of Invention
In view of the disadvantages of the prior art, the first object of the present invention is to provide a recycled aggregate concrete preparation process facilitating improvement of crack resistance, which has the advantage of facilitating improvement of product crack resistance.
The second purpose of the invention is to provide recycled aggregate concrete with good crack resistance, which has the advantage of good crack resistance.
In order to achieve the first object, the invention provides the following technical scheme: a preparation process of recycled aggregate concrete comprises the following steps:
s1 aggregate crushing: taking concrete construction slag, and crushing to obtain construction slag powder;
s2 aggregate pretreatment: adding silica sol with the mass concentration of 20-50% of silicon dioxide (the balance being water) into the construction slag powder, uniformly mixing, standing and aging for not less than 60min to prepare construction slag wet powder, and drying the construction slag wet powder at 60-90 ℃ for not less than 150min to prepare recycled aggregate dry powder;
s3 mixing: weighing a certain amount of fly ash, coarse aggregate, fine aggregate and zeolite powder, and uniformly mixing to prepare concrete powder;
s4 concrete preparation: adding a certain amount of water into the recycled aggregate dry powder, stirring at the rotating speed of 300-700 rpm, adding cement and a water reducing agent, continuing to stir for 2-5 min, adding concrete powder, and continuing to stir for 3-6 min to prepare a recycled aggregate concrete product;
the materials are fed according to the following weight portion: 1100 parts of slag building powder, 150 parts of silica sol, 150 parts of fly ash, 750 parts of coarse aggregate, 500 parts of fine aggregate, 80-120 parts of zeolite powder, 480 parts of cement, 10-15 parts of water reducing agent and 300 parts of water.
By adopting the technical scheme, in the process of crushing the concrete construction slag into the construction slag powder, a certain amount of microcracks are generated in the hardened and failed cement mortar on the concrete construction slag, silica sol containing a large amount of nano colloidal particles is added into the construction slag powder, the colloidal particles in the silica sol are filled in the microcracks, and then the water in the wet construction slag powder is evaporated and removed from the construction slag powder through drying, so that the nano colloidal particles are agglomerated, the agglomerated colloidal particles have high hardness and can generate certain viscosity and flexibility, the microcracks are repaired, the porosity is reduced, the probability of cracking of the concrete is reduced, and the cracking resistance of the recycled aggregate concrete is improved.
Preferably, the materials are fed according to the following weight portion: 1050 parts of slag building powder, 950 parts of silica sol, 140 parts of silica sol, 100 parts of fly ash, 750 parts of coarse aggregate, 400 parts of fine aggregate, 90-110 parts of zeolite powder, 460 parts of cement, 8-10 parts of water reducing agent and 290 parts of water.
By adopting the technical scheme, the recycled aggregate concrete has the advantages that the better raw material proportion is used, the anti-cracking performance of the recycled aggregate concrete is improved, the market competitiveness of products is improved, and the market value of the products is improved.
Preferably, the silica sol is neutral silica sol, and the particle size of the silica sol is 20nm-50 nm.
By adopting the technical scheme, the silica sol with the proper particle size is used, and the silica sol contains colloidal particles with the proper particle size, so that the silica sol generates a colloidal copolymer with proper strength, flexibility and viscosity in the drying process during the aggregate pretreatment of the step S2, and the crack resistance of the recycled aggregate concrete is improved.
Preferably, the water reducing agent is a polycarboxylic acid water reducing agent.
By adopting the technical scheme, the high-efficiency polycarboxylic acid water reducing agent is used in the preparation process of the recycled aggregate concrete, so that the adjustment of the viscosity and the rheological property of the recycled aggregate concrete is facilitated, the crack resistance of the recycled aggregate concrete is improved, the market competitiveness of products is improved, and the market value of the products is improved.
Preferably, the step S1 includes the following steps:
S1A slag building and refining: taking concrete construction slag, and crushing to obtain construction slag particles;
S1B acid treatment: adding 2-5 times of hydrochloric acid solution with hydrogen chloride mass concentration of 1-5% (the rest is water) into the building slag particles, soaking for 3-10 h, filtering, washing with water until pH is 5-7, and drying at 70 deg.C or higher for not less than 120min to obtain building slag powder.
By adopting the technical scheme, the construction slag particles are acidified by using the dilute hydrochloric acid solution, so that the hardened and ineffective cement mortar surface on the construction slag particles becomes rough, the adhesion strength between the construction slag powder and other raw materials in the recycled aggregate concrete is improved, and the crack resistance of the recycled aggregate concrete is improved.
Preferably, the step S4 includes the following steps:
S4A ball milling of aggregate: adding a certain amount of water into the recycled aggregate dry powder, stirring uniformly, transferring into a ball mill, and ball-milling for 10min-20min by the ball mill at the rotating speed of 10 rpm-20 rpm to prepare recycled slurry;
S4B concrete mixing: transferring the recycled slurry into a stirrer, stirring at the rotating speed of 300-700 rpm, adding cement and a water reducing agent, continuing to stir for 2-5 min, adding concrete powder, and continuing to stir for 3-6 min to obtain a recycled aggregate concrete product.
By adopting the technical scheme, edges and corners are easy to generate in the crushing process of the concrete construction slag, the shapes of part of the edges and corners in the recycled aggregate dry powder are changed by aggregate ball milling, so that other small particle components in the recycled aggregate concrete are easier to distribute among particles of the recycled aggregate dry powder, the adhesive strength between other raw materials in the recycled aggregate concrete and the particles of the recycled aggregate dry powder is improved, and the crack resistance of the recycled aggregate concrete is improved.
Preferably, the ball mill contains 2-5 times of zirconium balls by weight of the dry powder of the recycled aggregate, the median particle size of the zirconium balls is 40-50 mm, and the particle size of the slag building powder is 2-15 mm.
By adopting the technical scheme, the zirconium balls with large particle size and the slag building powder with smaller particle size are used, so that the zirconium balls can be conveniently separated from the regenerated slurry, the process cost is reduced, the market competitiveness of the product is improved, and the market value of the product is improved.
Preferably, the particle size of the coarse aggregate is 5mm-25mm, the particle size of the fine aggregate is 0.1mm-5mm, the particle size of the fly ash is 50 μm-150 μm, and the particle size of the zeolite powder is 120 μm-250 μm.
By adopting the technical scheme, the recycled concrete raw materials with different particle sizes are used and compounded, so that small-particle-size particles are more easily and uniformly distributed among large-particle-size particles, the bonding strength among different raw materials of recycled concrete is improved, the compressive strength and the crack resistance of a product are improved, the product competitiveness is improved, and the product market value is improved.
In order to achieve the second object, the invention provides the following technical scheme: the recycled concrete is prepared by the preparation process of the recycled aggregate concrete.
By adopting the technical scheme, the recycled aggregate concrete product prepared by the preparation process of the recycled aggregate concrete disclosed by the invention is beneficial to improving the crack resistance of concrete, prolonging the service life of the concrete, improving the product competitiveness and improving the product market value.
In summary, the invention includes at least one of the following beneficial technical effects:
1. according to the invention, by adding the silica sol aqueous solution containing nano colloidal particles into the building slag powder, microcracks are easily generated in the process of crushing concrete building slag, and the colloidal particles in the silica sol are agglomerated in the process of pre-drying aggregate, so that a copolymer with certain strength, flexibility and viscosity is formed and filled into the microcracks, the microcracks are repaired, the porosity of the recycled aggregate concrete is reduced, the probability of cracking of the concrete is reduced, and the cracking resistance of the recycled concrete is improved;
2. according to the invention, the roughness of the surface of the hardened cement mortar on the construction slag powder is improved through acid treatment, the adhesive strength between the construction slag powder and other components in the recycled aggregate concrete is improved, and the anti-cracking performance of the recycled concrete is further improved; according to the invention, the shape of the corner in the recycled aggregate dry powder is changed through aggregate ball milling, so that other small particle components in the recycled aggregate concrete are more easily distributed among the particles of the recycled aggregate dry powder, the bonding strength between other raw materials in the recycled aggregate concrete and the particles of the recycled aggregate dry powder is improved, and the crack resistance of the recycled aggregate concrete is improved;
3. according to the invention, the recycled concrete raw materials with different particle sizes are used and compounded, so that small-particle-size particles are more easily and uniformly distributed among large-particle-size particles, the bonding strength among different raw materials of recycled concrete is improved, the compressive strength and the crack resistance of a product are improved, the competitiveness of the product is improved, and the market value of the product is improved.
Detailed Description
Examples
The raw materials related to the invention are all commercially available, and the types and sources of part of the raw materials are shown in table 1.
TABLE 1 Specification, type and origin of the raw materials
| Name of raw materials | Specification and model | Place of manufacture/manufacturer |
| Silica sol | Customization | SHANDONG PEAK-TECH NEW MATERIAL Co.,Ltd. |
| Fly ash | Second stage | Chengdu City Junrui building materials Co Ltd |
| Zeolite powder | First stage | Xinyang industrial city co-creation bentonite factory |
| Cement | PO42.5 | All of Sichuan |
| Polycarboxylic acid water reducing agent | Water-reducing type-I | Chengdu concrete king building materials Co Ltd |
| Zirconium ball | Customization | Shandong Yubang energy saving technology Co., Ltd |
The raw materials used in the invention, such as hydrochloric acid, coarse aggregate, fine aggregate and construction slag, are all produced from Sichuan.
Example 1: a preparation process of recycled aggregate concrete comprises the following steps:
s1, crushing the aggregate, wherein the crushing of the aggregate comprises the following steps: S1A slag building and refining: taking 1100Kg of concrete construction slag, crushing the concrete construction slag by a crusher, sieving the concrete construction slag by using sieves with the hole diameters of 2mm and 15mm respectively, continuously crushing powder with larger particles until the particle size is not more than 15mm, and selecting particles with the particle size of 2mm-15mm to prepare construction slag particles; S1B acid treatment: preparing hydrochloric acid solution with the hydrogen chloride mass concentration of 2% (the balance being water) by taking concentrated hydrochloric acid with the hydrogen chloride mass concentration of 36.5% and water, adding 4400Kg of hydrochloric acid solution with the hydrogen chloride mass concentration of 2% (the balance being water) into the building slag particles, uniformly stirring, soaking for 7h, filtering, washing with water until the pH value is 6, and drying at 70 ℃ for 150min to obtain building slag powder.
S2 aggregate pretreatment: and (2) adding 120Kg of silica sol (the particle size of the silica sol is 20-30 nm, provided by Shandong Baite New Material Co., Ltd., and the particle size and the concentration of the silica sol are customized from Shandong Baite New Material Co., Ltd.) with the mass concentration of 30% of silica (the balance is water) into 1000Kg of the construction slag powder prepared in the step S1, uniformly mixing, standing and aging for 60min to prepare construction slag wet powder, and drying the construction slag wet powder at 70 ℃ for not less than 180min to prepare the recycled aggregate dry powder.
S3 mixing: sieving fly ash with screens with pore diameters of 50 μm and 150 μm respectively, pulverizing fly ash with larger particles with a pulverizer until the particles are not more than 150 μm, and selecting particles with particle diameters of 50 μm-150 μm. Sieving the coarse aggregate with screens with the aperture diameters of 5mm and 25mm respectively, pulverizing the coarse aggregate with larger particles with a pulverizer until the particle diameter is not more than 25mm, and selecting the particles with the particle diameter of 5mm-25 mm. Sieving fine aggregate with screens with aperture diameters of 0.1mm and 5mm respectively, pulverizing the fine aggregate with larger particles with a pulverizer until the particle diameter is not more than 5mm, and selecting the particles with particle diameter of 0.1mm-5 mm. Sieving zeolite powder with 120 μm and 250 μm sieve, respectively, pulverizing the zeolite powder with larger particles with pulverizer until the particle size is not more than 250 μm, and selecting particles with particle size of 120 μm-250 μm. 130Kg of fly ash, 700Kg of coarse aggregate, 450Kg of fine aggregate and 100Kg of zeolite powder are weighed and mixed uniformly to prepare the concrete powder.
S4 concrete preparation, wherein the concrete preparation comprises the following steps: S4A ball milling of aggregate: adding 270Kg of water into the regenerated aggregate dry powder, stirring uniformly, transferring into a ball mill, wherein the ball mill contains 2500Kg of zirconium balls with the median particle size of 45mm, and carrying out ball milling for 15min at the rotating speed of 15 r/min by the ball mill to prepare regenerated slurry; S4B concrete mixing: transferring the recycled slurry into a stirrer, stirring at the rotating speed of 500 revolutions per minute, adding 450Kg of cement and 12Kg of polycarboxylic acid water reducing agent, continuing to stir for 3min, adding concrete powder, and continuing to stir for 4min to prepare a recycled aggregate concrete product.
Example 2
The difference between the example 2 and the example 1 is that the slag building particles of the example 2 are not subjected to the acid treatment process, and the slag building powder is prepared by drying the slag building particles at 70 ℃ for 150min in the example 2, and the rest is consistent with the example 1.
Example 3
Example 3 differs from example 1 in that in example 3 zeolite powder was sieved through sieves with a pore size of 500 μm and 900 μm respectively, zeolite powder with larger particles was crushed with a crusher until the particles were not larger than 900 μm, zeolite powder with a particle size of 500 μm to 900 μm was selected, and the rest was in accordance with example 1.
Examples 4 to 11
Examples 4 to 11 differ from example 1 in the amounts of the starting materials added and the process parameters of examples 4 to 11.
The amounts of the starting materials used in examples 4 to 11 are shown in Table 2, and the process parameters for examples 4 to 11 are shown in Table 3.
TABLE 2 addition of the starting materials of examples 4 to 11
TABLE 3 parameters in the procedure of examples 4-11
Comparative example
Comparative example 1
The difference between the comparative example 1 and the example 1 is that no silica sol is added in the comparative example 1, the slag building powder in the comparative example 1 is not subjected to an aggregate pretreatment procedure, the recycled slurry in the comparative example 1 is not subjected to an aggregate ball milling procedure, water is added into the slag building powder in the comparative example 1, stirring is carried out at the rotating speed of 500 rpm, cement and a water reducing agent are added, stirring is continued for 3min, concrete powder is added, stirring is continued for 6min, and a recycled aggregate concrete product is prepared, wherein the other steps are consistent with those in the example 1.
Comparative example 2
Comparative example 2 differs from example 1 in that comparative example 2 replaces silica sol with 40Kg of solid chromatographic silica gel (80 mesh to 120 mesh, available from Qingdao great silica gel technologies, Inc.), all of which are consistent with example 1.
Performance detection
The recycled aggregate concrete products prepared in examples 1 to 11 and comparative examples 1 to 2 were subjected to compressive strength tests, standard test blocks were prepared according to GB/T50081-2002 Standard for testing mechanical Properties of ordinary concrete, and the compressive strength of the standard test blocks after 28 days of curing was measured, and the test results are shown in Table 4. The concrete sample is made into a cylindrical sample piece with the diameter of 150mm according to the method in appendix A of GB/T50081-2002 Standard test methods for mechanical properties of ordinary concrete, the splitting tensile strength test is carried out according to the method in appendix D of GB/T50081-2002 Standard test methods for mechanical properties of ordinary concrete, the splitting tensile strength of the recycled aggregate concrete sample is calculated, and the test results are shown in Table 4.
TABLE 4 comparison table of compression strength test results of different recycled aggregate concrete products
| Sample numbering | Compressive strength (MPa) | Tensile strength at cleavage (N/mm)2) |
| Example 1 | 52.6 | 2.77 |
| Example 2 | 46.5 | 2.14 |
| Example 3 | 48.1 | 2.21 |
| Example 4 | 50.3 | 2.63 |
| Example 5 | 49.7 | 2.62 |
| Example 6 | 50.8 | 2.59 |
| Example 7 | 49.4 | 2.57 |
| Example 8 | 52.9 | 2.78 |
| Example 9 | 52.4 | 2.75 |
| Example 10 | 53.2 | 2.76 |
| Example 11 | 51.8 | 2.78 |
| Comparative example 1 | 34.6 | 1.23 |
| Comparative example 2 | 37.3 | 1.36 |
Compared with the prior art, the silica sol is not added into the concrete sample in the comparative example 1, the slag building powder in the comparative example 1 is not subjected to an aggregate pretreatment procedure, and the recycled slurry in the comparative example 1 is not subjected to an aggregate ball milling procedure, so that the prepared concrete sample has low splitting tensile strength and compressive strength and poor crack resistance. Comparative example 2 solid chromatographic silica gel is used to replace liquid silica gel, and the prepared concrete sample has both high compressive strength and high splitting tensile strength, and poor crack resistance, and is not favorable for market popularization of products. Comparing the experimental results of example 1 and comparative examples 1-2, it can be seen that, in the process of preparing the recycled aggregate concrete, the liquid nano silica sol is added into the slag-building powder, then the aggregate pretreatment is performed to make the nano colloidal particles in the silica sol agglomerate in the microcracks of the slag-building powder to form a copolymer with certain strength, flexibility and viscosity, and then the angle shape in the recycled aggregate dry powder is changed by ball milling, so that the compressive strength and the crack resistance of the recycled aggregate concrete are remarkably improved.
Compared with the experimental results of the embodiment 1 and the embodiment 2, the slag-building particles of the embodiment 2 are not subjected to the acid treatment process, so that the tensile strength and the compressive strength of the prepared recycled aggregate concrete sample are reduced, the crack resistance is weakened, and the market popularization of the product is not facilitated. Compared with the experimental results of the embodiment 1 and the embodiment 3, the embodiment 3 uses the zeolite powder with larger particle size, the splitting tensile strength and the compressive strength of the prepared recycled aggregate concrete sample are reduced, the crack resistance is weakened, and the market popularization of the product is not facilitated. Therefore, the preferable scheme of the invention is that the acid treatment is carried out on the slag building particles, and the concrete raw material with proper particle size is selected.
The raw materials of examples 4 to 11 were added in different amounts and the process parameters were different from those of example 1. Wherein the weight ratio of the raw materials of the embodiments 8-11 is as follows: 1100 parts of slag building powder, 150 parts of silica sol, 150 parts of fly ash, 750 parts of coarse aggregate, 500 parts of fine aggregate, 80-120 parts of zeolite powder, 480 parts of cement, 10-15 parts of water reducing agent and 300 parts of water, 250; the recycled aggregate concrete products prepared in examples 8 to 11 have excellent compression resistance and crack resistance and strong market competitiveness. The weight ratio of the raw materials in examples 4 to 7 is different from that in examples 8 to 11, and the compressive strength of the prepared recycled aggregate concrete product is slightly reduced, and the crack resistance is slightly reduced. Therefore, the preferable weight ratio of the raw materials is as follows: 1100 parts of slag building powder, 150 parts of silica sol, 150 parts of fly ash, 750 parts of coarse aggregate, 500 parts of fine aggregate, 80-120 parts of zeolite powder, 480 parts of cement, 10-15 parts of water reducing agent and 300 parts of water.
The coarse aggregate used by the invention is rock particles with the particle size of 5mm-25mm, which are prepared by crushing and screening natural rocks, the fine aggregate used by the invention is aggregate with the particle size of 0.1mm-5mm, which is prepared by crushing and screening river sand, and the concrete construction slag used by the invention is a construction slag material which is obtained by crushing and deironing waste materials generated by concrete construction.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (9)
1. The preparation process of the recycled aggregate concrete is characterized by comprising the following steps of:
s1 aggregate crushing: taking concrete construction slag, and crushing to obtain construction slag powder;
s2 aggregate pretreatment: adding silica sol with the mass concentration of 20-50% of silicon dioxide into the construction slag powder, uniformly mixing, standing and aging for not less than 60min to prepare construction slag wet powder, and drying the construction slag wet powder at 60-90 ℃ for not less than 150min to prepare recycled aggregate dry powder;
s3 mixing: weighing a certain amount of fly ash, coarse aggregate, fine aggregate and zeolite powder, and uniformly mixing to prepare concrete powder;
s4 concrete preparation: adding a certain amount of water into the recycled aggregate dry powder, stirring at the rotating speed of 300-700 rpm, adding cement and a water reducing agent, continuing to stir for 2-5 min, adding concrete powder, and continuing to stir for 3-6 min to prepare a recycled aggregate concrete product;
the materials are fed according to the following weight portion: 1100 parts of slag building powder, 150 parts of silica sol, 150 parts of fly ash, 750 parts of coarse aggregate, 500 parts of fine aggregate, 80-120 parts of zeolite powder, 480 parts of cement, 10-15 parts of water reducing agent and 300 parts of water.
2. The preparation process of the recycled aggregate concrete according to claim 1, wherein the materials are fed according to the following weight ratio: 1050 parts of slag building powder, 950 parts of silica sol, 140 parts of silica sol, 100 parts of fly ash, 750 parts of coarse aggregate, 400 parts of fine aggregate, 90-110 parts of zeolite powder, 460 parts of cement, 10-15 parts of water reducing agent and 290 parts of water.
3. The preparation process of recycled aggregate concrete according to claim 2, wherein the concrete is prepared by the following steps: the silica sol is neutral silica sol, and the particle size of the silica sol is 20nm-50 nm.
4. The preparation process of recycled aggregate concrete according to claim 2, wherein the concrete is prepared by the following steps: the water reducing agent is a polycarboxylic acid water reducing agent.
5. The preparation process of recycled aggregate concrete according to claim 2, wherein the step S1 comprises the steps of:
S1A slag building and refining: taking concrete construction slag, and crushing to obtain construction slag particles;
S1B acid treatment: adding 2-5 times of hydrochloric acid solution with hydrogen chloride mass concentration of 1-5% into the building slag particles, soaking for 3-10 h, filtering, washing with water until pH is 5-7, and drying at 70 deg.C for not less than 120min to obtain building slag powder.
6. The preparation process of recycled aggregate concrete according to claim 2, wherein the step S4 comprises the steps of:
S4A ball milling of aggregate: adding a certain amount of water into the recycled aggregate dry powder, stirring uniformly, transferring into a ball mill, and ball-milling for 10min-20min by the ball mill at the rotating speed of 10 rpm-20 rpm to prepare recycled slurry;
S4B concrete mixing: transferring the recycled slurry into a stirrer, stirring at the rotating speed of 300-700 rpm, adding cement and a water reducing agent, continuing to stir for 2-5 min, adding concrete powder, and continuing to stir for 3-6 min to obtain a recycled aggregate concrete product.
7. The preparation process of recycled aggregate concrete according to claim 6, wherein the concrete is prepared by the following steps: the ball mill contains 2-5 times of zirconium balls by weight of the dry powder of the recycled aggregate, the median particle size of the zirconium balls is 40-50 mm, and the particle size of the slag building powder is 2-15 mm.
8. The preparation process of recycled aggregate concrete according to claim 7, wherein the concrete is prepared by the following steps: the particle size of the coarse aggregate is 5-25 mm, the particle size of the fine aggregate is 0.1-5 mm, the particle size of the fly ash is 50-150 mu m, and the particle size of the zeolite powder is 120-250 mu m.
9. A recycled concrete characterized by: the recycled aggregate concrete prepared by the preparation process of any one of claims 1 to 8.
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| CN111574149B (en) * | 2020-05-11 | 2021-10-22 | 杭州汉特建材有限公司 | Recycled concrete and preparation method thereof |
| CN112159195B (en) * | 2020-10-09 | 2022-02-22 | 四川宏量基筑建材有限公司 | Method for preparing aerated concrete by utilizing recycled concrete aggregate and aerated concrete |
| CN112250374B (en) * | 2020-11-05 | 2022-07-01 | 四川鼎德商品混凝土有限公司 | Recycled concrete and preparation method thereof |
| CN114953151A (en) * | 2022-06-14 | 2022-08-30 | 安徽正一建筑工程有限公司 | Concrete preparation production line based on building rubbish is recycled |
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| US20040187740A1 (en) * | 2003-03-27 | 2004-09-30 | Research Incubator, Ltd. | Cementitious composition |
| CN101265061A (en) * | 2008-04-24 | 2008-09-17 | 中鑫建设集团有限公司 | Concrete perforated brick and manufacturing method thereof |
| CN105130299A (en) * | 2015-08-20 | 2015-12-09 | 浙江工业大学 | In-situ reinforcement method of recycled aggregate |
| CN106623379B (en) * | 2016-11-04 | 2020-04-07 | 甘肃天农一禾农业有限公司 | Resource recycling method of construction waste and heavy metal contaminated soil remediation agent |
| CN110041028A (en) * | 2019-04-26 | 2019-07-23 | 四川衡鼎建材有限公司 | A kind of regeneration concrete and preparation method thereof using building waste |
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