CN113716903B - Sponge city high-strength recycled aggregate concrete and preparation method thereof - Google Patents
Sponge city high-strength recycled aggregate concrete and preparation method thereof Download PDFInfo
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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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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
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- 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
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00008—Obtaining or using nanotechnology related materials
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- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- 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
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention provides a sponge city high-strength recycled aggregate concrete and a preparation method thereof. The sponge city high-strength recycled aggregate concrete and the preparation method thereof comprise the following raw materials in parts by weight: 600-800 parts of reinforced recycled coarse aggregate, 400-600 parts of cement and 100-200 parts of water. According to the sponge city high-strength recycled aggregate concrete and the preparation method thereof, the physical property and the mechanical property of the concrete are further improved by adding the modified reinforcing agent, the strength of the recycled aggregate can be effectively improved, meanwhile, the polyvinyl alcohol in the interior can permeate into the recycled coarse aggregate, the pores and cracks of the recycled coarse aggregate are filled, a film is formed to cover the surface pores of the recycled coarse aggregate, an effective protective effect is achieved on the recycled aggregate, the recycled aggregate is not easy to be influenced by external environment, and meanwhile, the connection among raw materials can be enhanced, so that the concrete has stable and durable compressive strength, wear resistance, freezing resistance and deformation resistance, and is better adapted to the environment with high pressure.
Description
Technical Field
The invention relates to the field of building materials, in particular to sponge city high-strength recycled aggregate concrete and a preparation method thereof.
Background
The sponge city is a new generation city rain and flood management concept, and the city can be like a sponge, has good elasticity in the aspects of adapting to environmental changes, dealing with natural disasters caused by rainwater and the like, and can also be called as a 'water elasticity city', absorbs water, stores water, permeates water and purifies water when raining, and releases and utilizes the stored water when needed so as to realize free migration of the rainwater in the city. From the ecological system service, the construction of the water ecological infrastructure through the trans-scale construction and the combination of various specific technologies is the core of the sponge city.
The sponge urban material is applied substantially, and has the characteristics of excellent water seepage, compression resistance, wear resistance, skid resistance, environmental protection, attractive appearance, comfort, easy maintenance, sound absorption, noise reduction and the like, such as common environment-friendly recycled aggregate concrete, has high-efficiency water seepage and drainage functions after paving urban roads and squares, and promotes the recycling of solid wastes through recycling construction wastes, thereby having good environment protection and resource saving effects.
In the related art, the recycled aggregate concrete for sponge cities has a plurality of types, and has different functions according to different use environments, and for the concrete applied to the environment with larger pressure for a long time, the recycled aggregate inside the concrete has uneven quality and layering, and the whole physical performance is not stable enough, so that the obvious reduction of the performances such as compression resistance, freezing resistance, wear resistance and the like easily occurs after the concrete is used for a long time, the cracking or collapse of the construction surface is caused, and the construction requirement cannot be well met.
Therefore, it is necessary to provide a sponge city high-strength recycled aggregate concrete and a preparation method thereof to solve the technical problems.
Disclosure of Invention
The invention provides a high-strength recycled aggregate concrete for a sponge city and a preparation method thereof, which solve the problem that the performance of the recycled aggregate concrete is obviously reduced after long-time use.
In order to solve the technical problems, the sponge city high-strength recycled aggregate concrete and the preparation method thereof provided by the invention comprise the following raw materials in parts by weight:
600-800 parts of reinforced recycled coarse aggregate, 400-600 parts of cement, 100-200 parts of water, 50-100 parts of steel slag powder, 35-70 parts of limestone powder, 30-60 parts of nano silicon dioxide, 20-40 parts of graphene oxide powder, 15-30 parts of polyacrylate, 10-15 parts of water glass, 5-10 parts of water reducer, 4-8 parts of super absorbent resin and 6-12 parts of modified reinforcing agent;
wherein the modified reinforcing agent comprises the following raw materials in parts by weight:
15-20 parts of nano calcium carbonate, 12-18 parts of polyvinyl alcohol, 8-12 parts of diboron trioxide, 4-8 parts of amino trimethylene phosphonate, 0.8-1.2 parts of coupling agent and 10-20 parts of water;
the preparation method of the modified reinforcing agent comprises the following operation steps:
s1, uniformly mixing polyvinyl alcohol and diboron trioxide, heating to 30-40 ℃, adding nano calcium carbonate, and continuously stirring for 20-30 minutes to obtain a blend;
s2, dividing the amino trimethylene phosphonate into three equal parts, sequentially adding the three equal parts into a coupling agent, stirring in the same direction, adding water with the same amount after adding one part of amino trimethylene phosphonate each time, standing for 5-10 minutes, continuously adding the next part of amino trimethylene phosphonate until the addition of the amino trimethylene phosphonate is completed, and cooling for 2-5 minutes to obtain a mixed solution;
and S3, adding the mixed solution obtained in the step S2 into the blend obtained in the step S1, uniformly stirring and mixing, heating to 80-90 ℃ in a water bath, adding the rest water, slowly stirring, continuously stirring for 5-10 minutes, stopping heating, and taking out and cooling to obtain the modified reinforcing agent.
Preferably, 600 parts of reinforced recycled coarse aggregate, 400 parts of cement, 100 parts of water, 50 parts of steel slag powder, 35 parts of limestone powder, 30 parts of nano silicon dioxide, 20 parts of graphene oxide powder, 15 parts of polyacrylate, 10 parts of water glass, 5 parts of water reducer, 4 parts of super absorbent resin and 6 parts of modified reinforcing agent.
Preferably, the average grain size of the steel slag powder is 3.25-4.37mm, and the average grain size of the limestone powder is 2.64-3.82 mu m.
Preferably, the water reducer adopts a polycarboxylic acid type high-efficiency water reducer, the water reducing rate of the water reducer is 20-25%, and the super absorbent resin is any one or a plurality of compositions of polyacrylate, starch acrylate polymer and starch-acrylonitrile grafting copolymer.
Preferably, the concentration of the water glass is 40-45wt%, and the concentration of the polyvinyl alcohol is 30-36wt%.
The preparation method of the sponge city high-strength recycled aggregate concrete comprises the following operation steps:
s1, treating recycled aggregate: firstly, breaking up waste concrete blocks to blocks with the diameter length smaller than 60mm, and then sequentially carrying out the processes of spraying, screening, crushing, strengthening and drying collection on the block-shaped concrete to finally obtain the strengthening recycled aggregate with the average particle size of 5-8 mm;
s2, placing cement, steel slag powder and limestone powder into a high-speed mixer, pre-stirring for 2-5 minutes to uniformly mix the raw materials, then slowly adding water which is half of the total volume of the mixture, and continuously stirring for 15-20 minutes to obtain a mixture A;
s3, uniformly mixing nano silicon dioxide, graphene oxide powder and a half of polyacrylate, heating to 55-60 ℃, adding water with a half of the total volume, continuously stirring until the temperature rises to 75-80 ℃, stopping heating, continuously adding the rest half of polyacrylate, continuously stirring for 5-10 minutes, standing, and cooling to a normal temperature state to obtain a mixed solution;
s4, sequentially adding the super absorbent resin, the modified reinforcing agent and the rest of water into a soaking device, stirring to uniformly mix the super absorbent resin, the modified reinforcing agent and the rest of water, adding the mixture A obtained in the S1, soaking the mixture A for 2-3 hours, and filtering the solution to obtain a mixture B;
and S5, adding the mixed solution obtained in the step S3 and the mixture B obtained in the step S4 into a stirring device, continuously stirring for 10-15 minutes, sequentially adding water glass and a water reducer, and continuously stirring for 25-30 minutes to obtain the required high-strength recycled aggregate concrete.
Preferably, the strengthening treatment of the aggregate in S1 includes the following steps:
s1, slowly adding water glass into nano calcium carbonate, fully stirring and mixing to obtain a mixture, continuously adding water with the volume being 2-4 times that of the mixture, uniformly mixing, and standing for 3-5 hours;
s2, adding concrete particles into the mixture obtained in the step S1, fully stirring and mixing, adding water with a half of the total volume again, fully mixing, soaking for 3-4 hours under the negative pressure of 0.3-0.5MPa, and filtering to obtain a solid mixture;
s3, placing the solid mixture obtained in the step S2 into drying equipment, and continuously drying for 20-30 minutes at the temperature of 350-400 ℃ to enable the solid mixture to be dried to constant weight, so as to obtain semi-finished aggregate;
and S4, adding water-soluble resin into spraying equipment, uniformly spraying the water-soluble resin on the surface of the semi-finished aggregate obtained in the step S3, placing the semi-finished aggregate into drying equipment after the spraying is finished, continuously drying at 500-550 ℃ for 30-40 minutes, and taking out and cooling the semi-finished aggregate to obtain the reinforced regenerated coarse aggregate.
Preferably, the rotation speed of the high-speed stirrer in the step S2 is 110-120 r/min when the raw materials are pre-stirred, and the rotation speed is set to be 90-110 r/min after water is added.
Preferably, in the step S4, the mixture a is immersed in the solution when being immersed, and the indoor temperature is kept within the range of 22-26 ℃.
Preferably, the soaking device used for soaking the mixture A in the step S4 comprises a main body, a filter cylinder is arranged on the inner side of the main body, electric telescopic rods are fixedly arranged on two sides of the outer portion of the machine body, a supporting seat is fixedly connected with the bottom end of each electric telescopic rod, rolling wheels are fixedly connected on two sides of the bottom of the machine body, a drainage pipeline is communicated with the middle of the bottom of the machine body, and handles are fixedly arranged on two sides of the machine body.
Compared with the related art, the sponge city high-strength recycled aggregate concrete and the preparation method thereof have the following beneficial effects:
the invention provides a sponge city high-strength recycled aggregate concrete and a preparation method thereof, wherein the reinforced recycled coarse aggregate is used, the overall physical performance is more stable, the performance is also obviously improved and promoted, the performance decay rate is slow after long-term use, meanwhile, the physical performance and the mechanical property of the concrete are further promoted by adding a modifying reinforcing agent, the strength of the recycled aggregate can be effectively improved, meanwhile, the internal polyvinyl alcohol can permeate into the recycled coarse aggregate, the pores and cracks of the recycled coarse aggregate are filled, a film is formed to cover the surface pores of the recycled coarse aggregate, the recycled aggregate is effectively protected, the influence of external environment is not easy, the connection between raw materials can be enhanced, and the concrete has stable and durable compressive strength, wear resistance, freezing resistance and deformation resistance and is better adapted to the environment with high pressure.
Drawings
FIG. 1 is a schematic view of the structure of the outside of the soaking device according to the present invention;
fig. 2 is a schematic view of the inside of the machine body shown in fig. 1.
Reference numerals in the figures
1. A main body;
2. a filter cartridge;
3. an electric telescopic rod;
4. a support base;
5. a rolling wheel;
6. a drain pipe;
7. a handle.
Detailed Description
The invention will be further described with reference to the drawings and embodiments.
First embodiment
Referring to fig. 1 and fig. 2 in combination, fig. 1 is a schematic structural diagram of an exterior of a soaking device according to the present invention; fig. 2 is a schematic view of the inside of the machine body shown in fig. 1. The sponge city high-strength recycled aggregate concrete comprises the following raw materials in parts by weight:
600 parts of reinforced recycled coarse aggregate, 400 parts of cement, 100 parts of water, 50 parts of steel slag powder, 35 parts of limestone powder, 30 parts of nano silicon dioxide, 20 parts of graphene oxide powder, 15 parts of polyacrylate, 10 parts of water glass, 5 parts of water reducer, 4 parts of super absorbent resin and 6 parts of modified reinforcing agent;
wherein the modified reinforcing agent comprises the following raw materials in parts by weight:
15 parts of nano calcium carbonate, 12 parts of polyvinyl alcohol, 8 parts of boron trioxide, 4 parts of amino trimethylene phosphonate, 0.8 part of coupling agent and 10 parts of water;
the effect of nano calcium carbonate is similar to that of nano silicon dioxide, so that the use amount of nano silicon dioxide can be reduced by adding nano calcium carbonate, so that the production cost is reduced, meanwhile, the nano calcium carbonate also improves the strength of the recycled aggregate through the nano boron trioxide, the problem of uneven quality and level of the aggregate is solved, the polyvinyl alcohol and the amino-trimethylene phosphonate can permeate into the recycled coarse aggregate, the pores and the cracks of the recycled coarse aggregate are filled, a film is formed to cover the surface pores of the recycled coarse aggregate, and the film has certain hydrophilicity.
The preparation method of the modified reinforcing agent comprises the following operation steps:
s1, uniformly mixing polyvinyl alcohol and diboron trioxide, heating to 30 ℃, adding nano calcium carbonate, and continuously stirring for 20 minutes to obtain a blend;
s2, dividing the amino trimethylene phosphonate into three equal parts, sequentially adding the three equal parts into a coupling agent, stirring in the same direction, adding water with the same amount after adding one part of amino trimethylene phosphonate, standing for 5 minutes, continuously adding the next part of amino trimethylene phosphonate until the addition of the amino trimethylene phosphonate is completed, and cooling for 2 minutes to obtain a mixed solution;
and S3, adding the mixed solution obtained in the step S2 into the blend obtained in the step S1, uniformly stirring and mixing, heating to 80 ℃ in a water bath, adding the rest water, slowly stirring, continuously stirring for 5 minutes, stopping heating, and taking out and cooling to obtain the modified reinforcing agent.
The concentration of the water glass is 40wt% and the concentration of the polyvinyl alcohol is 30wt%.
The preparation method of the sponge city high-strength recycled aggregate concrete comprises the following operation steps:
s1, treating recycled aggregate: firstly, breaking up waste concrete blocks to blocks with the diameter length smaller than 60mm, and then sequentially carrying out the processes of spraying, screening, crushing, strengthening and drying collection on the block-shaped concrete to finally obtain the strengthening recycled aggregate with the average particle size of 5-8 mm;
wherein, the strengthening treatment of the aggregate in the S1 comprises the following operation steps:
s11, slowly adding water glass into nano calcium carbonate, fully stirring and mixing to obtain a mixture, continuously adding water with the volume being 2 times that of the mixture, uniformly mixing, and standing for 3 hours;
s12, adding concrete particles into the mixture obtained in the step S1, fully stirring and mixing, adding water with a half of the total volume again, fully mixing, soaking for 3 hours under the negative pressure of 0.3MPa, and filtering to obtain a solid mixture;
s13, placing the solid mixture obtained in the step S2 into drying equipment, and continuously drying for 20 minutes at the temperature of 350 ℃ to enable the solid mixture to be dried to constant weight, so as to obtain semi-finished aggregate;
s14, adding water-soluble resin into spraying equipment, uniformly spraying the surface of the semi-finished aggregate obtained in the step S3, placing the semi-finished aggregate into drying equipment after spraying, continuously drying at 500 ℃ for 30 minutes, and taking out and cooling to obtain the reinforced recycled coarse aggregate.
S2, placing cement, steel slag powder and limestone powder into a high-speed stirrer, pre-stirring for 2 minutes to uniformly mix the raw materials, then slowly adding water which is half of the total volume of the mixture, continuously stirring for 15 minutes to obtain a mixture A, wherein the rotating speed of the high-speed stirrer is 110 rpm when the raw materials are pre-stirred, and the rotating speed of the high-speed stirrer is 90 rpm after the water is added;
s3, uniformly mixing nano silicon dioxide, graphene oxide powder and a half of polyacrylate, heating to 55 ℃, adding water of which the total volume is half of that of the mixture, continuously stirring until the temperature rises to 75 ℃, stopping heating, continuously adding the rest half of polyacrylate, continuously stirring for 5 minutes, standing and cooling to a normal temperature state, and obtaining a mixed solution;
s4, sequentially adding the super absorbent resin, the modified reinforcing agent and the rest of water into a soaking device, stirring to uniformly mix the super absorbent resin, the modified reinforcing agent and the rest of water, adding the mixture A obtained in the S1, soaking the mixture A, keeping the indoor temperature within a range of 22 ℃ during soaking, and filtering the solution after the soaking is continued for 2 hours to obtain a mixture B;
and S5, adding the mixed solution obtained in the step S3 and the mixture B obtained in the step S4 into a stirring device, continuously stirring for 10 minutes, sequentially adding water glass and a water reducing agent, and continuously stirring for 25 minutes to obtain the required high-strength recycled aggregate concrete.
The soaking device for soaking the mixture A in the S4 comprises a main body 1, a filter cylinder 2 is arranged on the inner side of the main body 1, electric telescopic rods 3 are fixedly arranged on two sides of the outer portion of the machine body 1, supporting seats 4 are fixedly connected with the bottom ends of the electric telescopic rods 3, rolling wheels 5 are fixedly connected with two sides of the bottom of the machine body 1, a drainage pipeline 6 is communicated with the middle of the bottom of the machine body 1, and handles 7 are fixedly arranged on two sides of the machine body 1.
The round hole has evenly been seted up to cartridge filter 2 outside, be convenient for to solution and solid separation, the joint can be with the inboard quick separation of organism 1, be convenient for wash organism 1 and cartridge filter 2, two electric telescopic handle 3 are located the bottom position of organism 1 left and right sides respectively, external has the power, it is flexible through electric telescopic handle 3, make supporting seat 4 can remove, and then make organism 1 receive the reaction force, can remove in vertical direction, two rolls wheel 5 install the left and right sides in organism 1 bottom respectively, be convenient for organism 1 removes, and when need not remove, drive supporting seat 4 through electric telescopic handle 3 and remove to with ground contact, provide stable support for organism 1, make the device can keep steady state, simultaneously can be according to the user demand, through control electric telescopic handle 3 flexible, the height-adjusting to the device, this soaking device is convenient when removing, can be according to the user demand height-adjusting, be convenient for realize solid and liquid separation, it is very convenient to use, very nimble.
Second embodiment
Based on the first embodiment of the invention, the second embodiment of the invention provides another sponge city high-strength recycled aggregate concrete and a preparation method thereof, wherein the second embodiment does not prevent the independent implementation of the technical scheme of the first embodiment.
Specifically, the invention provides another sponge city high-strength recycled aggregate concrete and a preparation method thereof, wherein the sponge city high-strength recycled aggregate concrete is characterized in that:
700 parts of reinforced recycled coarse aggregate, 500 parts of cement, 150 parts of water, 70 parts of steel slag powder, 55 parts of limestone powder, 45 parts of nano silicon dioxide, 30 parts of graphene oxide powder, 25 parts of polyacrylate, 17 parts of water glass, 8 parts of water reducer, 6 parts of super absorbent resin and 9 parts of modified reinforcing agent;
wherein the modified reinforcing agent comprises the following raw materials in parts by weight:
17 parts of nano calcium carbonate, 15 parts of polyvinyl alcohol, 10 parts of diboron trioxide, 6 parts of amino trimethylene phosphonate, 1 part of coupling agent and 15 parts of water;
the preparation method of the modified reinforcing agent comprises the following operation steps:
s1, uniformly mixing polyvinyl alcohol and diboron trioxide, heating to 35 ℃, adding nano calcium carbonate, and continuously stirring for 25 minutes to obtain a blend;
s2, dividing the amino trimethylene phosphonate into three equal parts, sequentially adding the three equal parts into a coupling agent, stirring in the same direction, adding water with the same amount after adding one part of amino trimethylene phosphonate each time, standing for 8 minutes, continuously adding the next part of amino trimethylene phosphonate until the addition of the amino trimethylene phosphonate is completed, and cooling for 3 minutes to obtain a mixed solution;
and S3, adding the mixed solution obtained in the step S2 into the blend obtained in the step S1, uniformly stirring and mixing, heating the mixture to 85 ℃ in a water bath, adding the rest water, slowly stirring the mixture, continuously stirring the mixture for 8 minutes, stopping heating, and taking out and cooling the mixture to obtain the modified reinforcing agent.
The concentration of the water glass is 43wt% and the concentration of the polyvinyl alcohol is 33wt%.
The preparation method of the sponge city high-strength recycled aggregate concrete comprises the following operation steps:
s1, treating recycled aggregate: firstly, breaking up waste concrete blocks to blocks with the diameter length smaller than 60mm, and then sequentially carrying out the processes of spraying, screening, crushing, strengthening and drying collection on the block-shaped concrete to finally obtain the strengthening recycled aggregate with the average particle size of 5-8 mm;
wherein, the strengthening treatment of the aggregate in the S1 comprises the following operation steps:
s11, slowly adding water glass into nano calcium carbonate, fully stirring and mixing to obtain a mixture, continuously adding water with the volume being 3 times that of the mixture, uniformly mixing, and standing for 4 hours;
s12, adding concrete particles into the mixture obtained in the step S1, fully stirring and mixing, adding water with a half of the total volume again, fully mixing, soaking for 3.5 hours under the negative pressure of 0.4MPa, and filtering to obtain a solid mixture;
s13, placing the solid mixture obtained in the step S2 into drying equipment, and continuously drying for 25 minutes at the temperature of 380 ℃ to enable the solid mixture to be dried to constant weight, so as to obtain semi-finished aggregate;
and S14, adding water-soluble resin into spraying equipment, uniformly spraying the surface of the semi-finished aggregate obtained in the step S3, placing the semi-finished aggregate into drying equipment after the spraying is finished, continuously drying at the temperature of 525 ℃ for 35 minutes, and taking out and cooling to obtain the reinforced recycled coarse aggregate.
S2, placing cement, steel slag powder and limestone powder into a high-speed stirrer, pre-stirring for 4 minutes to uniformly mix the raw materials, then slowly adding water which is half of the total volume of the mixture, continuously stirring for 17 minutes to obtain a mixture A, wherein the rotating speed of the high-speed stirrer is 115 rpm when the raw materials are pre-stirred, and the rotating speed of the high-speed stirrer is 100 rpm after the water is added;
s3, uniformly mixing nano silicon dioxide, graphene oxide powder and a half of polyacrylate, heating to 58 ℃, adding water of which the total volume is half of that of the mixture, continuously stirring until the temperature rises to 78 ℃, stopping heating, continuously adding the rest half of polyacrylate, continuously stirring for 8 minutes, standing and cooling to a normal temperature state, and obtaining a mixed solution;
s4, sequentially adding the super absorbent resin, the modified reinforcing agent and the rest of water into a soaking device, stirring to uniformly mix the super absorbent resin, the modified reinforcing agent and the rest of water, adding the mixture A obtained in the S1, soaking the mixture A, keeping the indoor temperature within the range of 24 ℃ during soaking, continuously soaking for 2.5 hours, and filtering the solution to obtain a mixture B;
and S5, adding the mixed solution obtained in the step S3 and the mixture B obtained in the step S4 into a stirring device, continuously stirring for 12 minutes, sequentially adding water glass and a water reducing agent, and continuously stirring for 28 minutes to obtain the required high-strength recycled aggregate concrete.
Third embodiment
Based on the first embodiment of the invention, the third embodiment of the invention provides another sponge city high-strength recycled aggregate concrete and a preparation method thereof, wherein the third embodiment does not prevent the independent implementation of the technical scheme of the first embodiment.
Specifically, the invention provides another sponge city high-strength recycled aggregate concrete and a preparation method thereof, wherein the sponge city high-strength recycled aggregate concrete is characterized in that:
the material comprises the following raw materials in parts by weight:
800 parts of reinforced recycled coarse aggregate, 600 parts of cement, 200 parts of water, 100 parts of steel slag powder, 70 parts of limestone powder, 60 parts of nano silicon dioxide, 40 parts of graphene oxide powder, 30 parts of polyacrylate, 15 parts of water glass, 10 parts of water reducer, 8 parts of super absorbent resin and 12 parts of modified reinforcing agent;
wherein the modified reinforcing agent comprises the following raw materials in parts by weight:
20 parts of nano calcium carbonate, 18 parts of polyvinyl alcohol, 12 parts of boron trioxide, 8 parts of amino trimethylene phosphonate, 1.2 parts of coupling agent and 20 parts of water;
the preparation method of the modified reinforcing agent comprises the following operation steps:
s1, uniformly mixing polyvinyl alcohol and diboron trioxide, heating to 40 ℃, adding nano calcium carbonate, and continuously stirring for 30 minutes to obtain a blend;
s2, dividing the amino trimethylene phosphonate into three equal parts, sequentially adding the three equal parts into a coupling agent, stirring in the same direction, adding water with the same amount after adding one part of amino trimethylene phosphonate, standing for 10 minutes, continuously adding the next part of amino trimethylene phosphonate until the addition of the amino trimethylene phosphonate is completed, and cooling for 5 minutes to obtain a mixed solution;
and S3, adding the mixed solution obtained in the step S2 into the blend obtained in the step S1, uniformly stirring and mixing, heating to 90 ℃ in a water bath, adding the rest water, slowly stirring, continuously stirring for 10 minutes, stopping heating, and taking out and cooling to obtain the modified reinforcing agent.
The concentration of the water glass is 45wt% and the concentration of the polyvinyl alcohol is 36wt%.
The preparation method of the sponge city high-strength recycled aggregate concrete comprises the following operation steps:
s1, treating recycled aggregate: firstly, breaking up waste concrete blocks to blocks with the diameter length smaller than 60mm, and then sequentially carrying out the processes of spraying, screening, crushing, strengthening and drying collection on the block-shaped concrete to finally obtain the strengthening recycled aggregate with the average particle size of 5-8 mm;
wherein, the strengthening treatment of the aggregate in the S1 comprises the following operation steps:
s11, slowly adding water glass into nano calcium carbonate, fully stirring and mixing to obtain a mixture, continuously adding water with the volume being 4 times that of the mixture, uniformly mixing, and standing for 5 hours;
s12, adding concrete particles into the mixture obtained in the step S1, fully stirring and mixing, adding water with a half of the total volume again, fully mixing, soaking for 4 hours under the negative pressure of 0.5MPa, and filtering to obtain a solid mixture;
s13, placing the solid mixture obtained in the step S2 into drying equipment, and continuously drying for 30 minutes at the temperature of 400 ℃ to enable the solid mixture to be dried to constant weight, so as to obtain semi-finished aggregate;
and S14, adding water-soluble resin into spraying equipment, uniformly spraying the surface of the semi-finished aggregate obtained in the step S3, placing the semi-finished aggregate into drying equipment after the spraying is finished, continuously drying at 550 ℃ for 40 minutes, and taking out and cooling to obtain the reinforced recycled coarse aggregate.
S2, placing cement, steel slag powder and limestone powder into a high-speed stirrer, pre-stirring for 5 minutes to uniformly mix the raw materials, then slowly adding water which is half of the total volume of the mixture, continuously stirring for 20 minutes to obtain a mixture A, wherein the rotating speed of the high-speed stirrer is 120 r/min when the raw materials are pre-stirred, and the rotating speed of the high-speed stirrer is 110 r/min after the water is added;
s3, uniformly mixing nano silicon dioxide, graphene oxide powder and a half of polyacrylate, heating to 60 ℃, adding water of which the total volume is half of that of the mixture, continuously stirring until the temperature rises to 80 ℃, stopping heating, continuously adding the rest half of polyacrylate, continuously stirring for 10 minutes, standing and cooling to a normal temperature state, and obtaining a mixed solution;
s4, sequentially adding the super absorbent resin, the modified reinforcing agent and the rest of water into a soaking device, stirring to uniformly mix the super absorbent resin, the modified reinforcing agent and the rest of water, adding the mixture A obtained in the S1, soaking the mixture A, keeping the indoor temperature within the range of 26 ℃ during soaking, and filtering the solution after continuously soaking for 3 hours to obtain a mixture B;
and S5, adding the mixed solution obtained in the step S3 and the mixture B obtained in the step S4 into a stirring device, continuously stirring for 15 minutes, sequentially adding water glass and a water reducer, and continuously stirring for 30 minutes to obtain the required high-strength recycled aggregate concrete.
Fourth embodiment
Based on the first embodiment of the invention, the fourth embodiment of the invention provides another sponge city high-strength recycled aggregate concrete and a preparation method thereof, wherein the fourth embodiment does not prevent the independent implementation of the technical scheme of the first embodiment.
Specifically, the invention provides another sponge city high-strength recycled aggregate concrete and a preparation method thereof, wherein the sponge city high-strength recycled aggregate concrete is characterized in that:
the material comprises the following raw materials in parts by weight:
600 parts of reinforced recycled coarse aggregate, 600 parts of cement, 100 parts of water, 100 parts of steel slag powder, 35 parts of limestone powder, 60 parts of nano silicon dioxide, 20 parts of graphene oxide powder, 30 parts of polyacrylate, 10 parts of water glass, 10 parts of water reducer, 4 parts of super absorbent resin and 12 parts of modified reinforcing agent;
wherein the modified reinforcing agent comprises the following raw materials in parts by weight:
15 parts of nano calcium carbonate, 18 parts of polyvinyl alcohol, 8 parts of boron trioxide, 8 parts of amino trimethylene phosphonate, 0.8 part of coupling agent and 20 parts of water;
the preparation method of the modified reinforcing agent comprises the following operation steps:
s1, uniformly mixing polyvinyl alcohol and diboron trioxide, heating to 30 ℃, adding nano calcium carbonate, and continuously stirring for 30 minutes to obtain a blend;
s2, dividing the amino trimethylene phosphonate into three equal parts, sequentially adding the three equal parts into a coupling agent, stirring in the same direction, adding water with the same amount after adding one part of amino trimethylene phosphonate, standing for 5 minutes, continuously adding the next part of amino trimethylene phosphonate until the addition of the amino trimethylene phosphonate is completed, and cooling for 5 minutes to obtain a mixed solution;
and S3, adding the mixed solution obtained in the step S2 into the blend obtained in the step S1, uniformly stirring and mixing, heating to 80 ℃ in a water bath, adding the rest water, slowly stirring, continuously stirring for 10 minutes, stopping heating, and taking out and cooling to obtain the modified reinforcing agent.
The concentration of the water glass is 40wt% and the concentration of the polyvinyl alcohol is 36wt%.
The preparation method of the sponge city high-strength recycled aggregate concrete comprises the following operation steps:
s1, treating recycled aggregate: firstly, breaking up waste concrete blocks to blocks with the diameter length smaller than 60mm, and then sequentially carrying out the processes of spraying, screening, crushing, strengthening and drying collection on the block-shaped concrete to finally obtain the strengthening recycled aggregate with the average particle size of 5-8 mm;
wherein, the strengthening treatment of the aggregate in the S1 comprises the following operation steps:
s11, slowly adding water glass into nano calcium carbonate, fully stirring and mixing to obtain a mixture, continuously adding water with the volume being 2 times that of the mixture, uniformly mixing, and standing for 5 hours;
s12, adding concrete particles into the mixture obtained in the step S1, fully stirring and mixing, adding water with a half of the total volume again, fully mixing, soaking for 4 hours under the negative pressure of 0.3MPa, and filtering to obtain a solid mixture;
s13, placing the solid mixture obtained in the step S2 into drying equipment, and continuously drying for 30 minutes at the temperature of 350 ℃ to enable the solid mixture to be dried to constant weight, so as to obtain semi-finished aggregate;
s14, adding water-soluble resin into spraying equipment, uniformly spraying the surface of the semi-finished aggregate obtained in the step S3, placing the semi-finished aggregate into drying equipment after spraying, continuously drying at 500 ℃ for 40 minutes, and taking out and cooling to obtain the reinforced recycled coarse aggregate.
S2, placing cement, steel slag powder and limestone powder into a high-speed stirrer, pre-stirring for 2 minutes to uniformly mix the raw materials, then slowly adding water which is half of the total volume of the mixture, continuously stirring for 20 minutes to obtain a mixture A, wherein the rotating speed of the high-speed stirrer is 110 rpm when the raw materials are pre-stirred, and the rotating speed of the high-speed stirrer is 110 rpm after the water is added;
s3, uniformly mixing nano silicon dioxide, graphene oxide powder and a half of polyacrylate, heating to 55 ℃, adding water of which the total volume is half of that of the mixture, continuously stirring until the temperature rises to 80 ℃, stopping heating, continuously adding the rest half of polyacrylate, continuously stirring for 5 minutes, standing and cooling to a normal temperature state, and obtaining a mixed solution;
s4, sequentially adding the super absorbent resin, the modified reinforcing agent and the rest of water into a soaking device, stirring to uniformly mix the super absorbent resin, the modified reinforcing agent and the rest of water, adding the mixture A obtained in the S1, soaking the mixture A, keeping the indoor temperature within a range of 22 ℃ during soaking, continuously soaking for 3 hours, and filtering the solution to obtain a mixture B;
and S5, adding the mixed solution obtained in the step S3 and the mixture B obtained in the step S4 into a stirring device, continuously stirring for 10 minutes, sequentially adding water glass and a water reducing agent, and continuously stirring for 30 minutes to obtain the required high-strength recycled aggregate concrete.
The water permeability, compressive strength, fatigue deformation resistance modulus, bulk density and softening coefficient of the sponge city high-strength recycled aggregate concrete prepared in examples 1 to 4 were respectively compared, and 100 groups of experimental objects were randomly extracted in each example to ensure the accuracy of the experiment, the obtained data were represented by average values, and the data of all examples were normalized based on the data of example 1 for the convenience of comparison.
TABLE 1
| Permeability to water | Compressive Strength | Fatigue deformation modulus | Bulk density of | Softening coefficient | |
| Example 1 | 30.15％ | 41.23MPa | 1.34·104N/mm2 | 973ka/m 3 | 0.931 |
| Example 2 | 33.12％ | 43.17MPa | 1.31·104N/mm2 | 988ka/m 3 | 0.811 |
| Example 3 | 39.75％ | 40.68MPa | 1.40·104N/mm2 | 981ka/m 3 | 0.921 |
| Example 4 | 31.23％ | 39.11MPa | 1.33·104N/mm2 | 979ka/m 3 | 0.845 |
From the above table, since the sponge city high-strength recycled aggregate concrete prepared in example 2 is the best in terms of water permeability, compressive strength, fatigue deformation resistance modulus, bulk density, and softening coefficient, the sponge city high-strength recycled aggregate concrete and the preparation method given in example 2 are the best choice.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present invention.
Claims (6)
1. The sponge city high-strength recycled aggregate concrete is characterized by comprising the following raw materials in parts by weight:
600-800 parts of reinforced recycled coarse aggregate, 400-600 parts of cement, 100-200 parts of water, 50-100 parts of steel slag powder, 35-70 parts of limestone powder, 30-60 parts of nano silicon dioxide, 20-40 parts of graphene oxide powder, 15-30 parts of polyacrylate, 10-15 parts of water glass, 5-10 parts of water reducer, 4-8 parts of super absorbent resin and 6-12 parts of modified reinforcing agent;
wherein the modified reinforcing agent comprises the following raw materials in parts by weight:
15-20 parts of nano calcium carbonate, 12-18 parts of polyvinyl alcohol, 8-12 parts of diboron trioxide, 4-8 parts of amino trimethylene phosphonate, 0.8-1.2 parts of coupling agent and 10-20 parts of water;
the preparation method of the modified reinforcing agent comprises the following operation steps:
s1, uniformly mixing polyvinyl alcohol and diboron trioxide, heating to 30-40 ℃, adding nano calcium carbonate, and continuously stirring for 20-30 minutes to obtain a blend;
s2, dividing the amino trimethylene phosphonate into three equal parts, sequentially adding the three equal parts into a coupling agent, stirring in the same direction, adding water with the same amount after adding one part of amino trimethylene phosphonate, standing for 5-10 minutes, continuously adding the next part of amino trimethylene phosphonate until all three parts of amino trimethylene phosphonate are added, and cooling for 2-5 minutes to obtain a mixed solution;
s3, adding the mixed solution obtained in the step S2 into the blend obtained in the step S1, uniformly stirring and mixing, heating in a water bath to 80-90 ℃, adding the rest water, slowly stirring, continuously stirring for 5-10 minutes, stopping heating, and taking out and cooling to obtain the modified reinforcing agent;
the average grain size of the steel slag powder is 3.25-4.37mm, the average grain size of the limestone powder is 2.64-3.82 mu m, the water reducing agent adopts a polycarboxylic acid type high-efficiency water reducing agent, the water reducing rate is 20-25%, and the super absorbent resin is any one or a plurality of compositions of polyacrylate, starch acrylate polymer and starch-acrylonitrile grafting copolymer; the concentration of the water glass is 40-45wt% and the concentration of the polyvinyl alcohol is 30-36 wt%;
the preparation method of the sponge city high-strength recycled aggregate concrete comprises the following operation steps:
s1, treating recycled coarse aggregate: firstly, breaking up waste concrete blocks to blocks with the diameter length smaller than 60mm, and then sequentially performing the processes of spraying, screening, crushing, strengthening and drying collection on the block-shaped concrete to finally obtain the strengthening regenerated coarse aggregate with the average particle size of 5-8 mm;
s2, placing cement, steel slag powder and limestone powder into a high-speed stirrer, pre-stirring for 2-5 minutes to uniformly mix the raw materials, then slowly adding water which is half of the total volume of the mixture, and continuously stirring for 15-20 minutes to obtain a mixture A;
s3, uniformly mixing nano silicon dioxide, graphene oxide powder and a half of polyacrylate, heating to 55-60 ℃, adding water with a half of the total volume, continuously stirring until the temperature rises to 75-80 ℃, stopping heating, continuously adding the rest half of polyacrylate, continuously stirring for 5-10 minutes, standing, and cooling to a normal temperature state to obtain a mixed solution;
s4, sequentially adding the super absorbent resin, the modified reinforcing agent and the rest of water into a soaking device, stirring to uniformly mix the super absorbent resin, the modified reinforcing agent and the rest of water, adding the mixture A obtained in the S1, soaking the mixture A for 2-3 hours, and filtering the solution to obtain a mixture B;
and S5, adding the mixed solution obtained in the step S3 and the mixture B obtained in the step S4 into a stirring device, continuously stirring for 10-15 minutes, sequentially adding water glass and a water reducer, and continuously stirring for 25-30 minutes to obtain the required high-strength recycled aggregate concrete.
2. The sponge city high-strength recycled aggregate concrete according to claim 1, wherein 600 parts of the reinforced recycled coarse aggregate, 400 parts of cement, 100 parts of water, 50 parts of steel slag powder, 35 parts of limestone powder, 30 parts of nano silicon dioxide, 20 parts of graphene oxide powder, 15 parts of polyacrylate, 10 parts of water glass, 5 parts of a water reducer, 4 parts of a super absorbent resin and 6 parts of a modified reinforcing agent.
3. The sponge city high strength recycled aggregate concrete as claimed in claim 1, wherein the reinforcing treatment of the aggregate in S1 comprises the following steps:
s1, slowly adding water glass into nano calcium carbonate, fully stirring and mixing to obtain a mixture, continuously adding water with the volume being 2-4 times that of the mixture, uniformly mixing, and standing for 3-5 hours;
s2, adding concrete particles into the mixture obtained in the step S1, fully stirring and mixing, adding water with a half of the total volume again, fully mixing, soaking for 3-4 hours under the negative pressure of 0.3-0.5MPa, and filtering to obtain a solid mixture;
s3, placing the solid mixture obtained in the step S2 into drying equipment, and continuously drying for 20-30 minutes at the temperature of 350-400 ℃ to enable the solid mixture to be dried to constant weight, so as to obtain semi-finished aggregate;
and S4, adding water-soluble resin into spraying equipment, uniformly spraying the water-soluble resin on the surface of the semi-finished aggregate obtained in the step S3, placing the semi-finished aggregate into drying equipment after the spraying is finished, continuously drying at 500-550 ℃ for 30-40 minutes, and taking out and cooling the semi-finished aggregate to obtain the reinforced regenerated coarse aggregate.
4. The sponge city high strength recycled aggregate concrete as claimed in claim 1, wherein the speed of the high speed mixer in S2 is 110-120 rpm when pre-mixing the raw materials, and is set to 90-110 rpm after adding water.
5. The sponge city high strength recycled aggregate concrete as claimed in claim 1, wherein in S4, when mixture a is subjected to the soaking treatment, mixture a is required to be completely immersed in the solution, and the indoor temperature is kept in the range of 22-26 ℃.
6. The sponge city high strength recycled aggregate concrete according to claim 1, wherein the soaking device used for soaking the mixture a in S4 comprises a main body, a filter cartridge is arranged on the inner side of the main body, electric telescopic rods are fixedly mounted on two sides of the outer part of the machine body, a supporting seat is fixedly connected to the bottom end of each electric telescopic rod, rolling wheels are fixedly connected to two sides of the bottom of the machine body, a drainage pipeline is communicated with the middle of the bottom of the machine body, and handles are fixedly mounted on two sides of the machine body.
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