CN113716903A - 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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- 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
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- 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
- 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
- C04B40/0039—Premixtures of ingredients
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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: 800 portions of reinforced recycled coarse aggregate, 600 portions of cement and 200 portions of water. The invention provides a sponge city high-strength recycled aggregate concrete and a preparation method thereof, wherein a modification reinforcing agent is added to further improve the physical property and the mechanical property of the concrete, the strength of the recycled aggregate can be effectively improved, meanwhile, internal polyvinyl alcohol can permeate into the recycled coarse aggregate to fill pores and cracks of the recycled coarse aggregate, and a film is formed to cover the pores on the surface of the recycled coarse aggregate, so that the recycled aggregate is effectively protected, the influence of the external environment is not easily caused, and meanwhile, the connection among raw materials can be enhanced, so that the concrete has stable and lasting compressive strength, wear resistance, frost resistance and deformation resistance, and is better suitable for the high-pressure environment.
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 of city rain and flood management concept, means that the city can have good elasticity in the aspects of adapting to environmental changes, coping with natural disasters caused by rainwater and the like a sponge, can also be called as a water elasticity city, absorbs water, stores water, seeps water and purifies water when raining, releases and utilizes the stored water when needed, and realizes the free migration of rainwater in the city. From the ecological system service, the water ecological infrastructure is constructed through cross-scale construction and is constructed by combining various specific technologies, and the water ecological infrastructure is the core of a sponge city.
The sponge urban material is substantially applied, and has the characteristics of excellent water seepage, compression resistance, wear resistance, skid resistance, environmental protection, beauty, colorful appearance, comfort, easy maintenance, sound absorption, noise reduction and the like, for example, common environment-friendly recycled aggregate concrete has the functions of efficient water seepage and drainage after urban roads and squares are paved by utilizing the outstanding water permeability of the common environment-friendly recycled aggregate concrete, promotes the resource utilization of solid wastes by recycling the construction wastes, and has good effects of environmental protection and resource saving.
In the related art, the recycled aggregate concrete for sponge cities has many 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 in the concrete has different quality levels and is unstable in overall physical performance, so that the concrete is easy to have obvious reduction in performances such as compression resistance, freezing resistance and wear resistance after being used for a long time, the construction surface is cracked or collapsed, 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 above technical problems.
Disclosure of Invention
The invention provides high-strength recycled aggregate concrete for sponge cities and a preparation method thereof, and solves the problem that the performance of the recycled aggregate concrete is obviously reduced after the recycled aggregate concrete is used for a long time.
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:
800 parts of reinforced recycled coarse aggregate, 600 parts of cement, 100 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 a water reducing agent, 4-8 parts of super absorbent resin and 6-12 parts of a modification reinforcing agent;
wherein the modification 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 boron 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 modification reinforcing agent comprises the following operation steps:
s1, uniformly mixing polyvinyl alcohol and boron 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 the coupling agent, stirring the three equal parts in the same direction, adding water with the same amount continuously after each part of the amino trimethylene phosphonate is added, standing for 5-10 minutes, continuously adding the next part of the amino trimethylene phosphonate until all the part of the amino trimethylene phosphonate is 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, stopping heating after continuously stirring for 5-10 minutes, taking out, and cooling to obtain the modified reinforcing agent.
Preferably, the reinforced recycled coarse aggregate comprises 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 reducing agent, 4 parts of super absorbent resin and 6 parts of modification 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 μm.
Preferably, the water reducing agent is a polycarboxylic acid type high-efficiency water reducing agent, the water reducing rate is 20-25%, and the super absorbent resin is one or a combination of a plurality of polyacrylate, a starch acrylate polymer and a starch-acrylonitrile graft copolymer.
Preferably, the concentration of the water glass is 40-45 wt%, and the concentration of the polyvinyl alcohol is 30-36 wt%.
A preparation method of sponge city high-strength recycled aggregate concrete comprises the following operation steps:
s1, recycled aggregate treatment: firstly, breaking waste concrete blocks into blocks with the diameter and the length smaller than 60mm, and then sequentially carrying out moisture spraying, screening, crushing, strengthening, drying and collecting treatment on the block concrete to finally obtain strengthened recycled 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, slowly adding water with 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 half of polyacrylate, heating to 55-60 ℃, adding water with half of the total volume, continuously stirring until the temperature rises to 75-80 ℃, stopping heating, continuously adding the remaining 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 modification reinforcing agent and the rest water into a soaking device, stirring to uniformly mix, adding the mixture A obtained in the step S1, soaking the mixture A for 2-3 hours, and filtering out the solution to obtain a mixture B;
and S5, adding the mixed solution obtained in the S3 and the mixture B obtained in the S4 into a stirring device, continuously stirring for 10-15 minutes, sequentially adding water glass and a water reducing agent, and continuously stirring for 25-30 minutes to obtain the required high-strength recycled aggregate concrete.
Preferably, the reinforcing treatment of the aggregate in S1 includes the following steps:
s1, slowly adding water glass into the nano calcium carbonate, fully stirring and mixing to obtain a mixture, continuously adding water with the volume 2-4 times that of the mixture, uniformly mixing, and standing for 3-5 hours;
s2, adding the concrete particles into the mixture obtained in the S1, fully stirring and mixing, adding water with 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 S2 into drying equipment, and continuously drying for 20-30 minutes at the temperature of 350-400 ℃ so that the solid mixture is dried to constant weight to obtain semi-finished aggregate;
s4, adding the water-soluble resin into a spraying device, uniformly spraying the water-soluble resin on the surface of the semi-finished aggregate obtained in the step S3, placing the semi-finished aggregate in a drying device after the spraying is finished, continuously drying for 30-40 minutes at the temperature of 500-550 ℃, taking out and cooling to obtain the reinforced recycled coarse aggregate.
Preferably, the rotation speed of the high-speed stirrer in the S2 is 110-120 rpm when the raw material is pre-stirred, and the rotation speed is set to be 90-110 rpm after the water is added.
Preferably, in the step S4, when the mixture a is subjected to the soaking treatment, the mixture a is completely immersed in the solution, and the room temperature is maintained within the range of 22-26 ℃.
Preferably, be used for carrying out the soak to mixture A in S4, soak device includes the main part, the inboard of main part is provided with the cartridge filter, the equal fixed mounting in the outside both sides of organism has electric telescopic handle, electric telescopic handle' S bottom fixedly connected with supporting seat, the equal fixedly connected with roll wheel in both sides of bottom of the body, the middle intercommunication of bottom of the body has drainage pipe, the equal fixed mounting in both sides of body has the handle.
Compared with the related technology, the sponge city high-strength recycled aggregate concrete and the preparation method thereof provided by the invention have the following beneficial effects:
the invention provides a sponge city high-strength recycled aggregate concrete and a preparation method thereof, the reinforced recycled coarse aggregate is used, the whole physical property of the concrete is more stable, the performance is obviously improved and promoted, the performance decay rate is slow after long-term use, meanwhile, the physical property and the mechanical property of the concrete are further promoted by adding a modification reinforcing agent, the strength of the recycled aggregate can be effectively improved, meanwhile, the polyvinyl alcohol in the concrete can permeate into the recycled coarse aggregate, the pores and cracks of the recycled coarse aggregate are filled, and the pores on the surface of the recycled coarse aggregate are covered by a film, so that the recycled aggregate is effectively protected, the concrete is not easily influenced by the external environment, the connection among all raw materials can be strengthened, and the concrete has stable and lasting compressive strength, wear resistance, frost resistance and deformation resistance, thereby being better suitable for high-pressure environment.
Drawings
FIG. 1 is a schematic view of the exterior of a soaking device according to the present invention;
fig. 2 is a schematic structural view of the interior of the housing shown in fig. 1.
Reference numerals in the figures
1. A main body;
2. a filter cartridge;
3. an electric telescopic rod;
4. a supporting seat;
5. a rolling wheel;
6. a drain pipe;
7. a handle.
Detailed Description
The invention is further described with reference to the following figures and embodiments.
First embodiment
Please refer to fig. 1 and fig. 2 in combination, wherein fig. 1 is a schematic structural diagram of an exterior of a soaking device according to the present invention; fig. 2 is a schematic structural view of the interior of the housing 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 reducing agent, 4 parts of super absorbent resin and 6 parts of modification reinforcing agent;
wherein the modification 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 the nano calcium carbonate is similar to that of the nano silicon dioxide, therefore, the use amount of the nano silicon dioxide can be reduced by adding the nano calcium carbonate, so that the production cost is reduced, meanwhile, the strength of the recycled aggregate is improved by adding the nano calcium carbonate and the boron trioxide, and the problem of uneven quality level of the aggregate is solved, and the polyvinyl alcohol and the amino trimethylene phosphonate can penetrate into the recycled coarse aggregate, so that the pores and cracks of the recycled coarse aggregate are filled, and a film is formed to cover the pores on the surface of the recycled coarse aggregate, and the film has certain hydrophilicity.
The preparation method of the modification reinforcing agent comprises the following operation steps:
s1, uniformly mixing polyvinyl alcohol and boron 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 the coupling agent, stirring the three equal parts in the same direction, adding water with the same amount continuously after each part of the amino trimethylene phosphonate is added, standing for 5 minutes, continuously adding the next part of the amino trimethylene phosphonate until all the part of the amino trimethylene phosphonate is added, and cooling for 2 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 ℃, adding the rest water, slowly stirring, stopping heating after continuously stirring for 5 minutes, taking out and cooling to obtain the modification reinforcing agent.
The concentration of the water glass is 40 wt%, and the concentration of the polyvinyl alcohol is 30 wt%.
A preparation method of sponge city high-strength recycled aggregate concrete comprises the following operation steps:
s1, recycled aggregate treatment: firstly, breaking waste concrete blocks into blocks with the diameter and the length smaller than 60mm, and then sequentially carrying out moisture spraying, screening, crushing, strengthening, drying and collecting treatment on the block concrete to finally obtain strengthened recycled aggregate with the average particle size of 5-8 mm;
the reinforcing treatment of the aggregate in the S1 comprises the following operation steps:
s11, slowly adding water glass into the nano calcium carbonate, fully stirring and mixing to obtain a mixture, continuously adding water with the volume 2 times that of the mixture, uniformly mixing, and standing for 3 hours;
s12, adding the concrete particles into the mixture obtained in the S1, fully stirring and mixing, adding water with 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, putting the solid mixture obtained in the S2 into drying equipment, and continuously drying for 20 minutes at the temperature of 350 ℃ to dry the solid mixture to constant weight to obtain semi-finished aggregate;
and S14, 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 for 30 minutes at the temperature of 500 ℃, 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, slowly adding water with 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 revolutions per minute when the high-speed stirrer pre-stirs the raw materials, and the rotating speed is set to be 90 revolutions per minute after the water is added;
s3, uniformly mixing nano silicon dioxide, graphene oxide powder and half of polyacrylate, heating to 55 ℃, adding water with half of the total volume, continuously stirring until the temperature rises to 75 ℃, stopping heating, continuously adding the remaining half of polyacrylate, continuously stirring for 5 minutes, standing and cooling to a normal temperature state to obtain a mixed solution;
s4, sequentially adding the super absorbent resin, the modification reinforcing agent and the rest water into a soaking device, stirring to uniformly mix the super absorbent resin, the modification reinforcing agent and the rest water, adding the mixture A obtained in the step S1, soaking the mixture A, wherein the mixture A needs to be completely immersed in the solution, the indoor temperature is kept within 22 ℃ during soaking, and filtering the solution after continuously soaking for 2 hours to obtain a mixture B;
and S5, adding the mixed solution obtained in the S3 and the mixture B obtained in the 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.
Be used for carrying out the soak to mixture A in S4, soak device includes main part 1, the inboard of main part 1 is provided with cartridge filter 2, the equal fixed mounting in 1 outside both sides of organism has electric telescopic handle 3, electric telescopic handle 3' S bottom fixedly connected with supporting seat 4, the equal fixedly connected with roll wheel 5 in both sides of 1 bottom of organism, the middle intercommunication of 1 bottom of organism has drainage pipe 6, the equal fixed mounting in both sides of organism 1 has handle 7.
The filter cartridge 2 is evenly provided with round holes outside, which is convenient for separating solution from solid, and is clamped at the inner side of the machine body 1, and can be quickly separated from the inner side of the machine body 1, which is convenient for cleaning the machine body 1 and the filter cartridge 2, two electric telescopic rods 3 are respectively positioned at the bottom positions of the left side and the right side of the machine body 1, and are externally connected with a power supply, and the electric telescopic rods 3 are used for stretching and retracting, so that the supporting seat 4 can be moved, and further the machine body 1 can be moved in the vertical direction, two rolling wheels 5 are respectively arranged at the left side and the right side of the bottom of the machine body 1, which is convenient for moving the machine body 1, and when the electric telescopic rods 3 are not required to be moved, the supporting seat 4 is driven to be moved to be contacted with the ground through the electric telescopic rods 3, so as to provide stable support for the machine body 1, and the device can be kept in a stable state, and can be adjusted in height by controlling the electric telescopic rods 3 to stretch according to actual use requirements, the soaking device is convenient to move, the height of the soaking device can be adjusted according to use requirements, solid and liquid separation is convenient to realize, and the soaking device is very convenient and very flexible to use.
Second embodiment
Based on the first embodiment of the invention, a sponge city high-strength recycled aggregate concrete and a preparation method thereof, 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 hinder 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, and the difference is 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 reducing agent, 6 parts of super absorbent resin and 9 parts of modification reinforcing agent;
wherein the modification 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 boron trioxide, 6 parts of amino trimethylene phosphonate, 1 part of coupling agent and 15 parts of water;
the preparation method of the modification reinforcing agent comprises the following operation steps:
s1, uniformly mixing polyvinyl alcohol and boron 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 the coupling agent, stirring the three equal parts in the same direction, adding water with the same amount continuously after each part of the amino trimethylene phosphonate is added, standing for 8 minutes, continuously adding the next part of the amino trimethylene phosphonate until all the part of the amino trimethylene phosphonate is added, and cooling for 3 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 85 ℃, adding the rest water, slowly stirring, stopping heating after continuously stirring for 8 minutes, taking out and cooling to obtain the modification reinforcing agent.
The concentration of the water glass is 43 wt%, and the concentration of the polyvinyl alcohol is 33 wt%.
A preparation method of sponge city high-strength recycled aggregate concrete comprises the following operation steps:
s1, recycled aggregate treatment: firstly, breaking waste concrete blocks into blocks with the diameter and the length smaller than 60mm, and then sequentially carrying out moisture spraying, screening, crushing, strengthening, drying and collecting treatment on the block concrete to finally obtain strengthened recycled aggregate with the average particle size of 5-8 mm;
the reinforcing treatment of the aggregate in the S1 comprises the following operation steps:
s11, slowly adding water glass into the 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 the concrete particles into the mixture obtained in the S1, fully stirring and mixing, adding water with 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, putting the solid mixture obtained in the S2 into drying equipment, and continuously drying for 25 minutes at the temperature of 380 ℃ to dry the solid mixture to constant weight to obtain semi-finished aggregate;
and S14, 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 for 35 minutes at the temperature of 525 ℃, 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, slowly adding water with 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 revolutions per minute when the high-speed stirrer pre-stirs the raw materials, and the rotating speed is set to be 100 revolutions per minute after the water is added;
s3, uniformly mixing nano silicon dioxide, graphene oxide powder and half of polyacrylate, heating to 58 ℃, adding water with half of the total volume, continuously stirring until the temperature rises to 78 ℃, stopping heating, continuously adding the remaining half of polyacrylate, continuously stirring for 8 minutes, standing and cooling to a normal temperature state to obtain a mixed solution;
s4, sequentially adding the super absorbent resin, the modification reinforcing agent and the rest water into a soaking device, stirring to uniformly mix the super absorbent resin, the modification reinforcing agent and the rest water, adding the mixture A obtained in the step S1, soaking the mixture A into a solution, keeping the indoor temperature within 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 S3 and the mixture B obtained in the 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, a sponge city high-strength recycled aggregate concrete and a preparation method thereof, a 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 hinder 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, and the difference is that:
the feed 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 reducing agent, 8 parts of super absorbent resin and 12 parts of modification reinforcing agent;
wherein the modification 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 modification reinforcing agent comprises the following operation steps:
s1, uniformly mixing polyvinyl alcohol and boron 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 the coupling agent, stirring the three equal parts in the same direction, adding water with the same amount continuously after each part of the amino trimethylene phosphonate is added, standing the mixture for 10 minutes, continuously adding the next part of the amino trimethylene phosphonate until all the part of the amino trimethylene phosphonate is added, and cooling the mixture for 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 90 ℃, adding the rest water, slowly stirring, stopping heating after continuously stirring for 10 minutes, taking out and cooling to obtain the modified reinforcing agent.
The concentration of the water glass is 45 wt%, and the concentration of the polyvinyl alcohol is 36 wt%.
A preparation method of sponge city high-strength recycled aggregate concrete comprises the following operation steps:
s1, recycled aggregate treatment: firstly, breaking waste concrete blocks into blocks with the diameter and the length smaller than 60mm, and then sequentially carrying out moisture spraying, screening, crushing, strengthening, drying and collecting treatment on the block concrete to finally obtain strengthened recycled aggregate with the average particle size of 5-8 mm;
the reinforcing treatment of the aggregate in the S1 comprises the following operation steps:
s11, slowly adding water glass into the 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 the concrete particles into the mixture obtained in the S1, fully stirring and mixing, adding water with 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, putting the solid mixture obtained in the step S2 into drying equipment, and continuously drying for 30 minutes at the temperature of 400 ℃ to dry the solid mixture to constant weight to obtain semi-finished aggregate;
and S14, 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 for 40 minutes at the temperature of 550 ℃, 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, slowly adding water with 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 revolutions per minute when the high-speed stirrer pre-stirs the raw materials, and the rotating speed is set to be 110 revolutions per minute after the water is added;
s3, uniformly mixing nano silicon dioxide, graphene oxide powder and half of polyacrylate, heating to 60 ℃, adding water with half of the total volume, continuously stirring until the temperature rises to 80 ℃, stopping heating, continuously adding the remaining half of polyacrylate, continuously stirring for 10 minutes, standing and cooling to a normal temperature state to obtain a mixed solution;
s4, sequentially adding the super absorbent resin, the modification reinforcing agent and the rest water into a soaking device, stirring to uniformly mix the super absorbent resin, the modification reinforcing agent and the rest water, adding the mixture A obtained in the step S1, soaking the mixture A, wherein the mixture A needs to be completely immersed in the solution, the indoor temperature is kept within 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 S3 and the mixture B obtained in the S4 into a stirring device, continuously stirring for 15 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.
Fourth embodiment
Based on the first embodiment of the invention, a sponge city high-strength recycled aggregate concrete and a preparation method thereof, a 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 hinder 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, and the difference is that:
the feed 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 reducing agent, 4 parts of super absorbent resin and 12 parts of modification reinforcing agent;
wherein the modification 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 modification reinforcing agent comprises the following operation steps:
s1, uniformly mixing polyvinyl alcohol and boron 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 the coupling agent, stirring the three equal parts in the same direction, adding water with the same amount continuously after each part of the amino trimethylene phosphonate is added, standing for 5 minutes, continuously adding the next part of the amino trimethylene phosphonate until the three parts of the amino trimethylene phosphonate are completely added, and cooling for 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 ℃, adding the rest water, slowly stirring, stopping heating after continuously stirring for 10 minutes, taking out and cooling to obtain the modification reinforcing agent.
The concentration of the water glass is 40 wt%, and the concentration of the polyvinyl alcohol is 36 wt%.
A preparation method of sponge city high-strength recycled aggregate concrete comprises the following operation steps:
s1, recycled aggregate treatment: firstly, breaking waste concrete blocks into blocks with the diameter and the length smaller than 60mm, and then sequentially carrying out moisture spraying, screening, crushing, strengthening, drying and collecting treatment on the block concrete to finally obtain strengthened recycled aggregate with the average particle size of 5-8 mm;
the reinforcing treatment of the aggregate in the S1 comprises the following operation steps:
s11, slowly adding water glass into the 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 the concrete particles into the mixture obtained in the S1, fully stirring and mixing, adding water with 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, putting the solid mixture obtained in the S2 into drying equipment, and continuously drying for 30 minutes at the temperature of 350 ℃ to dry the solid mixture to constant weight to obtain semi-finished aggregate;
and S14, 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 for 40 minutes at the temperature of 500 ℃, 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, slowly adding water with 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 revolutions per minute when the high-speed stirrer pre-stirs the raw materials, and the rotating speed is set to be 110 revolutions per minute after the water is added;
s3, uniformly mixing nano silicon dioxide, graphene oxide powder and half of polyacrylate, heating to 55 ℃, adding water with half of the total volume, continuously stirring until the temperature rises to 80 ℃, stopping heating, continuously adding the remaining half of polyacrylate, continuously stirring for 5 minutes, standing and cooling to a normal temperature state to obtain a mixed solution;
s4, sequentially adding the super absorbent resin, the modification reinforcing agent and the rest water into a soaking device, stirring to uniformly mix the super absorbent resin, the modification reinforcing agent and the rest water, adding the mixture A obtained in the step S1, soaking the mixture A in a solution, keeping the indoor temperature within 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 S3 and the mixture B obtained in the 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.
Experimental comparisons were made on the water permeability, compressive strength, fatigue deformation modulus, bulk density, and softening coefficient of the high-strength recycled aggregate concrete for sponge cities prepared in examples 1 to 4, respectively, and in order to ensure the accuracy of the experiment, 100 groups of experimental subjects were randomly selected in each example, and the obtained data were represented by mean values, while for convenience of comparison, the data of all examples were normalized based on the data of example 1.
TABLE 1
| Water permeability | Compressive strength | Modulus of fatigue deformation resistance | Bulk density | Coefficient of softening | |
| Example 1 | 30.15％ | 41.23MPa | 1.34·104N/mm2 | 973ka/m3 | 0.931 |
| Example 2 | 33.12％ | 43.17MPa | 1.31·104N/mm2 | 988ka/m3 | 0.811 |
| Example 3 | 39.75％ | 40.68MPa | 1.40·104N/mm2 | 981ka/m3 | 0.921 |
| Example 4 | 31.23％ | 39.11MPa | 1.33·104N/mm2 | 979ka/m3 | 0.845 |
As can be seen from the above table, the sponge city high-strength recycled aggregate concrete prepared in example 2 and the preparation method thereof are the best choices because the water permeability, compressive strength, fatigue deformation modulus, bulk density and softening coefficient of the sponge city high-strength recycled aggregate concrete are all the best.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The high-strength recycled aggregate concrete for the sponge city is characterized by comprising the following raw materials in parts by weight:
800 parts of reinforced recycled coarse aggregate, 600 parts of cement, 100 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 a water reducing agent, 4-8 parts of super absorbent resin and 6-12 parts of a modification reinforcing agent;
wherein the modification 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 boron 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 modification reinforcing agent comprises the following operation steps:
s1, uniformly mixing polyvinyl alcohol and boron 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 the coupling agent, stirring the three equal parts in the same direction, adding water with the same amount continuously after each part of the amino trimethylene phosphonate is added, standing for 5-10 minutes, continuously adding the next part of the amino trimethylene phosphonate until all the part of the amino trimethylene phosphonate is 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, stopping heating after continuously stirring for 5-10 minutes, taking out, and cooling to obtain the modified reinforcing agent.
2. The sponge city high-strength recycled aggregate concrete according to claim 1, wherein the reinforced recycled coarse aggregate is 600 parts, the cement is 400 parts, the water is 100 parts, the steel slag powder is 50 parts, the limestone powder is 35 parts, the nano silica is 30 parts, the graphene oxide powder is 20 parts, the polyacrylate is 15 parts, the water glass is 10 parts, the water reducing agent is 5 parts, the super absorbent resin is 4 parts, and the modification reinforcing agent is 6 parts.
3. The sponge city high-strength recycled aggregate concrete according to claim 1, wherein the average particle size of the steel slag powder is 3.25-4.37mm, and the average particle size of the limestone powder is 2.64-3.82 μm.
4. The sponge city high-strength recycled aggregate concrete according to claim 1, characterized in that the water reducing agent is 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 combination of a plurality of polyacrylate, a starch acrylate polymer and a starch-acrylonitrile graft copolymer.
5. The sponge city high-strength recycled aggregate concrete according to claim 1, wherein the concentration of the water glass is 40-45 wt%, and the concentration of the polyvinyl alcohol is 30-36 wt%.
6. The preparation method of the sponge city high-strength recycled aggregate concrete is characterized by comprising the following operation steps:
s1, recycled aggregate treatment: firstly, breaking waste concrete blocks into blocks with the diameter and the length smaller than 60mm, and then sequentially carrying out moisture spraying, screening, crushing, strengthening, drying and collecting treatment on the block concrete to finally obtain strengthened recycled 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, slowly adding water with 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 half of polyacrylate, heating to 55-60 ℃, adding water with half of the total volume, continuously stirring until the temperature rises to 75-80 ℃, stopping heating, continuously adding the remaining 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 modification reinforcing agent and the rest water into a soaking device, stirring to uniformly mix, adding the mixture A obtained in the step S1, soaking the mixture A for 2-3 hours, and filtering out the solution to obtain a mixture B;
and S5, adding the mixed solution obtained in the S3 and the mixture B obtained in the S4 into a stirring device, continuously stirring for 10-15 minutes, sequentially adding water glass and a water reducing agent, and continuously stirring for 25-30 minutes to obtain the required high-strength recycled aggregate concrete.
7. The preparation method of the sponge city high-strength recycled aggregate concrete according to claim 6, wherein the step of reinforcing the aggregates in S1 comprises the following steps:
s1, slowly adding water glass into the nano calcium carbonate, fully stirring and mixing to obtain a mixture, continuously adding water with the volume 2-4 times that of the mixture, uniformly mixing, and standing for 3-5 hours;
s2, adding the concrete particles into the mixture obtained in the S1, fully stirring and mixing, adding water with 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 S2 into drying equipment, and continuously drying for 20-30 minutes at the temperature of 350-400 ℃ so that the solid mixture is dried to constant weight to obtain semi-finished aggregate;
s4, adding the water-soluble resin into a spraying device, uniformly spraying the water-soluble resin on the surface of the semi-finished aggregate obtained in the step S3, placing the semi-finished aggregate in a drying device after the spraying is finished, continuously drying for 30-40 minutes at the temperature of 500-550 ℃, taking out and cooling to obtain the reinforced recycled coarse aggregate.
8. The method for preparing high-strength recycled aggregate concrete for sponge cities as claimed in claim 6, wherein the high-speed mixer in S2 has a rotation speed of 110 and 120 rpm when pre-mixing the raw materials, and the rotation speed is set to 90-110 rpm after adding water.
9. The method for preparing high-strength recycled aggregate concrete for sponge cities as claimed in claim 6, wherein in the step S4, the mixture A is completely immersed in the solution during the soaking treatment of the mixture A, and the indoor temperature is kept within the range of 22-26 ℃.
10. The method for recycling high-strength aggregate concrete in a sponge city according to claim 6, wherein the soaking device used for soaking the mixture A in 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 both sides of the outer portion of the machine body, a supporting seat is fixedly connected to the bottom ends of the electric telescopic rods, rolling wheels are fixedly connected to both 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 both sides of the machine body.
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