CN114853413B - Self-compacting concrete capable of recycling solid waste and preparation method thereof - Google Patents
Self-compacting concrete capable of recycling solid waste and preparation method thereof Download PDFInfo
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- CN114853413B CN114853413B CN202210440095.3A CN202210440095A CN114853413B CN 114853413 B CN114853413 B CN 114853413B CN 202210440095 A CN202210440095 A CN 202210440095A CN 114853413 B CN114853413 B CN 114853413B
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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
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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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
- 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
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
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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
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/025—Belite cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
- C04B28/065—Calcium aluminosulfate cements, e.g. cements hydrating into ettringite
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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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- Organic Chemistry (AREA)
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- Inorganic Chemistry (AREA)
- Civil Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses self-compacting concrete for recycling solid wastes and a preparation method thereof, belonging to the technical field of building materials; the raw materials comprise 18-28wt% of cementing materials, 20-32wt% of recycled coarse aggregates, 24-30wt% of recycled fine aggregates, 5-10wt% of steel slag, 6-12wt% of modified attapulgite, 2.5-5wt% of plant fibers and 1-1.5wt% of water reducing agents; the modified attapulgite is prepared by soaking attapulgite in inorganic acid solution, soaking in sodium hydroxide and sodium silicate solution, loading, adsorbing, drying, and grinding; the recycled coarse aggregate and the recycled fine aggregate are both prepared from construction waste. According to the invention, the activity of the recycled coarse aggregate, the recycled fine aggregate and the steel slag is further activated and regulated through modification treatment of the common attapulgite, so that the hydration reaction processes of the early stage and the middle and later stages of the concrete are controlled; meanwhile, the fluidity of concrete slurry can be effectively controlled together with plant fibers and the like, and the good self-compacting effect of the concrete is ensured.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to self-compacting concrete for recycling solid wastes and a preparation method thereof.
Background
Self-compacting concrete refers to concrete which can flow and be compact under the action of self gravity, can completely fill a template even if compact steel bars exist, and simultaneously obtains good homogeneity without additional vibration/vibration. Compared with common concrete, the self-compacting concrete has good self-compacting effect, shortens the pouring time because no vibration is needed, but has very limited durability after hardening, especially in cold environment; the drying shrinkage is also slightly greater than that of ordinary coagulation. The self-compacting concrete is prepared by generally selecting and matching the additive, the cementing material and the coarse and fine aggregates, so that the yield stress of the concrete is reduced to be enough to be overcome by the shear stress generated by self weight, thereby increasing the fluidity of the concrete, simultaneously having enough plastic viscosity, leading the aggregates to be suspended in cement paste, avoiding the problems of segregation and bleeding, being capable of freely flowing and fully filling the space in a template, and forming a compact and uniform cementing structure.
At present, a large amount of construction waste generated by dismantling cannot be treated due to the self service life limitation of a building and the shortened construction and dismantling period. How to utilize the construction wastes to prepare the recycled coarse and fine aggregates to replace part of natural coarse and fine aggregates to be applied to the self-compacting concrete has very important practical significance.
In the prior art, for example, chinese patent application CN111018378A provides a method for preparing self-leveling self-compacting cement by blending industrial and construction waste, which comprises raw materials such as slag, non-fried, solid construction waste, coal ash, rice hull ash, silica fume and the like in addition to cement clinker, gypsum and water reducing agent. The finally obtained premixed concrete has good working performance, the 28d compressive strength is 37.7MPa, and the requirements of C30 concrete strength and working performance of the premixed concrete are met. For another example, chinese granted patent CN107382216B provides a high strength concrete doped with iron tailings and construction waste, the raw materials of which include a multi-element gelling system, iron tailings, stones, construction waste recycled aggregates and a water reducing agent, wherein the multi-element gelling system includes cement, fly ash, slag, silica fume and rice hull ash, and the iron tailings include tailings powder and tailings sand. However, the concrete prepared by the two patent technologies has good mechanical strength, but has general working performance and poor fluidity.
For example, the Chinese granted patent CN106278036B provides a high-strength self-compacting concrete, which comprises the raw materials of a cementing material, building waste recycled aggregate, sand, expanded vermiculite, a water reducing agent, a thickening agent, a thixotropic lubricant and straw fiber. The concrete has 28-day compressive strength up to 46MPa and slump expansion of 760mm. However, although the concrete is added with thickening materials such as straw fiber and a thickening agent, the slump expansion degree is still larger, and although the slump expansion degree is not obvious in the early stage of casting, the problems of segregation, bleeding and the like occur in the later stage of casting; concrete is prone to cracking and durability and strength are also affected.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a self-compacting concrete for recycling solid wastes and a preparation method thereof, and the self-compacting concrete is realized by the following technology.
The self-compacting concrete for recycling solid wastes comprises, by mass, 20-30% of a cementing material, 18-28% of a regenerated coarse aggregate, 20-32% of a regenerated coarse aggregate, 24-30% of a regenerated fine aggregate, 5-10% of steel slag, 6-12% of modified attapulgite, 2.5-5% of plant fibers and 1-1.5% of a water reducing agent;
the preparation method of the modified attapulgite comprises the following steps:
s1, taking attapulgite with the particle size of 4-8 mu m, soaking the attapulgite in 0.5-1mol/L aqueous solution of inorganic acid, and stirring for 5-10min; filtering to obtain filter residue, washing, and drying;
s2, weighing sodium hydroxide and sodium silicate to prepare a mixed aqueous solution, adding the attapulgite obtained in the step S1 into the mixed aqueous solution, and ultrasonically stirring; after drying, grinding to 6-10 μm particle size to obtain the modified attapulgite finished product;
the recycled coarse aggregate is construction waste recycled coarse aggregate, and the recycled fine aggregate is construction waste recycled fine aggregate.
The modified attapulgite provided by the invention is prepared by soaking common attapulgite in inorganic acid, soaking in sodium hydroxide and sodium silicate, stirring, ultrasonically drying, and grinding. Inside and the surface of the modified attapulgite all adsorb and load a large amount of sodium hydroxide and sodium silicate mixtures, when the modified attapulgite is used as the raw material of the self-compacting concrete, the modified attapulgite can regulate and control the release of the sodium hydroxide and the sodium silicate, and the modified attapulgite and the minerals in the steel slag, the regenerated coarse aggregate and the regenerated fine aggregate are subjected to the hydration reaction with controllable speed, and newly generated products can be uniformly distributed inside the concrete, so that the further improvement of the strength of the middle and later stages of the self-compacting concrete curing is ensured. The plant fiber, the recycled coarse aggregate, the recycled fine aggregate, the steel slag and the modified attapulgite form a grid structure through the new hydration product and the mutual physical action, and the self-compacting concrete slurry can be ensured to have more reasonable slump expansion degree, so that the problem of bleeding segregation caused by overhigh slump expansion degree is solved.
Preferably, in the preparation method of the modified attapulgite, the concentrations of the sodium hydroxide and the sodium silicate in the mixed aqueous solution in the step S2 are 0.5 to 1.5mol/L and 2.5 to 4.5mol/L, respectively, and the mass-to-volume ratio of the attapulgite to the mixed aqueous solution is 0.5 to 1g/L.
More preferably, in the preparation method of the modified attapulgite, the ultrasonic stirring manner in the step S2 is specifically: ultrasonic stirring at 1000-1500rpm for 2-3.5 hr with ultrasonic power of 300-600W.
Preferably, the recycled coarse aggregate and the recycled fine aggregate are prepared by crushing and grinding the construction waste respectively, then treating for 5-15min by using 1500-2500MHz and 15-45kW microwaves, and cooling to room temperature. Because different working environments have different requirements on the particle sizes of the coarse aggregate and the fine aggregate, the particle size after phase grinding can be selected according to specific actual requirements, and specific particle size parameters are not required to be specially specified. The construction waste is activated by microwaves, the electromagnetic energy is utilized to destroy chemical bonds of various compounds in the construction waste, and crystal water and structural water are removed, so that the molecular structure of the compounds is unstable, the compounds have gelatinization again, the crystalline phases of quartz and other substances are weakened, the latent hydraulicity is improved, and the synergistic reaction effect of the compounds and the modified attapulgite is promoted.
Preferably, the preparation method of the plant fiber comprises the following steps: cleaning crop straw (straw of plants such as corn, rice, wheat, etc.) and/or coconut fiber, drying, crushing to length of 1-2mm, soaking in 0.5-1mol/L aqueous solution of inorganic acid, and stirring for 3-5min; filtering, washing and drying for later use. The flexibility of the crop straws soaked in the inorganic acid dilute solution is remarkably improved, the binding capacity of the crop straws with other raw materials in concrete is further enhanced, and the working fluidity of concrete slurry can be adjusted to a certain degree.
Preferably, the cementitious material is cement; or comprises cement and at least one of fly ash, slag and silica fume. The cementing material is common special cement such as portland cement or sulphoaluminate cement, high belite cement and the like, and materials such as fly ash, slag, silica fume and the like can be added according to the conventional mixing amount to replace the cement to play the same cementing function.
Preferably, the aqueous solution of the inorganic acid is an aqueous solution of sulfuric acid, hydrochloric acid or nitric acid.
Preferably, the raw materials of the self-compacting concrete comprise, by mass, 23wt% of a cementing material, 26wt% of a recycled coarse aggregate, 28wt% of a recycled fine aggregate, 8wt% of steel slag, 10wt% of modified attapulgite, 3.5wt% of plant fiber and 1.5wt% of a water reducing agent.
The preparation method of the slurry of the self-compacting concrete comprises the steps of adding the steel slag and the water reducing agent into water to prepare a mixed solution, wherein the water-to-glue ratio is 0.25-0.3; and adding the cementing material, the recycled coarse aggregate, the recycled fine aggregate, the modified attapulgite and the plant fiber into the mixed solution, and uniformly stirring to prepare the slurry of the self-compacting concrete.
Compared with the prior art, the invention has the advantages that:
1. the invention carries out special modification treatment on the common attapulgite, so that the activity of the recycled coarse aggregate, the recycled fine aggregate and the steel slag can be further activated, and the activity of the recycled coarse aggregate, the recycled fine aggregate and the steel slag can be regulated and controlled, thereby controlling the hydration reaction process of the concrete at the early stage and the middle and later stages;
2. the invention uses the recycled coarse aggregate, the recycled fine aggregate, the steel slag, the modified attapulgite and the plant fiber which are prepared by a special method; through the interaction of the materials, the slump of concrete slurry is controlled on the premise that the water reducing agent and the water consumption are not changed greatly, the bleeding segregation is reduced, the effective flowing and compaction can be ensured, the template can be completely filled even if dense steel bars exist, and the good homogeneity is obtained.
Detailed Description
The technical solutions of the present invention will be described clearly and completely below, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The following examples and comparative examplesThe used cement is Huaxin P.O 42.5 portland cement; the construction waste used for the recycled coarse aggregate and the recycled fine aggregate is obtained by sorting, crushing and screening waste concrete containing broken bricks and mortar blocks, wherein particles with the particle size of 0.5-0.35 mm (fineness modulus of 2.3-3.0) are used for preparing the recycled fine aggregate, and particles with the particle size of 5-10mm are used for preparing the recycled coarse aggregate. The plant fiber is prepared by selecting rice straw as a raw material. The water reducing agent is a high-efficiency polycarboxylic acid water reducing agent. Attapulgite was purchased from Wuhan province. The steel slag is from Wu Steel group, has particle diameter not more than 0.1mm, and contains SiO as main component 2 27.53wt％、CaO 19.94wt％、Fe 2 O 3 15.42wt％、Al 2 O 3 9.69wt％、MgO 7.83wt％。
The self-compacting concrete of the following examples and comparative examples is prepared into slurry when in use, purified water is taken according to the water-to-gel ratio of 0.25, and the steel slag and the water reducing agent are added into the purified water and stirred to prepare mixed liquid; adding the cementing material, the regenerated coarse aggregate, the regenerated fine aggregate, the modified attapulgite (or the common attapulgite if not used) and the plant fiber into a stirrer, continuously stirring at the rotating speed of 48r/min, adding the mixed solution into the stirrer for 4 times, and stirring for 1min at 48r/min for each time; after the mixed solution is completely added, continuously stirring for 3min; preparing the self-compacting concrete slurry.
Example 1
The raw materials of the self-compacting concrete recycled from solid wastes provided by the embodiment comprise 23wt% of cement, 26wt% of recycled coarse aggregate, 28wt% of recycled fine aggregate, 8wt% of steel slag, 10wt% of modified attapulgite, 3.5wt% of plant fiber and 1.5wt% of water reducer.
The preparation method of the recycled coarse aggregate comprises the following steps: sorting, crushing and screening waste concrete particles with the particle size of 5-10mm, carrying out microwave treatment on the waste concrete particles for 8min at the frequency of 2000MHz and 30kW, and cooling to room temperature.
The preparation method of the recycled fine aggregate comprises the following steps: sorting, crushing and screening waste concrete particles with the particle size of 0.5mm-0.35mm, treating the waste concrete particles for 5min by using microwave of 1500MHz and 15kW, and cooling to room temperature to prepare the concrete.
The preparation method of the modified attapulgite comprises the following steps:
s1, taking attapulgite with the particle size of 4-8 mu m, soaking the attapulgite in 0.5mol/L diluted hydrochloric acid, and stirring for 10min; filtering to obtain filter residue, washing, and drying;
s2, weighing sodium hydroxide and sodium silicate to prepare a mixed water solution (the concentration of the sodium hydroxide and the sodium silicate is 1mol/L and 3mol/L, namely the mass ratio of the sodium hydroxide to the sodium silicate is 1; after drying, the modified attapulgite clay is prepared by grinding the raw materials to the particle size of 6-10 mu m.
The preparation method of the plant fiber comprises the following steps: cleaning rice straw stalks, drying, crushing to the length of 1-2mm, soaking in 0.5mol/L dilute hydrochloric acid, stirring for 3-5min, wherein the mass-volume ratio of the rice straw stalks to the dilute hydrochloric acid is 0.5kg/L, and the stirring speed is 200rpm; filtering, washing, and oven drying to obtain plant fiber.
Example 2
The self-compacting concrete recycled from solid wastes provided in this example is different from example 1 in that the raw materials include 18wt% of cement, 32wt% of recycled coarse aggregate, 24wt% of recycled fine aggregate, 10wt% of steel slag, 12wt% of modified attapulgite, 2.5wt% of plant fiber, and 1.5wt% of water reducing agent.
Example 3
The self-compacting concrete recycled from solid wastes provided in this example is different from example 1 in that the raw materials thereof include, by mass, 28wt% of cement, 22wt% of recycled coarse aggregate, 30wt% of recycled fine aggregate, 6wt% of steel slag, 7.5wt% of modified attapulgite, 5wt% of plant fiber, and 1.5wt% of a water reducing agent.
Example 4
The self-compacting concrete recycled from solid wastes provided in this example is different from example 1 in that the used cementitious material is composed of cement and fly ash, and the mass ratio of cement to fly ash is 4.
Comparative example 1
The self-compacting concrete for recycling solid wastes provided by the comparative example is different from the self-compacting concrete provided by the example 1 in that the modified attapulgite is replaced by the common attapulgite with the same particle size.
Comparative example 2
The self-compacting concrete for recycling solid wastes provided by the comparative example is different from the self-compacting concrete provided by the example 1 in that the plant fibers are directly made of common rice straw stalks.
Test example: performance testing of the self-compacting concretes of examples and comparative examples
And (3) preparing the self-compacting concrete of the embodiment and the comparative example into slurry, starting a stirrer to stir at the rotating speed of 48r/min for 1 minute, observing the fluidity of the mixture, and continuing to stir for 3mins after the additive is added in the last time to obtain the self-compacting composite concrete.
The prepared self-compacting composite concrete is made into a test block with the size of 100mm multiplied by 100mm, the test block is naturally cured for 28d, the test of the compressive strength and the splitting tensile strength is carried out according to the requirements of GB/T50081-2019 'test method standard of physical and mechanical properties of concrete', and the test of slump expansion, T500 and segregation rate is carried out according to GB/50080-2016 'test method standard of performance of common concrete mixture'. The test results are shown in table 1 below.
TABLE 1 self-compacting composite concrete Performance test results
From the above table 1, it can be seen that when the amount of each raw material of the self-compacting concrete is changed, the mechanical strength and the fluidity of the concrete are changed to some extent, but not much. When the common recycled coarse aggregate and the fine aggregate are used, the early, middle and later stage mechanical strength of the concrete is reduced.
When the ordinary attapulgite (comparative example 1) was used, the mechanical strength of the concrete was lowered, the fluidity was too strong, and the segregation rate was increased, similarly to the case where the attapulgite was treated with only dilute hydrochloric acid.
When ordinary straw stalks were used (comparative example 2), the flexibility of the straw stalks was deteriorated and the mechanical strength was lower than that of example 1, but the influence on the fluidity of concrete was not large.
The practice of the present invention has been described in detail with reference to the foregoing detailed description, but the invention is not limited to the specific details of the foregoing embodiment. Various simple modifications and changes can be made to the technical solution of the present invention within the scope of the claims and the technical idea of the present invention, and these simple modifications belong to the protection scope of the present invention.
Claims (7)
1. The self-compacting concrete for recycling solid wastes is characterized by comprising 18-28wt% of a cementing material, 20-32wt% of a recycled coarse aggregate, 24-30wt% of a recycled fine aggregate, 5-10wt% of steel slag, 6-12wt% of modified attapulgite, 2.5-5wt% of plant fiber and 1-1.5wt% of a water reducing agent;
the preparation method of the modified attapulgite comprises the following steps:
s1, taking attapulgite with the particle size of 4-8 mu m, soaking the attapulgite in 0.5-1mol/L aqueous solution of inorganic acid, and stirring for 5-10min; filtering to obtain filter residue, washing, and drying;
s2, weighing sodium hydroxide and sodium silicate to prepare a mixed aqueous solution, adding the attapulgite obtained in the step S1 into the mixed aqueous solution, and ultrasonically stirring; after drying, grinding to 6-10 μm particle size to obtain the modified attapulgite finished product;
the recycled coarse aggregate is recycled coarse aggregate of construction waste, and the recycled fine aggregate is recycled fine aggregate of construction waste, and is prepared by crushing and grinding the construction waste, performing microwave treatment on the crushed and ground construction waste for 5 to 15min at 1500 to 2500MHz and 15 to 45kW, and cooling the crushed and ground construction waste to room temperature;
the aqueous solution of the inorganic acid is aqueous solution of sulfuric acid, hydrochloric acid or nitric acid;
the preparation method of the plant fiber comprises the following steps: cleaning crop straws and/or coconut fibers, drying, crushing to a length of 1-2mm, soaking in 0.5-1mol/L aqueous solution of inorganic acid, and stirring for 3-5min; filtering, washing and drying for later use.
2. The self-compacting concrete for recycling solid wastes according to claim 1, wherein in the preparation method of the modified attapulgite, the concentrations of the sodium hydroxide and the sodium silicate in the mixed aqueous solution of the step S2 are 0.5-1.5mol/L and 2.5-4.5mol/L, respectively, and the mass-to-volume ratio of the attapulgite to the mixed aqueous solution is 0.5-1g/L.
3. The solid waste recycled self-compacting concrete according to claim 2, wherein in the preparation method of the modified attapulgite, the ultrasonic stirring mode in the step S2 is specifically as follows: ultrasonic stirring at 1000-1500rpm for 2-3.5 hr with ultrasonic power of 300-600W.
4. The solid waste recycled self-compacting concrete according to claim 1, wherein the cementitious material is cement.
5. The solid waste recycled self-compacting concrete according to claim 1, wherein the cementitious material is composed of at least one of fly ash, slag, silica fume, and cement.
6. The self-compacting concrete for recycling solid wastes according to any one of claims 1 to 5, wherein the raw materials comprise 23wt% of gelled material, 26wt% of recycled coarse aggregate, 28wt% of recycled fine aggregate, 8wt% of steel slag, 10wt% of modified attapulgite, 3.5wt% of vegetable fiber and 1.5wt% of water reducing agent.
7. The preparation method of the self-compacting concrete slurry as claimed in claim 1 or 2, characterized in that the steel slag and the water reducing agent are added into water to prepare a mixed solution, and the water-to-binder ratio is 0.25-0.3; and adding the cementing material, the recycled coarse aggregate, the recycled fine aggregate, the modified attapulgite and the plant fiber into the mixed solution, and uniformly stirring to prepare the slurry of the self-compacting concrete.
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