CN114163191B - Early-strength self-compacting concrete and preparation method thereof - Google Patents

Early-strength self-compacting concrete and preparation method thereof Download PDF

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CN114163191B
CN114163191B CN202111512876.0A CN202111512876A CN114163191B CN 114163191 B CN114163191 B CN 114163191B CN 202111512876 A CN202111512876 A CN 202111512876A CN 114163191 B CN114163191 B CN 114163191B
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mixing
stirring
beet pulp
uniformly
adsorbent
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CN114163191A (en
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许广森
俞建松
俞裕星
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Shenzhen Hengxing Building Material Co ltd
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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
    • 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
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/36—Inorganic materials not provided for in groups C04B14/022 and C04B14/04 - C04B14/34
    • 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
    • C04B18/04—Waste materials; Refuse
    • C04B18/18—Waste materials; Refuse organic
    • C04B18/24—Vegetable refuse, e.g. rice husks, maize-ear refuse; Cellulosic materials, e.g. paper, cork
    • C04B18/248—Vegetable refuse, e.g. rice husks, maize-ear refuse; Cellulosic materials, e.g. paper, cork from specific plants, e.g. hemp fibres
    • 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
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24—Macromolecular compounds
    • C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B24/2641—Polyacrylates; Polymethacrylates
    • 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
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24—Macromolecular compounds
    • C04B24/38—Polysaccharides or derivatives thereof
    • 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
    • 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
    • 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
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/0068—Ingredients with a function or property not provided for elsewhere in C04B2103/00
    • C04B2103/0078—Sorbent materials
    • 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
    • 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
    • C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
    • 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

Abstract

The application relates to the field of concrete, and particularly discloses early-strength self-compacting concrete and a preparation method thereof. The early-strength self-compacting concrete comprises the following components in parts by weight: 360-400 parts of cement, 550-590 parts of coarse aggregate, 560-600 parts of sand, 110-150 parts of admixture, 24-32 parts of additive, 150-180 parts of water and 100-140 parts of adsorbent, wherein the adsorbent comprises carboxyl functional acrylate emulsion, beet pulp fiber and adsorption powder, and the weight ratio of the carboxyl functional acrylate resin to the beet pulp fiber to the adsorption powder is (2-3). The application of early strong type self-compaction concrete can be used to bulky concrete structure body and pour, and it has the bulk concrete structure body that reduces and destroys to reduce the advantage to the influence of bulky concrete strength.

Description

Early-strength self-compacting concrete and preparation method thereof
Technical Field
The application relates to the field of concrete, in particular to early-strength self-compacting concrete and a preparation method thereof.
Background
Self-compacting concrete refers to concrete which can flow and 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. The self-compacting performance of the self-compacting concrete mainly comprises fluidity, segregation resistance and filling property.
In the related technology, the early strength type self-compacting concrete is prepared by adding an early strength agent on the basis of self-compacting concrete, and is prepared by adding water into cement, coarse aggregate, sand, water, the early strength agent and other components, mixing the mixture and then pumping the mixture into a template for pouring. The early-strength self-compacting concrete accelerates the hydration speed of cement by adding the early-strength agent, thereby promoting the development of the early strength of the concrete and leading the concrete to reach the preset strength in the early stage. Because bulky concrete is difficult for vibrating, consequently can choose for use this early strong type self-compaction concrete to pour.
In view of the above-described related art, the inventors found that: the temperature in the mass concrete rises due to hydrothermal liquefaction, so that ettringite in the mass concrete is decomposed, and after the temperature is reduced, the ettringite is regenerated, so that the mass concrete is expanded and damaged, and a mass concrete structure is damaged, so that the strength of the mass concrete is influenced.
Disclosure of Invention
In order to reduce the damage of a mass concrete structure and reduce the influence on the strength of the mass concrete, the application provides an early-strength self-compacting concrete and a preparation method thereof.
In a first aspect, the present application provides an early strength self-compacting concrete, which adopts the following technical scheme:
the early-strength self-compacting concrete comprises the following components in parts by weight: 360-400 parts of cement, 550-590 parts of coarse aggregate, 560-600 parts of sand, 110-150 parts of admixture, 24-32 parts of additive, 150-180 parts of water and 100-140 parts of adsorbent, wherein the adsorbent comprises carboxyl functional acrylate emulsion, beet pulp fiber and adsorption powder, and the weight ratio of the carboxyl functional acrylate resin to the beet pulp fiber to the adsorption powder is 2-3.
By adopting the technical scheme, the carboxyl functional acrylate emulsion adheres the adsorption powder into the beet pulp fiber, the adsorption powder is uniformly mixed with other components along with the beet pulp fiber, the early-strength self-compacting concrete is poured into a large-volume concrete structure body, a large amount of hydration heat is accumulated in the large-volume concrete structure body to be heated, and ettringite is heated and decomposed to form free Ca 2+ And SO 4 2- The carboxyl functional acrylate emulsion is simultaneously heated and solidified on the adsorption powder in the beet pulp fiber, and free Ca is used when the mass concrete is cooled 2+ And SO 4 2- The solidified carboxyl functional acrylate is blocked in the beet pulp fibers, so that the generation of ettringite is effectively reduced, the condition that a mass concrete structure is damaged is further reduced, and the influence on the strength of the mass concrete is reduced.
Preferably, the coarse aggregate is graded broken stone, and the grain size of the graded broken stone is 5-10 mm.
By adopting the technical scheme, the graded broken stone is selected for use, so that the clearance rate of the coarse aggregate can be effectively reduced, the self-compactness of the concrete is improved, the flowability is effectively improved by controlling the grain diameter of the graded broken stone, and the self-compactness of the concrete is further improved.
Preferably, the preparation method of the adsorbent comprises the following steps: stirring and mixing the adsorption powder and the beet pulp fiber uniformly; and soaking the mixture of the adsorption powder and the beet pulp fibers in the carboxyl functional acrylate emulsion to prepare the adsorbent.
By adopting the technical scheme, the adsorption powder and the beet pulp fiber are mixed and stirred, at the moment, the adsorption powder enters gaps of the beet pulp fiber, and the carboxyl functional acrylate emulsion improves the connection strength of the adsorption powder and the beet pulp fiber, thereby improving the stability of the adsorbent.
Preferably, the adsorption powder material comprises hydrotalcite and sodium alginate, and the weight ratio of the hydrotalcite to the sodium alginate is 3-5.
By adopting the technical scheme, hydrotalcite and sodium alginate decompose Ca generated by ettringite 2+ And SO 4 2- Adsorption is carried out, thereby effectively reducing free Ca 2+ And SO 4 2- When the mass concrete is cooled, free Ca is generated 2+ And SO 4 2- Therefore, the amount of ettringite produced is reduced, and the damage of the mass concrete structure is effectively reduced, thereby reducing the influence on the strength of the mass concrete.
Preferably, the beet pulp fiber is cooked and dried firstly and then mixed with the adsorption material.
By adopting the technical scheme, after the beet pulp fibers are steamed and dried, impurities in the beet pulp fibers are reduced, the structure is looser, the adsorption powder can easily enter the beet pulp fibers, the adsorption powder stored in the beet pulp fibers is effectively improved, and the free Ca is improved 2+ And SO 4 2- The amount of the blocking (2) further reduces the production of ettringite.
Preferably, the admixture comprises 8-10 wt% of fly ash, 2-4 wt% of silica fume and quartz powder.
By adopting the technical scheme, the addition of the admixture reduces the addition of cement, thereby reducing the hydration heat of concrete, further reducing the decomposition of ettringite, effectively reducing the regenerated ettringite and improving the volume stability of a large-volume concrete structure body.
Preferably, the admixture comprises an early strength agent and a water reducing agent.
By adopting the technical scheme, the early strength agent is added to improve the early strength of the concrete, and the water reducing agent is added to reduce the addition of water, so that the hydration heat of the concrete is reduced, and the volume stability of a large-volume concrete structure body is improved.
Preferably, the water is ice water.
By adopting the technical scheme, when the temperature in the large-volume concrete structure body rises, the ice water reduces the temperature in the large-volume concrete structure body, so that the decomposition and regeneration of ettringite are reduced, and the volume stability of the large-volume concrete structure body is improved.
In a second aspect, the present application provides a preparation method of an early strength self-compacting concrete, which adopts the following technical scheme: a preparation method of early-strength self-compacting concrete comprises the following steps: the early-strength self-compacting concrete is prepared by uniformly mixing and stirring the coarse aggregate, the sand, the cement, the admixture, the water and the admixture, adding the adsorbent, and uniformly mixing and stirring.
By adopting the technical scheme, the bulk concrete can be prepared by mixing the raw materials, the operation is simple, and the finished product is easy to obtain.
In summary, the present application has the following beneficial effects:
1. as the adsorption powder is adhered to the beet pulp fibers by adopting the carboxyl functional acrylate emulsion, the adsorption powder is uniformly stirred and mixed with other components along with the beet pulp fibers, the early strength type self-compacting concrete is poured into a large-volume concrete structure body, a large amount of hydration heat is accumulated in the large-volume concrete structure body to be heated, and ettringite is heated and decomposed to form free Ca 2+ And SO 4 2- The carboxyl functional acrylate emulsion is simultaneously heated and solidified on the adsorption powder in the beet pulp fiber, and free Ca is used when the mass concrete is cooled 2+ And SO 4 2- The cured carboxyl functional acrylate is blocked in the beet pulp fibers,therefore, the generation of ettringite is effectively reduced, the condition that the mass concrete structure is damaged is further reduced, and the influence on the strength of the mass concrete is reduced.
2. In the present application, ca produced by decomposing ettringite with hydrotalcite and sodium alginate is preferably used 2+ And SO 4 2- The adsorption is carried out, thereby reducing ettringite generated when the mass concrete structure is cooled, and further reducing damage to the mass concrete structure.
3. According to the method, the finished product can be prepared by simply stirring and mixing the raw materials, and the operation is simple.
Detailed Description
In the application, cement is portland cement, coarse aggregate is graded macadam, the weight ratio of the macadam with the particle size of 0-5 mm to the macadam with the particle size of 5-10 mm to the macadam with the particle size of 10-15 mm is 17. The water is drinking water. The carboxyl functional acrylate emulsion is prepared by stirring and mixing UVD5200 UV acrylate resin containing carboxyl functional groups, water, an emulsifier and a curing agent, wherein the weight ratio of the four components is 100.
The present application will be described in further detail with reference to examples.
Examples
Example 1
S1, stirring and mixing 10kg of hydrotalcite, 30kg of sodium alginate and 40kg of beet pulp fibers uniformly, and soaking a mixture of the hydrotalcite, the sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
s2, mixing 550kg of coarse aggregate, 360kg of cement, 560kg of sand, 80kg of fly ash, 20kg of silica fume and 10kg of lime powder, adding 150kg of water and 8kg of water reducing agent, stirring and mixing uniformly, adding 10kg of early strength agent and the adsorbent prepared in the S1, stirring and mixing uniformly to prepare the early strength self-compacting concrete.
Example 2
S1, stirring and mixing 10kg of hydrotalcite, 30kg of sodium alginate and 40kg of beet pulp fibers uniformly, and soaking the hydrotalcite, the sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
s2, mixing 570kg of coarse aggregate, 380kg of cement, 580kg of sand, 90kg of fly ash, 30kg of silica fume and 10kg of lime powder, adding 165kg of water and 10kg of water reducing agent, stirring and mixing uniformly, adding 18kg of early strength agent and the adsorbent prepared in the S1, stirring and mixing uniformly to prepare the early strength self-compacting concrete.
Example 3
S1, stirring and mixing 10kg of hydrotalcite, 40kg of sodium alginate and 40kg of beet pulp fibers uniformly, and soaking a mixture of the hydrotalcite, the sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
s2, mixing 570kg of coarse aggregate, 380kg of cement, 580kg of sand, 90kg of fly ash, 30kg of silica fume and 10kg of lime powder, adding 165kg of water and 10kg of water reducing agent, stirring and mixing uniformly, adding 18kg of early strength agent and the adsorbent prepared in the S1, stirring and mixing uniformly to prepare the early strength self-compacting concrete.
Example 4
S1, stirring and mixing 10kg of hydrotalcite, 50kg of sodium alginate and 40kg of beet pulp fibers uniformly, and soaking a mixture of the hydrotalcite, the sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
and S2, mixing 570kg of coarse aggregate, 380kg of cement, 580kg of sand, 90kg of fly ash, 30kg of silica fume and 10kg of lime powder, adding 165kg of water and 10kg of water reducing agent, uniformly stirring and mixing, adding 18kg of early strength agent and the adsorbent prepared in the S1, uniformly stirring and mixing to obtain the early strength self-compacting concrete.
Example 5
S1, stirring and mixing 10kg of hydrotalcite, 30kg of sodium alginate and 50kg of beet pulp fibers uniformly, and soaking the hydrotalcite, the sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
s2, mixing 570kg of coarse aggregate, 380kg of cement, 580kg of sand, 90kg of fly ash, 30kg of silica fume and 10kg of lime powder, adding 165kg of water and 10kg of water reducing agent, stirring and mixing uniformly, adding 18kg of early strength agent and the adsorbent prepared in the S1, stirring and mixing uniformly to prepare the early strength self-compacting concrete.
Example 6
S1, stirring and mixing 10kg of hydrotalcite, 40kg of sodium alginate and 50kg of beet pulp fibers uniformly, and soaking the hydrotalcite, the sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
s2, mixing 570kg of coarse aggregate, 380kg of cement, 580kg of sand, 90kg of fly ash, 30kg of silica fume and 10kg of lime powder, adding 165kg of water and 10kg of water reducing agent, stirring and mixing uniformly, adding 18kg of early strength agent and the adsorbent prepared in the S1, stirring and mixing uniformly to prepare the early strength self-compacting concrete.
Example 7
S1, stirring and mixing 10kg of hydrotalcite, 50kg of sodium alginate and 50kg of beet pulp fibers uniformly, and soaking a mixture of the hydrotalcite, the sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
s2, mixing 570kg of coarse aggregate, 380kg of cement, 580kg of sand, 90kg of fly ash, 30kg of silica fume and 10kg of lime powder, adding 165kg of water and 10kg of water reducing agent, stirring and mixing uniformly, adding 18kg of early strength agent and the adsorbent prepared in the S1, stirring and mixing uniformly to prepare the early strength self-compacting concrete.
Example 8
S1, stirring and mixing 10kg of hydrotalcite, 30kg of sodium alginate and 60kg of beet pulp fibers uniformly, and soaking a mixture of the hydrotalcite, the sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
and S2, mixing 570kg of coarse aggregate, 380kg of cement, 580kg of sand, 90kg of fly ash, 30kg of silica fume and 10kg of lime powder, adding 165kg of water and 10kg of water reducing agent, uniformly stirring and mixing, adding 18kg of early strength agent and the adsorbent prepared in the S1, uniformly stirring and mixing to obtain the early strength self-compacting concrete.
Example 9
S1, stirring and mixing 10kg of hydrotalcite, 40kg of sodium alginate and 60kg of beet pulp fibers uniformly, and soaking the hydrotalcite, the sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
s2, mixing 570kg of coarse aggregate, 380kg of cement, 580kg of sand, 90kg of fly ash, 30kg of silica fume and 10kg of lime powder, adding 165kg of water and 10kg of water reducing agent, stirring and mixing uniformly, adding 18kg of early strength agent and the adsorbent prepared in the S1, stirring and mixing uniformly to prepare the early strength self-compacting concrete.
Example 10
S1, stirring and mixing 10kg of hydrotalcite, 50kg of sodium alginate and 60kg of beet pulp fibers uniformly, and soaking a mixture of the hydrotalcite, the sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
and S2, mixing 570kg of coarse aggregate, 380kg of cement, 580kg of sand, 90kg of fly ash, 30kg of silica fume and 10kg of lime powder, adding 165kg of water and 10kg of water reducing agent, uniformly stirring and mixing, adding 18kg of early strength agent and the adsorbent prepared in the S1, uniformly stirring and mixing to obtain the early strength self-compacting concrete.
Example 11
S1, stirring and mixing 10kg of hydrotalcite, 40kg of sodium alginate and 50kg of beet pulp fibers uniformly, and soaking a mixture of the hydrotalcite, the sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
and S2, mixing 570kg of coarse aggregate, 380kg of cement, 580kg of sand, 90kg of fly ash, 30kg of silica fume and 10kg of lime powder, adding 150kg of water and 10kg of water reducing agent, stirring and mixing uniformly, adding 18kg of early strength agent and the adsorbent prepared in the S1, stirring and mixing uniformly to prepare the early strength self-compacting concrete.
Example 12
S1, stirring and mixing 10kg of hydrotalcite, 40kg of sodium alginate and 50kg of beet pulp fibers uniformly, and soaking the hydrotalcite, the sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
and S2, mixing 570kg of coarse aggregate, 380kg of cement, 580kg of sand, 90kg of fly ash, 30kg of silica fume and 10kg of lime powder, adding 180kg of water and 10kg of water reducing agent, uniformly stirring and mixing, adding 18kg of early strength agent and the adsorbent prepared in the S1, uniformly stirring and mixing to obtain the early strength self-compacting concrete.
Example 13
S1, stirring and mixing 10kg of hydrotalcite, 40kg of sodium alginate and 50kg of beet pulp fibers uniformly, and soaking a mixture of the hydrotalcite, the sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
and S2, mixing 570kg of coarse aggregate, 360kg of cement, 580kg of sand, 90kg of fly ash, 30kg of silica fume and 10kg of lime powder, adding 165kg of water and 10kg of water reducing agent, stirring and mixing uniformly, adding 18kg of early strength agent and the adsorbent prepared in the S1, stirring and mixing uniformly to prepare the early strength self-compacting concrete.
Example 14
S1, stirring and mixing 10kg of hydrotalcite, 40kg of sodium alginate and 50kg of beet pulp fibers uniformly, and soaking the hydrotalcite, the sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
and S2, mixing 570kg of coarse aggregate, 400kg of cement, 580kg of sand, 90kg of fly ash, 30kg of silica fume and 10kg of lime powder, adding 165kg of water and 10kg of water reducing agent, stirring and mixing uniformly, adding 18kg of early strength agent and the adsorbent prepared in the S1, stirring and mixing uniformly to prepare the early strength self-compacting concrete.
Example 15
S1, stirring and mixing 10kg of hydrotalcite, 40kg of sodium alginate and 50kg of beet pulp fibers uniformly, and soaking the hydrotalcite, the sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
s2, mixing 550kg of coarse aggregate, 380kg of cement, 580kg of sand, 90kg of fly ash, 30kg of silica fume and 10kg of lime powder, adding 165kg of water and 10kg of water reducing agent, stirring and mixing uniformly, adding 18kg of early strength agent and the adsorbent prepared in the S1, stirring and mixing uniformly to prepare the early strength self-compacting concrete.
Example 16
S1, stirring and mixing 10kg of hydrotalcite, 40kg of sodium alginate and 50kg of beet pulp fibers uniformly, and soaking a mixture of the hydrotalcite, the sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
and S2, mixing 590kg of coarse aggregate, 380kg of cement, 580kg of sand, 90kg of fly ash, 30kg of silica fume and 10kg of lime powder, adding 165kg of water and 10kg of water reducing agent, stirring and mixing uniformly, adding 18kg of early strength agent and the adsorbent prepared in the S1, stirring and mixing uniformly to prepare the early strength self-compacting concrete.
Example 17
S1, stirring and mixing 10kg of hydrotalcite, 40kg of sodium alginate and 50kg of beet pulp fibers uniformly, and soaking a mixture of the hydrotalcite, the sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
s2, mixing 570kg of coarse aggregate, 380kg of cement, 560kg of sand, 90kg of fly ash, 30kg of silica fume and 10kg of lime powder, adding 165kg of water and 10kg of water reducing agent, stirring and mixing uniformly, adding 18kg of early strength agent and the adsorbent prepared in the S1, stirring and mixing uniformly to prepare the early strength self-compacting concrete.
Example 18
S1, stirring and mixing 10kg of hydrotalcite, 40kg of sodium alginate and 50kg of beet pulp fibers uniformly, and soaking a mixture of the hydrotalcite, the sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
s2, mixing 570kg of coarse aggregate, 380kg of cement, 600kg of sand, 90kg of fly ash, 30kg of silica fume and 10kg of lime powder, adding 165kg of water and 10kg of water reducing agent, stirring and mixing uniformly, adding 18kg of early strength agent and the adsorbent prepared in the S1, stirring and mixing uniformly to prepare the early strength self-compacting concrete.
Example 19
S1, stirring and mixing 10kg of hydrotalcite, 40kg of sodium alginate and 50kg of beet pulp fibers uniformly, and soaking a mixture of the hydrotalcite, the sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
and S2, mixing 570kg of coarse aggregate, 380kg of cement, 580kg of sand, 80kg of fly ash, 20kg of silica fume and 10kg of lime powder, adding 165kg of water and 10kg of water reducing agent, uniformly stirring and mixing, adding 18kg of early strength agent and the adsorbent prepared in the S1, uniformly stirring and mixing to obtain the early strength self-compacting concrete.
Example 20
S1, stirring and mixing 10kg of hydrotalcite, 40kg of sodium alginate and 50kg of beet pulp fibers uniformly, and soaking a mixture of the hydrotalcite, the sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
and S2, mixing 570kg of coarse aggregate, 380kg of cement, 580kg of sand, 90kg of fly ash, 20kg of silica fume and 10kg of lime powder, adding 165kg of water and 10kg of water reducing agent, uniformly stirring and mixing, adding 18kg of early strength agent and the adsorbent prepared in the S1, uniformly stirring and mixing to obtain the early strength self-compacting concrete.
Example 21
S1, stirring and mixing 10kg of hydrotalcite, 40kg of sodium alginate and 50kg of beet pulp fibers uniformly, and soaking a mixture of the hydrotalcite, the sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
s2, mixing 570kg of coarse aggregate, 380kg of cement, 580kg of sand, 100kg of fly ash, 20kg of silica fume and 10kg of lime powder, adding 165kg of water and 10kg of water reducing agent, stirring and mixing uniformly, adding 18kg of early strength agent and the adsorbent prepared in the S1, stirring and mixing uniformly to prepare the early strength self-compacting concrete.
Example 22
S1, stirring and mixing 10kg of hydrotalcite, 40kg of sodium alginate and 50kg of beet pulp fibers uniformly, and soaking a mixture of the hydrotalcite, the sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
and S2, mixing 570kg of coarse aggregate, 380kg of cement, 580kg of sand, 80kg of fly ash, 30kg of silica fume and 10kg of lime powder, adding 165kg of water and 10kg of water reducing agent, uniformly stirring and mixing, adding 18kg of early strength agent and the adsorbent prepared in the S1, uniformly stirring and mixing to obtain the early strength self-compacting concrete.
Example 23
S1, stirring and mixing 10kg of hydrotalcite, 40kg of sodium alginate and 50kg of beet pulp fibers uniformly, and soaking the hydrotalcite, the sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
s2, mixing 570kg of coarse aggregate, 380kg of cement, 580kg of sand, 100kg of fly ash, 30kg of silica fume and 10kg of lime powder, adding 165kg of water and 10kg of water reducing agent, stirring and mixing uniformly, adding 18kg of early strength agent and the adsorbent prepared in the S1, stirring and mixing uniformly to prepare the early strength self-compacting concrete.
Example 24
S1, stirring and mixing 10kg of hydrotalcite, 40kg of sodium alginate and 50kg of beet pulp fibers uniformly, and soaking a mixture of the hydrotalcite, the sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
and S2, mixing 570kg of coarse aggregate, 380kg of cement, 580kg of sand, 80kg of fly ash, 40kg of silica fume and 10kg of lime powder, adding 165kg of water and 10kg of water reducing agent, uniformly stirring and mixing, adding 18kg of early strength agent and the adsorbent prepared in the S1, uniformly stirring and mixing to obtain the early strength self-compacting concrete.
Example 25
S1, stirring and mixing 10kg of hydrotalcite, 40kg of sodium alginate and 50kg of beet pulp fibers uniformly, and soaking a mixture of the hydrotalcite, the sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
and S2, mixing 570kg of coarse aggregate, 380kg of cement, 580kg of sand, 90kg of fly ash, 40kg of silica fume and 10kg of lime powder, adding 165kg of water and 10kg of water reducing agent, uniformly stirring and mixing, adding 18kg of early strength agent and the adsorbent prepared in the S1, uniformly stirring and mixing to obtain the early strength self-compacting concrete.
Example 26
S1, stirring and mixing 10kg of hydrotalcite, 40kg of sodium alginate and 50kg of beet pulp fibers uniformly, and soaking the hydrotalcite, the sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
s2, mixing 570kg of coarse aggregate, 380kg of cement, 580kg of sand, 100kg of fly ash, 40kg of silica fume and 10kg of lime powder, adding 165kg of water and 10kg of water reducing agent, stirring and mixing uniformly, adding 18kg of early strength agent and the adsorbent prepared in the S1, stirring and mixing uniformly to prepare the early strength self-compacting concrete.
Example 27
S1, stirring and mixing 10kg of hydrotalcite, 40kg of sodium alginate and 50kg of beet pulp fibers uniformly, and soaking a mixture of the hydrotalcite, the sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
and S2, mixing 570kg of coarse aggregate, 380kg of cement, 580kg of sand, 90kg of fly ash, 30kg of silica fume and 10kg of lime powder, adding 165kg of water and 8kg of water reducing agent, uniformly stirring and mixing, adding 16kg of early strength agent and the adsorbent prepared in the S1, uniformly stirring and mixing to obtain the early strength self-compacting concrete.
Example 28
S1, stirring and mixing 10kg of hydrotalcite, 40kg of sodium alginate and 50kg of beet pulp fibers uniformly, and soaking the hydrotalcite, the sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
and S2, mixing 570kg of coarse aggregate, 380kg of cement, 580kg of sand, 90kg of fly ash, 30kg of silica fume and 10kg of lime powder, adding 165kg of water and 8kg of water reducing agent, uniformly stirring and mixing, adding 18kg of early strength agent and the adsorbent prepared in the S1, uniformly stirring and mixing to obtain the early strength self-compacting concrete.
Example 29
S1, stirring and mixing 10kg of hydrotalcite, 40kg of sodium alginate and 50kg of beet pulp fibers uniformly, and soaking a mixture of the hydrotalcite, the sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
and S2, mixing 570kg of coarse aggregate, 380kg of cement, 580kg of sand, 90kg of fly ash, 30kg of silica fume and 10kg of lime powder, adding 165kg of water and 8kg of water reducing agent, uniformly stirring and mixing, adding 20kg of early strength agent and the adsorbent prepared in the S1, uniformly stirring and mixing to obtain the early strength self-compacting concrete.
Example 30
S1, stirring and mixing 10kg of hydrotalcite, 40kg of sodium alginate and 50kg of beet pulp fibers uniformly, and soaking a mixture of the hydrotalcite, the sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
and S2, mixing 570kg of coarse aggregate, 380kg of cement, 580kg of sand, 90kg of fly ash, 30kg of silica fume and 10kg of lime powder, adding 165kg of water and 10kg of water reducing agent, uniformly stirring and mixing, adding 16kg of early strength agent and the adsorbent prepared in the S1, uniformly stirring and mixing to obtain the early strength self-compacting concrete.
Example 31
S1, stirring and mixing 10kg of hydrotalcite, 40kg of sodium alginate and 50kg of beet pulp fibers uniformly, and soaking a mixture of the hydrotalcite, the sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
and S2, mixing 570kg of coarse aggregate, 380kg of cement, 580kg of sand, 90kg of fly ash, 30kg of silica fume and 10kg of lime powder, adding 165kg of water and 10kg of water reducing agent, stirring and mixing uniformly, adding 20kg of early strength agent and the adsorbent prepared in the S1, stirring and mixing uniformly to prepare the early strength self-compacting concrete.
Example 32
S1, stirring and mixing 10kg of hydrotalcite, 40kg of sodium alginate and 50kg of beet pulp fibers uniformly, and soaking the hydrotalcite, the sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
s2, mixing 570kg of coarse aggregate, 380kg of cement, 580kg of sand, 90kg of fly ash, 30kg of silica fume and 10kg of lime powder, adding 165kg of water and 12kg of water reducing agent, stirring and mixing uniformly, adding 16kg of early strength agent and the adsorbent prepared in the S1, stirring and mixing uniformly to prepare the early strength self-compacting concrete.
Example 33
S1, stirring and mixing 10kg of hydrotalcite, 40kg of sodium alginate and 50kg of beet pulp fibers uniformly, and soaking a mixture of the hydrotalcite, the sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
and S2, mixing 570kg of coarse aggregate, 380kg of cement, 580kg of sand, 90kg of fly ash, 30kg of silica fume and 10kg of lime powder, adding 165kg of water and 12kg of water reducing agent, uniformly stirring and mixing, adding 18kg of early strength agent and the adsorbent prepared in the S1, uniformly stirring and mixing to obtain the early strength self-compacting concrete.
Example 34
S1, stirring and mixing 10kg of hydrotalcite, 40kg of sodium alginate and 50kg of beet pulp fibers uniformly, and soaking a mixture of the hydrotalcite, the sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
and S2, mixing 570kg of coarse aggregate, 380kg of cement, 580kg of sand, 90kg of fly ash, 30kg of silica fume and 10kg of lime powder, adding 165kg of water and 12kg of water reducing agent, stirring and mixing uniformly, adding 20kg of early strength agent and the adsorbent prepared in the S1, stirring and mixing uniformly to prepare the early strength self-compacting concrete.
Example 35
The difference from example 6 is that the water used in S2 is ice water.
Example 36
The difference from the example 6 is that the beet pulp fiber in the S1 is mixed with hydrotalcite and sodium alginate after being steamed and dried.
Example 37
S1, stirring and mixing 50kg of hydrotalcite and 50kg of beet pulp fibers uniformly, and soaking the mixture of the hydrotalcite and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
and S2, mixing 570kg of coarse aggregate, 380kg of cement, 580kg of sand, 90kg of fly ash, 30kg of silica fume and 10kg of lime powder, adding 165kg of water and 12kg of water reducing agent, uniformly stirring and mixing, adding 20kg of early strength agent and the adsorbent prepared in the S1, uniformly stirring and mixing to obtain the early strength self-compacting concrete.
Example 38
S1, stirring and mixing 50kg of sodium alginate and 50kg of beet pulp fibers uniformly, and soaking the mixture of the sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
and S2, mixing 570kg of coarse aggregate, 380kg of cement, 580kg of sand, 90kg of fly ash, 30kg of silica fume and 10kg of lime powder, adding 165kg of water and 12kg of water reducing agent, stirring and mixing uniformly, adding 20kg of early strength agent and the adsorbent prepared in the S1, stirring and mixing uniformly to prepare the early strength self-compacting concrete.
Example 39
S1, stirring and mixing 10kg of hydrotalcite, 50kg of sodium alginate and 60kg of beet pulp fibers uniformly, and soaking a mixture of the hydrotalcite, the sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
and S2, mixing 590kg of coarse aggregate, 400kg of cement, 600kg of sand, 100kg of fly ash, 40kg of silica fume and 10kg of lime powder, adding 180kg of water and 12kg of water reducing agent, stirring and mixing uniformly, adding 20kg of early strength agent and the adsorbent prepared in the S1, stirring and mixing uniformly to prepare the early strength self-compacting concrete.
Comparative example
Comparative example 1
S1, stirring and mixing 10kg of hydrotalcite, 40kg of sodium alginate and 50kg of beet pulp fibers uniformly to prepare an adsorbent;
and S2, mixing 570kg of coarse aggregate, 380kg of cement, 580kg of sand, 90kg of fly ash, 30kg of silica fume and 10kg of lime powder, adding 165kg of water and 10kg of water reducing agent, uniformly stirring and mixing, adding 18kg of early strength agent and the adsorbent prepared in the S1, uniformly stirring and mixing to obtain the early strength self-compacting concrete.
Comparative example 2
S1, stirring and mixing 10kg of hydrotalcite, 40kg of sodium alginate and 20kg of carboxyl functional acrylate emulsion uniformly to prepare an adsorbent;
and S2, mixing 570kg of coarse aggregate, 380kg of cement, 580kg of sand, 90kg of fly ash, 30kg of silica fume and 10kg of lime powder, adding 165kg of water and 10kg of water reducing agent, uniformly stirring and mixing, adding 18kg of early strength agent and the adsorbent prepared in the S1, uniformly stirring and mixing to obtain the early strength self-compacting concrete.
Comparative example 3
S1, uniformly stirring and mixing 50kg of beet pulp fibers and 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
and S2, mixing 570kg of coarse aggregate, 380kg of cement, 580kg of sand, 90kg of fly ash, 30kg of silica fume and 10kg of lime powder, adding 165kg of water and 10kg of water reducing agent, uniformly stirring and mixing, adding 18kg of early strength agent and the adsorbent prepared in the S1, uniformly stirring and mixing to obtain the early strength self-compacting concrete.
Comparative example 4
570kg of coarse aggregate, 380kg of cement, 580kg of sand, 90kg of fly ash, 30kg of silica fume and 10kg of lime powder are mixed, 165kg of water and 10kg of water reducing agent are added and stirred and mixed uniformly, and 18kg of early strength agent and 20kg of carboxyl functional acrylate emulsion are added and stirred and mixed uniformly to prepare the early strength self-compacting concrete.
Comparative example 5
570kg of coarse aggregate, 380kg of cement, 580kg of sand, 90kg of fly ash, 30kg of silica fume and 10kg of lime powder are mixed, 165kg of water and 10kg of water reducing agent are added and stirred and mixed uniformly, and 18kg of early strength agent and 50kg of beet pulp fiber are added and stirred and mixed uniformly to prepare the early strength self-compacting concrete.
Comparative example 6
S1, uniformly stirring and mixing the mixture with 50kg of beet pulp fibers, and soaking the mixture of hydrotalcite, sodium alginate and the beet pulp fibers in 20kg of carboxyl functional acrylate emulsion to prepare an adsorbent;
s2, mixing 570kg of coarse aggregate, 380kg of cement, 580kg of sand, 90kg of fly ash, 30kg of silica fume and 10kg of lime powder, adding 165kg of water and 10kg of water reducing agent, stirring and mixing uniformly, adding 18kg of early strength agent, 10kg of hydrotalcite and 40kg of sodium alginate, stirring and mixing uniformly to obtain the early strength self-compacting concrete.
Comparative example 7
570kg of coarse aggregate, 380kg of cement, 580kg of sand, 90kg of fly ash, 30kg of silica fume and 10kg of lime powder are mixed, 165kg of water and 10kg of water reducing agent are added and stirred uniformly, 18kg of early strength agent is added and stirred uniformly to prepare the early strength self-compacting concrete.
TABLE 1 EXAMPLES 1 TO 39 AND COMPARATIVE EXAMPLES 1 TO 7 ingredient tables (kg)
Figure BDA0003405556110000121
Figure BDA0003405556110000131
Figure BDA0003405556110000141
Figure BDA0003405556110000151
Performance test
According to GB/T50081-2016 standard of mechanical property test method for common concrete, the early strength type self-compacting concrete prepared in examples 1-39 and comparative examples 1-7 is taken to prepare a standard test block, and the flexural strength and compressive strength of the standard test block cured for 28d are measured.
According to GB/T50081-2016 standard of mechanical property test method for common concrete, the early strength type self-compacting concrete prepared in examples 1-39 and comparative examples 1-7 is taken to prepare a standard test block, and the number of cracks in a unit area and the total cracking area in the unit area are measured 24 hours after concrete pouring.
TABLE 2 table for examining the properties of examples 1 to 39 and comparative examples 1 to 7
Figure BDA0003405556110000161
It can be seen by combining example 6 with comparative examples 1, 4 and 7 and by combining table 2 that after the hydrotalcite and sodium alginate are mixed with the beet pulp fiber, the compressive strength and crack resistance of the finally prepared concrete are both significantly improved by adding the carboxyl functional acrylate emulsion. The reason is that the adsorption powder is adhered to the beet pulp fiber by carboxyl functional acrylate emulsion, the adsorption powder is uniformly mixed with other components along with the beet pulp fiber, and ettringite is decomposed by heating to form free Ca 2+ And SO 4 2- The absorbent is adsorbed on the adsorption powder in the beet pulp fibers, thereby effectively reducing the generation of ettringite, further reducing the condition that a mass concrete structure is damaged, and reducing the influence on the strength of the mass concrete.
It can be seen from the combination of example 6 and comparative examples 2, 5 and 7 and table 2 that when beet pulp fibers are added to the mixture of carboxyl functional acrylate emulsion, hydrotalcite and sodium alginate, the compressive strength and crack resistance of the finally prepared concrete are both significantly improved because the carboxyl functional acrylate emulsion adheres the adsorption powder to the beet pulp fibers and ettringite is decomposed by heat to form free Ca 2+ And SO 4 2- Is adsorbed on the adsorption powder in the beet pulp fiber, thereby being blocked in the beet pulp fiber and effectively reducing the generation of ettringite.
It can be seen from the combination of example 6 and comparative examples 3, 6 and 7 and table 2 that when hydrotalcite and sodium alginate are added to the mixture of carboxyl functional acrylate emulsion and beet pulp fiber, the compressive strength and crack resistance of the finally prepared concrete are both significantly improved because the absorbed powder enters the beet pulp fiber and ettringite is decomposed by heat to form free Ca 2+ And SO 4 2- The carboxyl functional acrylate emulsion is heated and solidified simultaneously when being adsorbed on the adsorption powder in the beet pulp fiber, thereby dissociating Ca 2+ And SO 4 2- And the calcium sulfate is blocked in the beet pulp fibers, so that the generation of ettringite is effectively reduced.
It can be seen from the combination of examples 2-9 and table 2 that the compressive strength and crack resistance of concrete can be effectively improved by selecting the addition amounts of the carboxyl functional acrylate emulsion, the beet pulp fiber, the hydrotalcite and the sodium alginate.
It can be seen from the combination of examples 11-18 and Table 2 that the compressive strength and crack resistance of concrete can be effectively improved by selecting the addition amounts of water, coarse aggregate, cement and sand.
It can be seen from the combination of examples 19-26 and table 2 that the compressive strength and crack resistance of concrete can be effectively improved by selecting the addition amounts of fly ash, silica fume and quartz powder. The main reason is that the admixture is added to reduce the addition of cement, thereby reducing the hydration heat of concrete and further reducing the decomposition of ettringite, thereby effectively reducing the regenerated ettringite and improving the volume stability of a large-volume concrete structure body.
It can be seen from the combination of examples 27 to 34 and table 2 that the compressive strength and crack resistance of concrete can be effectively improved by selecting the addition amounts of the water reducing agent and the early strength agent. The main reason is that the addition of water reducing agent reduces the addition of water, thereby reducing the hydration heat of concrete and improving the volume stability of large-volume concrete structure.
It can be seen from the combination of example 6 and example 35 and table 2 that, when the temperature in the bulk concrete structure rises, the ice water lowers the temperature in the bulk concrete structure, thereby reducing the decomposition and regeneration of ettringite and effectively improving the stability of the bulk concrete structure.
It can be seen from the combination of example 6 and example 36 and table 2 that after the beet pulp fibers are steamed and dried, the impurities in the beet pulp fibers are reduced, the structure is looser, the adsorption powder can enter the beet pulp fibers more easily, the adsorption powder stored in the beet pulp fibers is effectively improved, and the free Ca is improved 2+ And SO 4 2- The amount of blocking of (a) further reduces ettringite production, thereby effectively improving the stability of the large-volume concrete structure.
It can be seen from the combination of examples 6, 37 and 38 and table 2 that the adsorption powder prepared by adjusting the ratio of hydrotalcite to sodium alginate can adsorb Ca2+ and SO42 "generated by the decomposition of ettringite, thereby reducing ettringite generated when a mass concrete structure is cooled, and further reducing damage to the mass concrete structure.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims (7)

1. The early-strength self-compacting concrete is characterized by comprising the following components in parts by weight: 360-400 parts of cement, 550-590 parts of coarse aggregate, 560-600 parts of sand, 110-150 parts of admixture, 24-32 parts of additive, 150-180 parts of water and 100-140 parts of adsorbent, wherein the adsorbent comprises carboxyl functional acrylate emulsion, beet pulp fiber and adsorption powder, and the weight ratio of the carboxyl functional acrylate resin to the beet pulp fiber to the adsorption powder is (2-3); the preparation method of the adsorbent comprises the following steps: stirring and mixing the adsorption powder and the beet pulp fiber uniformly; soaking the mixture of the adsorption powder and the beet pulp fiber in the carboxyl functional acrylate emulsion to prepare an adsorbent; the adsorption powder material comprises hydrotalcite and sodium alginate, and the weight ratio of the hydrotalcite to the sodium alginate is 3-5.
2. The early strength self-compacting concrete according to claim 1, wherein the coarse aggregate is graded crushed stone, and the grain size of the graded crushed stone is 5-10 mm.
3. The early strength self-compacting concrete according to claim 1, wherein the beet pulp fibers are cooked and dried before being mixed with the adsorbent material.
4. The early strength self-compacting concrete according to claim 1, wherein the admixture comprises 8-10% by weight of fly ash, 2-4% by weight of silica fume and quartz powder.
5. The early strength self-compacting concrete according to claim 1, wherein the admixture comprises an early strength agent and a water reducing agent.
6. The early strength self-compacting concrete according to claim 1, wherein the water is ice water.
7. The method for preparing the early strength self-compacting concrete according to any one of claims 1-6, comprising the steps of: the early-strength self-compacting concrete is prepared by uniformly mixing and stirring the coarse aggregate, the sand, the cement, the admixture, the water and the admixture, adding the adsorbent, and uniformly mixing and stirring.
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