CN111533479A - Concrete admixture, preparation method thereof and concrete target direction regulating and controlling method - Google Patents

Concrete admixture, preparation method thereof and concrete target direction regulating and controlling method Download PDF

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Publication number
CN111533479A
CN111533479A CN202010488571.XA CN202010488571A CN111533479A CN 111533479 A CN111533479 A CN 111533479A CN 202010488571 A CN202010488571 A CN 202010488571A CN 111533479 A CN111533479 A CN 111533479A
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agent
admixture
concrete
water
slump
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李益群
庄合理
刘美
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Qingdao Guojiyi New Technology Co ltd
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Qingdao Guojiyi New Technology 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
    • 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
    • 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
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention is suitable for the technical field of concrete, and provides a concrete admixture, a preparation method and application thereof and concrete, wherein the concrete admixture comprises a slump retaining admixture and a water reducing admixture; the slump loss resistant additive comprises the following components in percentage by weight: 0.05-2% of sodium gluconate, 1-5% of a water reducing agent, 20-30% of a slump retaining agent, 0.01-0.05% of an air entraining agent, 0.03-0.08% of a defoaming agent and the balance of water; the water-reducing admixture comprises the following components in percentage by weight: 0.05-2% of sodium gluconate, 17-27% of a water reducing agent, 1-5% of a slump retaining agent, 0.01-0.05% of an air entraining agent, 0.03-0.08% of a defoaming agent and the balance of water. The concrete admixture provided by the invention can be subjected to double-doped or multi-doped targeted adjustment, so that the quality of concrete can be accurately controlled.

Description

Concrete admixture, preparation method thereof and concrete target direction regulating and controlling method
Technical Field
The invention belongs to the technical application of concrete, and particularly relates to a concrete admixture, a preparation method thereof and a concrete target direction regulating and controlling method.
Background
The concrete admixture is usually an admixture which takes polycarboxylic acid molecules as main components and is added in the process of mixing concrete to improve the performance of the concrete, and the adding amount is generally not more than 5 percent of the mass of cement. The concrete admixture is the foundation of modern high-strength, high-performance and high-durability concrete and is the soul of the modern concrete. Concrete admixtures are classified into four categories according to main functions: A. additive for improving rheological property of concrete mixture. B. The concrete setting time and hardening performance are adjusted. Comprises retarder and early strength agent. C. An additive for improving the durability of concrete. Including air entraining agents, rust inhibitors, and the like. D. And (3) an additive for improving other properties of concrete. Comprises air entraining agent, expanding agent, antifreezing agent and waterproof agent.
In order to meet the requirements of common concrete for the above additives, engineers in the concrete additive industry usually compound two or more of the above additives into an additive for use in concrete mixing plants according to the adaptability of the concrete with C30 beam-slab-column. The admixture is used for concrete of various types, strength grades, construction positions and transportation distances of concrete mixing stations, raw materials with different mud powder contents, adaptability and particle specific surface areas and raw material combinations of different types.
However, different kinds of concrete, strength grades, construction sites, transportation distances, etc. need to be matched with different kinds of additives; different raw materials of the same kind have different mud powder content, adaptability and particle specific surface area, and different kinds of additives also need to be matched; different raw materials need to be matched with different additives in water absorption, gradation and mixing ratio. The mixing ratio of the additives is as follows: the concrete additive has different water reducing rates, different slump retaining properties, different retarding properties, different air contents, different early strength properties and the like, and the existing concrete industry adopts one additive to solve all the change problems, which is obviously impossible. At present, because concrete companies use additives with fixed water reducing components, slump retaining components, retarding components and early strength antifreezing components, when various factors of concrete change, the problems can be solved only by adjusting the mixing amount of the additives, but the proportions of the slump retaining components, the water reducing components, the retarding components and the like of the additives cannot be changed all the time, so that the additives and the components of the concrete cannot be accurately matched all the time, only the total mixing amount of the additives can be adjusted, and the problems of uncontrollable delivery construction performance, large field arrival workability, high manufacturing cost, low strength and poor durability are caused. Therefore, the concrete admixture at present is seriously mismatched with various components of concrete which changes from time to time, which brings great inconvenience to actual work and has serious unscientific property.
Disclosure of Invention
The embodiment of the invention aims to provide a concrete admixture for dynamic target regulation of concrete, and aims to solve the problems in the background art.
The embodiment of the invention is realized by the concrete admixture, which comprises but is not limited to a slump retaining admixture and a water reducing admixture; the slump loss resistant additive comprises the following components in percentage by weight: 0.1-5% of sodium gluconate, 1-5% of a water reducing agent, 20-30% of a slump retaining agent, 0.01-0.08% of an air entraining agent, 0.03-0.1% of a defoaming agent and the balance of water, wherein the sum of the weight percentages of the components is 100%; the water-reducing admixture comprises the following components in percentage by weight: 0.1-5% of sodium gluconate, 17-27% of a water reducing agent, 1-5% of a slump retaining agent, 0.01-0.08% of an air entraining agent, 0.03-0.1% of a defoaming agent and the balance of water, wherein the sum of the weight percentages of the components is 100%.
Preferably, the slump-retaining additive comprises the following components in percentage by weight: 1-2% of sodium gluconate, 2-3% of a water reducing agent, 23-26% of a slump retaining agent, 0.02-0.04% of an air entraining agent, 0.04-0.06% of a defoaming agent and the balance of water, wherein the sum of the weight percentages of the components is 100%; the water-reducing admixture comprises the following components in percentage by weight: 1-2% of sodium gluconate, 20-23% of a water reducing agent, 2-3% of a slump retaining agent, 0.02-0.04% of an air entraining agent, 0.04-0.06% of a defoaming agent and the balance of water, wherein the sum of the weight percentages of the components is 100%.
Preferably, the water reducing agent is a polycarboxylic acid type water reducing agent; the slump retaining agent is a polycarboxylic acid type slump retaining agent.
Wherein the polycarboxylic acid type water reducing agent is a high-molecular copolymer mainly comprising acrylic acid and polyoxyethylene ether, and mainly has the water reducing effect; the polycarboxylic acid type slump retaining agent is a high-molecular copolymer mainly comprising acrylic acid, hydroxyethyl ester and polyoxyethylene ether, and mainly has a slump retaining effect.
Preferably, the air entraining agent is an anionic surface active air entraining agent.
Preferably, the antifoaming agent is an acetylene glycol type antifoaming agent.
Another object of an embodiment of the present invention is to provide a method for preparing the concrete admixture, which comprises the following steps:
weighing sodium gluconate, a water reducing agent, a slump retaining agent, an air entraining agent, a defoaming agent and water according to the weight percentage of each component in the slump retaining additive, and mixing the components to obtain the slump retaining additive;
weighing sodium gluconate, a water reducing agent, a slump retaining agent, an air entraining agent, a defoaming agent and water according to the weight percentage of each component in the water reducing admixture, and mixing the components to obtain the water reducing admixture;
and dynamically matching the slump-retaining admixture with the water-reducing admixture to obtain the concrete admixture.
Another object of the embodiments of the present invention is to provide a concrete admixture obtained by the above-mentioned preparation method.
It is another object of the embodiments of the present invention to provide a dynamic application of the above concrete admixture in concrete quality control.
Another object of an embodiment of the present invention is to provide a method for controlling a concrete target by using the concrete admixture, which comprises the following steps:
determining the blending proportion of the slump-retaining admixture and the water-reducing admixture according to the type of concrete to be regulated;
and dynamically matching the slump-retaining admixture and the water-reducing admixture with the concrete to be regulated according to the blending proportion of the slump-retaining admixture and the water-reducing admixture to obtain the concrete with the quality controlled by targeted regulation.
It is another object of an embodiment of the present invention to provide a concrete comprising the above concrete admixture.
The concrete admixture provided by the embodiment of the invention comprises but is not limited to a slump retaining admixture and a water reducing admixture; wherein, the slump retaining admixture has low initial water reducing rate and excellent slump retaining performance; the water reducing admixture has high initial water reducing rate and poor slump retaining performance; aiming at the requirements of concrete with different types, strength grades, construction positions, transportation distances, raw material mud powder amount, adaptability, particle specific surface area, raw material water absorption, gradation, mixing ratio and the like on performances such as different water reducing rates, different slump retaining performances, different retardation performances and the like, the slump retaining additive and the water reducing additive in the concrete additive can be mixed into the concrete in a double-mixing or multi-mixing manner to realize targeted adjustment. When the type of the concrete changes, the performance requirement of the concrete can be met by adjusting the mixing amount of the slump retaining admixture and the water reducing admixture, the performance requirement of the concrete can be met by adjusting the combination proportion of the slump retaining admixture and the water reducing admixture, the quality of the concrete can be controlled accurately, the concrete with various strength grades and different characteristics has similar ex-situ and in-situ construction performance, the quality control is greatly facilitated, the abrasion of equipment is reduced, the ex-situ concrete delivery quality can be directionally adjusted, the in-situ concrete loss is controlled, the workability of the concrete is optimized, the manufacturing cost is reduced, the durability is improved, and the like.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
This embodiment provides a concrete admixture comprising a slump retaining admixture and a water reducing admixture; specifically, the slump retaining additive is formed by mixing 0.1kg of sodium gluconate, 1kg of water reducing agent, 20kg of slump retaining agent, 0.01kg of air entraining agent, 0.03kg of defoaming agent and 78.86kg of water; the water reducing admixture is formed by mixing 0.1kg of sodium gluconate, 17kg of water reducing agent, 1kg of slump retaining agent, 0.01kg of air entraining agent, 0.03kg of defoaming agent and 81.86kg of water. Wherein the water reducing agent is a polycarboxylic acid type water reducing agent sold in the market, and specifically can be a V2 water reducing agent from the national science and technology group of Qingdao, and the water reducing rate can reach more than 40%; the slump retaining agent is a polycarboxylic acid type slump retaining agent sold in the market, specifically a V3 slump retaining agent from the national base science and technology group of Qingdao, and the water reduction rate of the slump retaining agent is lower than 20%; the air entraining agent is a commercially available anionic surface active air entraining agent, specifically can be an AE-601 anionic surface active air entraining agent from national science and technology group of Qingdao, and specifically can be an AE-601 anionic surface active air entraining agent from national science and technology group of Qingdao; the defoaming agent is a commercially available acetylene glycol type defoaming agent. In actual use, the slump retaining admixture and the water reducing admixture can be mixed together in advance and then added into concrete for uniform stirring; the slump retaining admixture and the water reducing admixture can also be respectively added into the concrete to be uniformly stirred.
Example 2
This embodiment provides a concrete admixture comprising a slump retaining admixture and a water reducing admixture; specifically, the slump retaining additive is formed by mixing 5kg of sodium gluconate, 5kg of water reducing agent, 30kg of slump retaining agent, 0.08kg of air entraining agent, 0.1kg of defoaming agent and 59.82kg of water; the water reducing admixture is prepared by mixing 5kg of sodium gluconate, 27kg of water reducing agent, 5kg of slump retaining agent, 0.08kg of air entraining agent, 0.1kg of defoaming agent and 62.82kg of water. Wherein the water reducing agent is a polycarboxylic acid type water reducing agent sold in the market, and specifically can be a V2 water reducing agent from the national science and technology group of Qingdao, and the water reducing rate can reach more than 40%; the slump retaining agent is a polycarboxylic acid type slump retaining agent sold in the market, specifically a V3 slump retaining agent from the national base science and technology group of Qingdao, and the water reduction rate of the slump retaining agent is lower than 20%; the air entraining agent is a commercially available anionic surface active air entraining agent, and specifically can be an AE-601 anionic surface active air entraining agent from national science and technology group of Qingdao; the defoaming agent is a commercially available acetylene glycol type defoaming agent.
Example 3
This embodiment provides a concrete admixture comprising a slump retaining admixture and a water reducing admixture; specifically, the slump retaining additive is formed by mixing 1.5kg of sodium gluconate, 2kg of water reducing agent, 22kg of slump retaining agent, 0.02kg of air entraining agent, 0.04kg of defoaming agent and 74.44kg of water; the water reducing admixture is formed by mixing 1kg of sodium gluconate, 25kg of water reducing agent, 2kg of slump retaining agent, 0.04kg of air entraining agent, 0.06kg of defoaming agent and 71.9kg of water. Wherein the water reducing agent is a polycarboxylic acid type water reducing agent sold in the market, and specifically can be a V2 water reducing agent from the national science and technology group of Qingdao, and the water reducing rate can reach more than 40%; the slump retaining agent is a polycarboxylic acid type slump retaining agent sold in the market, specifically a V3 slump retaining agent from the national base science and technology group of Qingdao, and the water reduction rate of the slump retaining agent is lower than 20%; the air entraining agent is a commercially available anionic surface active air entraining agent, and specifically can be an AE-601 anionic surface active air entraining agent from national science and technology group of Qingdao; the defoaming agent is a commercially available acetylene glycol type defoaming agent.
Example 4
This embodiment provides a concrete admixture comprising a slump retaining admixture and a water reducing admixture; specifically, the slump retaining additive is formed by mixing 1kg of sodium gluconate, 4kg of water reducing agent, 28kg of slump retaining agent, 0.04kg of air entraining agent, 0.07kg of defoaming agent and 67.79kg of water; the water reducing admixture is formed by mixing 1.8kg of sodium gluconate, 18kg of water reducing agent, 3kg of slump retaining agent, 0.02kg of air entraining agent, 0.04kg of defoaming agent and 77.14kg of water. Wherein the water reducing agent is a polycarboxylic acid type water reducing agent sold in the market, and specifically can be a V2 water reducing agent from the national science and technology group of Qingdao, and the water reducing rate can reach more than 40%; the slump retaining agent is a polycarboxylic acid type slump retaining agent sold in the market, specifically a V3 slump retaining agent from the national base science and technology group of Qingdao, and the water reduction rate of the slump retaining agent is lower than 20%; the air entraining agent is a commercially available anionic surface active air entraining agent, and specifically can be an AE-601 anionic surface active air entraining agent from national science and technology group of Qingdao; the defoaming agent is a commercially available acetylene glycol type defoaming agent.
Example 5
This embodiment provides a concrete admixture comprising a slump retaining admixture and a water reducing admixture; specifically, the slump retaining additive is formed by mixing 1.2kg of sodium gluconate, 3kg of water reducing agent, 26kg of slump retaining agent, 0.04kg of air entraining agent, 0.06kg of defoaming agent and 69.7kg of water; the water reducing admixture is formed by mixing 2kg of sodium gluconate, 20kg of water reducing agent, 2kg of slump retaining agent, 0.02kg of air entraining agent, 0.04kg of defoaming agent and 75.94kg of water. Wherein the water reducing agent is a polycarboxylic acid type water reducing agent sold in the market, and specifically can be a V2 water reducing agent from the national science and technology group of Qingdao, and the water reducing rate can reach more than 40%; the slump retaining agent is a polycarboxylic acid type slump retaining agent sold in the market, specifically a V3 slump retaining agent from the national base science and technology group of Qingdao, and the water reduction rate of the slump retaining agent is lower than 20%; the air entraining agent is a commercially available anionic surface active air entraining agent, and specifically can be an AE-601 anionic surface active air entraining agent from national science and technology group of Qingdao; the defoaming agent is a commercially available acetylene glycol type defoaming agent.
Example 6
This embodiment provides a concrete admixture comprising a slump retaining admixture and a water reducing admixture; specifically, the slump retaining additive is formed by mixing 2kg of sodium gluconate, 2kg of water reducing agent, 23kg of slump retaining agent, 0.02kg of air entraining agent, 0.04kg of defoaming agent and 72.94kg of water; the water reducing admixture is formed by mixing 1.2kg of sodium gluconate, 23kg of water reducing agent, 3kg of slump retaining agent, 0.04kg of air entraining agent, 0.06kg of defoaming agent and 77.86kg of water. Wherein the water reducing agent is a polycarboxylic acid type water reducing agent sold in the market, and specifically can be a V2 water reducing agent from the national science and technology group of Qingdao, and the water reducing rate can reach more than 40%; the slump retaining agent is a polycarboxylic acid type slump retaining agent sold in the market, specifically a V3 slump retaining agent from the national base science and technology group of Qingdao, and the water reduction rate of the slump retaining agent is lower than 20%; the air entraining agent is a commercially available anionic surface active air entraining agent, and specifically can be an AE-601 anionic surface active air entraining agent from national science and technology group of Qingdao; the defoaming agent is a commercially available acetylene glycol type defoaming agent.
Example 7
This embodiment provides a concrete admixture comprising a slump retaining admixture and a water reducing admixture; specifically, the slump retaining additive is formed by mixing 1kg of sodium gluconate, 2.44kg of water reducing agent, 24.32kg of slump retaining agent, 0.03kg of air entraining agent, 0.05kg of defoaming agent and 72.16kg of water; the water reducing admixture is formed by mixing 1kg of sodium gluconate, 21.95kg of water reducing agent, 2.7kg of slump retaining agent, 0.03kg of air entraining agent, 0.05kg of defoaming agent and 74.27kg of water. Wherein the water reducing agent is a polycarboxylic acid type water reducing agent sold in the market, and specifically can be a V2 water reducing agent from the national science and technology group of Qingdao, and the water reducing rate can reach more than 40%; the slump retaining agent is a polycarboxylic acid type slump retaining agent sold in the market, specifically a V3 slump retaining agent from the national base science and technology group of Qingdao, and the water reduction rate of the slump retaining agent is lower than 20%; the air entraining agent is a commercially available anionic surface active air entraining agent, specifically can be an AE-601 anionic surface active air entraining agent from national science and technology group of Qingdao, and specifically can be an AE-601 anionic surface active air entraining agent from national science and technology group of Qingdao; the defoaming agent is a commercially available acetylene glycol type defoaming agent.
In another embodiment of the present invention, there is also provided a use of the concrete admixture provided in the above embodiment in quality control of concrete, specifically, the method may include the following steps:
s1, determining the mixing proportion of the slump-retaining admixture and the water-reducing admixture according to the type of the concrete to be regulated; wherein, the raw material mud powder amount, adaptability, particle specific surface area, raw material water absorption, gradation, mixing ratio and the like need to be matched; the type of concrete to be regulated includes, but is not limited to, species, strength grade, construction site, transport distance, and the like.
S2, dynamically matching the slump-retaining admixture and the water-reducing admixture with the concrete to be regulated according to the mixing proportion of the slump-retaining admixture and the water-reducing admixture to obtain the concrete after targeted regulation and quality control.
The concrete admixture as described above can be practically used by referring to the following examples.
Example 8
This example provides a concrete, which is C30 concrete for a wall stud consisting of 238kg of cement (f)ce=48MPa，ρ=3.2g/cm3) 84kg of mineral powder (the activity index is more than or equal to 95 percent in 28 days, and the rho =2.75 g/cm)3) 72kg of fly ash (the activity index is more than or equal to 70% in 28 days, and rho =2.1 g/cm)3) 413kg of fine sand (. mu.g)f=1.6，Ab=1.0，Wc=8.0，Ag=0.22，ρ=3g/cm3) 732kg of coarse sand (. mu.g)f=3.1，Ab=1.0，Wc=4.5，Ag=21.60，ρ=2.9g/cm3) 748kg of cobblestone (Gr = 10-25, Ab =0.5, W)c=0.0，ρ=2.75g/cm3) 175kg of waterStirring and mixing; the concrete is also added with the concrete admixture provided by the embodiment 7, and specifically, the addition amounts of the slump retaining admixture and the water reducing admixture are respectively 0.7 percent and 1.7 percent of the concrete; the combined modulus of the above-mentioned sand composition was 2.56.
Example 9
This example provides a concrete which is C50 concrete for a wall stud consisting of 401kg of cement (f)ce=48MPa，ρ=3.2g/cm3) 121kg of mineral powder (the activity index is more than or equal to 95% in 28 days, and rho =2.75 g/cm)3) 25kg of fly ash (activity index of more than or equal to 70% in 28 days, rho =2.1 g/cm)3) 85kg of fine sand (. mu.) was addedf=1.6，Ab=1.0，Wc=8.0，Ag=0.22，ρ=3g/cm3) 969kg of coarse sand (. mu.)f=3.1，Ab=1.0，Wc=4.5，Ag=21.60，ρ=2.9g/cm3) 729kg of cobblestone (Gr = 10-25, Ab =0.5, W)c=0.0，ρ=2.75g/cm3) 169kg of water are stirred and mixed; the concrete is also added with the concrete admixture provided by the embodiment 7, and specifically, the addition amounts of the slump retaining admixture and the water reducing admixture are respectively 0.4 percent and 2.2 percent of the concrete; the combined modulus of the above-mentioned sand composition was 2.98.
Example 10
This example provides a concrete which is a high volume C30 concrete consisting of 208kg of cement (f)ce=48MPa，ρ=3.2g/cm3) 104kg of mineral powder (the activity index is more than or equal to 95% in 28 days, and rho =2.75 g/cm)3) 62kg of fly ash (the activity index is more than or equal to 70% in 28 days, and rho =2.1 g/cm)3) 441kg of fine sand (. mu.g)f=1.6，Ab=1.0，Wc=8.0，Ag=0.22，ρ=3g/cm3) 726kg of coarse sand (mu)f=3.1，Ab=1.0，Wc=4.5，Ag=21.60，ρ=2.9g/cm3) 748kg of cobblestone (Gr = 10-25, Ab =0.5, W)c=0.0，ρ=2.75g/cm3) 175kg of water are stirred and mixed; the concrete was further added with the concrete admixture provided in example 7, specifically, the slump retaining admixture and the water-reducing admixture were added in amounts of 0.7% and1.5 percent; the above-mentioned sand composition of the blend proportions had a combined modulus of 2.53.
Example 11
This example provides a concrete which is a fine stone C30 concrete consisting of 248kg of cement (f)ce=48MPa，ρ=3.2g/cm3) 94kg of mineral powder (the activity index is more than or equal to 95% in 28 days, and rho =2.75 g/cm)3) 72kg of fly ash (the activity index is more than or equal to 70% in 28 days, and rho =2.1 g/cm)3) 428kg of fine sand (. mu.g)f=1.6，Ab=1.0，Wc=8.0，Ag=0.22，ρ=3g/cm3) 699kg of grit (. mu.) for the treatment of gastric ulcerf=3.1，Ab=1.0，Wc=4.5，Ag=21.60，ρ=2.9g/cm3) 698kg of melon seeds stone (Gr = 5-10, Ab =1.0, W)c=0.0，ρ=2.75g/cm3) 190kg of water and stirring and mixing; the concrete is also added with the concrete admixture provided by the embodiment 7, and specifically, the addition amounts of the slump retaining admixture and the water reducing admixture are respectively 0.7 percent and 1.5 percent of the concrete; the above-mentioned sand composition of the blend proportions had a combined modulus of 2.53.
Example 12
This example provides a concrete, which is C30 concrete for road surfaces, consisting of 258kg of cement (f)ce=48MPa，ρ=3.2g/cm3) 73kg of mineral powder (the activity index is more than or equal to 95% in 28 days, and rho =2.75 g/cm)3) 36kg of fly ash (the activity index is more than or equal to 70% in 28 days, and rho =2.1 g/cm)3) 386kg of fine sand (mu)f=1.6，Ab=1.0，Wc=8.0，Ag=0.22，ρ=3g/cm3) 559kg of grit (. mu.) and sandf=3.1，Ab=1.0，Wc=4.5，Ag=21.60，ρ=2.9g/cm3) 681kg of medium stones (Gr = 10-25, Ab =0.5, W)c=0.0，ρ=2.75g/cm3) 243kg of large stones (Gr = 10-31.5, Ab =0.6, W)c=0.0，ρ=2.77g/cm3) 195kg of water are stirred and mixed; the concrete is also added with the concrete admixture provided by the embodiment 7, and specifically, the addition amounts of the slump retaining admixture and the water reducing admixture are respectively 1.0 percent and 0.6 percent of the concrete; the combined modulus of the above-mentioned sand composition was 2.98.
Comparative example 1
This comparative example provides a concrete which differs from example 8 only in that: the concrete is only added with the water reducing admixture, and the addition amount of the water reducing admixture is 1.9 percent of the concrete.
Comparative example 2
This comparative example provides a concrete which differs from example 8 only in that: the concrete is only added with the slump-retaining additive, and the addition amount of the slump-retaining additive is 2.4 percent of the concrete.
The slump, the 28d strength and the 60d strength of the concrete provided in example 8 and comparative examples 1-2 after leaving the machine (after 3min, 0.5h and 2 h), respectively, were measured, and the results are shown in table 1 below.
TABLE 1
Figure DEST_PATH_IMAGE002A
As can be seen from Table 1, the concrete which is subjected to targeted adjustment by the concrete admixture provided by the embodiment of the invention has similar performance of machine leaving and construction over time, and has better slump retaining performance and retarding performance.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. The concrete admixture is characterized by comprising a slump retaining admixture and a water reducing admixture; the slump loss resistant additive comprises the following components in percentage by weight: 0.1-5% of sodium gluconate, 1-5% of a water reducing agent, 20-30% of a slump retaining agent, 0.01-0.08% of an air entraining agent, 0.03-0.1% of a defoaming agent and the balance of water, wherein the sum of the weight percentages of the components is 100%; the water-reducing admixture comprises the following components in percentage by weight: 0.1-5% of sodium gluconate, 17-27% of a water reducing agent, 1-5% of a slump retaining agent, 0.01-0.08% of an air entraining agent, 0.03-0.1% of a defoaming agent and the balance of water, wherein the sum of the weight percentages of the components is 100%.
2. The concrete admixture according to claim 1, wherein the slump retaining admixture comprises the following components in percentage by weight: 1-2% of sodium gluconate, 2-3% of a water reducing agent, 23-26% of a slump retaining agent, 0.02-0.04% of an air entraining agent, 0.04-0.06% of a defoaming agent and the balance of water, wherein the sum of the weight percentages of the components is 100%; the water-reducing admixture comprises the following components in percentage by weight: 1-2% of sodium gluconate, 20-23% of a water reducing agent, 2-3% of a slump retaining agent, 0.02-0.04% of an air entraining agent, 0.04-0.06% of a defoaming agent and the balance of water, wherein the sum of the weight percentages of the components is 100%.
3. The concrete admixture according to claim 1 or 2, wherein the water-reducing agent is a polycarboxylic acid type water-reducing agent; the slump retaining agent is a polycarboxylic acid type slump retaining agent.
4. A concrete admixture according to claim 1 or 2 wherein the air entraining agent is an anionic surface active air entraining agent.
5. A concrete admixture according to claim 1 or 2, wherein said defoaming agent is an acetylene glycol type defoaming agent.
6. A method for preparing the concrete admixture according to any one of claims 1 to 5, comprising the steps of:
weighing sodium gluconate, a water reducing agent, a slump retaining agent, an air entraining agent, a defoaming agent and water according to the weight percentage of each component in the slump retaining additive, and mixing the components to obtain the slump retaining additive;
weighing sodium gluconate, a water reducing agent, a slump retaining agent, an air entraining agent, a defoaming agent and water according to the weight percentage of each component in the water reducing admixture, and mixing the components to obtain the water reducing admixture;
and dynamically matching the slump-retaining admixture with the water-reducing admixture to obtain the concrete admixture.
7. A concrete admixture produced by the production method according to claim 6.
8. Use of the concrete admixture according to any one of claims 1 to 5 for quality control of concrete.
9. A method for controlling the direction of a concrete target by using the concrete admixture according to any one of claims 1 to 5, comprising the steps of:
determining the blending proportion of the slump-retaining admixture and the water-reducing admixture according to the type of the concrete to be regulated;
and dynamically matching the slump-retaining admixture and the water-reducing admixture with the concrete to be regulated according to the blending proportion of the slump-retaining admixture and the water-reducing admixture to obtain the concrete with the quality controlled by targeted regulation.
10. A concrete comprising a concrete admixture according to any one of claims 1 to 5 and claim 7.
CN202010488571.XA 2020-06-02 2020-06-02 Concrete admixture, preparation method thereof and concrete target direction regulating and controlling method Pending CN111533479A (en)

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CN111978005A (en) * 2020-08-24 2020-11-24 陕西瑞星建材科技有限公司 Composite water reducing agent and preparation method and application thereof
CN113666769A (en) * 2021-09-08 2021-11-19 内蒙古汇方新型建材有限公司 High-alumina fly ash light autoclaved aerated concrete plate and preparation method thereof

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WO2012075620A1 (en) * 2010-12-06 2012-06-14 Construction Research & Technology Gmbh Method for preparing admixture blends for construction material on site and a micro-plant for implementing the method
CN109534714A (en) * 2018-12-28 2019-03-29 巩义市豫源建筑工程材料有限责任公司 High-performance water reducing agent
CN109734353A (en) * 2019-01-28 2019-05-10 中水电第十一工程局（郑州）有限公司 A kind of high-slump-retentionpolycarboxylate polycarboxylate water reducer

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WO2012075620A1 (en) * 2010-12-06 2012-06-14 Construction Research & Technology Gmbh Method for preparing admixture blends for construction material on site and a micro-plant for implementing the method
CN109534714A (en) * 2018-12-28 2019-03-29 巩义市豫源建筑工程材料有限责任公司 High-performance water reducing agent
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CN111978005A (en) * 2020-08-24 2020-11-24 陕西瑞星建材科技有限公司 Composite water reducing agent and preparation method and application thereof
CN113666769A (en) * 2021-09-08 2021-11-19 内蒙古汇方新型建材有限公司 High-alumina fly ash light autoclaved aerated concrete plate and preparation method thereof
CN113666769B (en) * 2021-09-08 2022-06-07 内蒙古汇方新型建材有限公司 High-alumina fly ash light autoclaved aerated concrete plate and preparation method thereof

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