阅读说明：本技术 一种混凝土外加剂及其制备方法和混凝土靶向调控方法 (Concrete admixture, preparation method thereof and concrete target direction regulating and controlling method ) 是由 李益群 庄合理 刘美 于 2020-06-02 设计创作，主要内容包括：本发明适用于混凝土技术领域,提供了一种混凝土外加剂、其制备方法、其应用及混凝土,该混凝土外加剂包括保坍外加剂和减水外加剂；所述保坍外加剂包括以下按照重量百分数计的组分：葡萄糖酸钠0.05%~2%、减水剂1%~5%、保坍剂20%~30%、引气剂0.01%~0.05%、消泡剂0.03%~0.08%,余量为水；所述减水外加剂包括以下按照重量百分数计的组分：葡萄糖酸钠0.05%~2%、减水剂17%~27%、保坍剂1%~5%、引气剂0.01%~0.05%、消泡剂0.03%~0.08%,余量为水。本发明提供的混凝土外加剂可以进行双掺或多掺的靶向调节,从而可以较为精准地控制混凝土的质量。(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.)

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.

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.