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concrete admixture

A technology of concrete admixture and water-reducing agent, applied in the field of concrete admixture, can solve the problems such as failure to effectively reduce sand with high mud content, single performance of the admixture, inability to meet various needs, etc. The effect of improving workability and ensuring liquidity

Active Publication Date: 2016-03-02
RIZHAO FEM NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the existing concrete admixtures can reduce mixing water, increase workability, control setting time, early strength, reinforcement, durability, dyeing, air-entrainment, etc., but the admixtures generally have single performance and cannot meet various needs. , and there is no admixture that can effectively reduce the impact of high mud content sand on the performance of concrete

Method used

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Examples

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Effect test

Embodiment 1

[0027] The formula of the concrete admixture of the present invention is: 45 parts of polycarboxylate water reducer, 16 parts of cellulose grafted chitosan, 16 parts of pretreated flue deposits, 6 parts of silane coupling agent, and 3 parts of polyvinylpyrrolidone , 2 parts of silicon carbide.

[0028] The preparation method is:

[0029] 1. Take the flue sediment, grind the sediment into a fine powder, put it into water 4 times the mass of the sediment, ultrasonicate for 30 minutes, then filter and dry to obtain the pretreated flue sediment for future use.

[0030] 2. Preparation of cellulose-grafted chitosan: add cellulose to distilled water, stir to disperse, pass nitrogen gas for 30 minutes to remove oxygen, then add potassium persulfate solution under nitrogen protection, pretreat at 55°C for 2 hours, then add A 1wt% acetic acid solution of chitosan dissolved with a crosslinking agent was reacted at 50°C for 4 hours. After the reaction, water-soluble impurities were removed...

Embodiment 2

[0033] The formula of the concrete admixture of the present invention is: 40 parts of polycarboxylate water reducer, 20 parts of cellulose grafted chitosan, 15 parts of pretreated flue deposits, 10 parts of silane coupling agent, and 1 part of polyvinylpyrrolidone , 5 parts of silicon carbide. The preparation method is the same as in Example 1.

Embodiment 3

[0035] The formula of the concrete admixture of the present invention is: 50 parts of polycarboxylate water reducer, 15 parts of cellulose grafted chitosan, 20 parts of pretreated flue deposits, 5 parts of silane coupling agent, and 5 parts of polyvinylpyrrolidone , 1 part of silicon carbide. The preparation method is the same as in Example 1.

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Abstract

The invention discloses a concrete admixture, which comprises the following raw materials in parts by weight: 40-50 parts of polycarboxylate water reducer, 15-20 parts of cellulose grafted chitosan, 15-20 parts of flue deposits, 5-10 parts of silane coupling agent, 1-5 parts of polyvinylpyrrolidone, and 1-5 parts of silicon carbide. The admixture of the present invention is easy to prepare, and the scientific collocation of each component can reduce the slump loss of concrete, improve the workability of concrete, and ensure the fluidity of concrete. In addition, the presence of components in the admixture can also improve the adsorption state of soil , reduce the impact of mud content on concrete and water reducer, and the performance of the concrete obtained when the mud content is as high as 10% can still meet the requirements.

Description

technical field [0001] The invention relates to a concrete admixture, in particular to a concrete admixture suitable for sand with high mud content and reducing the influence of mud content on concrete performance. Background technique [0002] Concrete is the most widely used building material in modern times. It has the advantages of abundant raw materials, low price, simple process, high strength and good durability. Ready-mixed concrete is a kind of concrete, which refers to cement, aggregates, water, admixtures, mineral admixtures and other components mixed in according to a certain proportion in a mixing station after being measured and mixed, and sold. Concrete mixture transported to the place of use within the specified time by transport truck. Because of the high environmental impact of on-site construction, ready-mixed concrete has received increasing attention. However, after mixing concrete materials, chemical reactions will occur over time, which will have adv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/42
Inventor 肖维录鲁守伟
Owner RIZHAO FEM NEW MATERIAL TECH