Controlled/slow release polycarboxylate water reducing agent for inhabiting aggregate mud content influence and preparation method thereof

Abstract

The invention relates to a controlled / slow release polycarboxylate water reducing agent for inhabiting the aggregate mud content influence, which is characterized in that the controlled / slow release polycarboxylate water reducing agent comprises the following ingredients by weight parts: 75 to 95 parts of polycarboxylate water reducing agents, 2 to 5 parts of retarders and 5 to 25 parts of slow release agents. Because natural zeolite powder has the characteristics of microporous structure, large specific surface area and strong surface absorption capability, the natural zeolite powder can be used as the slow release agents. The invention utilizes the natural zeolite powder as the slow release agents, and the surface of the natural zeolite powder can absorb a large number of polycarboxylate water reducing agents and a small number of retarders after the natural zeolite powder is mixed with the polycarboxylate water reducing agents and the retarder. Clay can preferentially absorb the natural zeolite powder with strong surface absorption capability when the natural zeolite powder is doped into concrete to be stirred with gelled materials, aggregates and water, and the excessive absorption of the polycarboxylate water reducing agent by the clay is avoided, so the absorption of the polycarboxylate water reducing agents on cement grains and the dispersing effect taking are ensured.

Description

technical field [0001] The invention relates to a controlled and slow-release polycarboxylate water reducer, in particular to a controlled and slow release polycarboxylate water reducer that suppresses the influence of aggregate mud content and a preparation method thereof. Background technique [0002] High-performance concrete is generally composed of cementitious materials, aggregates, superplasticizers and water, among which superplasticizers and aggregates are essential raw materials. Polycarboxylate-based water reducer is a new generation of high-efficiency water-reducer developed after naphthalene-based, melamine-based, and sulfamate-based high-efficiency water-reducers. High performance, good slump retention, good compatibility with cement and other characteristics, the application of polycarboxylate superplasticizer in high performance concrete has become the current development trend. [0003] Compared with naphthalene-based, melamine-based, and sulfamate-based su...

AI Technical Summary

Problems solved by technology

The mud content of fine aggregate and coarse aggregate used in production is generally 5-10% and 1-3% respectively, which is much higher than the national standard for fine aggregate and coarse aggregate mud content of less than 3%. And the range of less than 1% (C30 ~ C55 ready-mixed concrete), resulting in greatly reduced water reducing rate and slump retention of polycarboxylate water reducer, mainly because the interlayer structure of clay can absorb a large amount of polycarboxylate Superplasticizer molecules, while the adsorption of naphthalene, melamine, and sulfamate superplasticizer molecules is less, and the polycarboxylate superplasticizer is absorbed by clay in a large amount, and the part used to disperse cement particles is reduced. Sexual deterioration

[0004] The influence of aggregate mud content on the water reducing rate and slump retention of polycarboxylate superplasticizers is also one of the important reasons why polycarboxylate superplasticizers are difficult to promote and apply in the ready-mixed concrete industry

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