Water reducing agent for super slump retaining concrete

Abstract

The invention relates to a water reducing agent for super slump retaining concrete, which is prepared from the following raw materials: 20-35% of polycarboxylic acid water reducing agent, 6-14% of polycarboxylic acid slump retaining agent C series, 1-4% of a retarder, 0.05-1% of a water retaining agent, 0.05-0.25% of an air entraining agent, 0-0.1% of a defoaming agent and the balance of water, wherein the sum of the mass percentages of the components is 100%. The polycarboxylic acid slump retaining agent C series is one or a combination of more than one of a polycarboxylic acid slump retaining agent C1, a polycarboxylic acid slump retaining agent C2 and a polycarboxylic acid slump retaining agent C3; the retarder is one or a combination of more than one of sodium gluconate, white granulated sugar, sodium tripolyphosphate, sodium hexametaphosphate, citric acid, oxalic acid, hydroxyethylidene diphosphonic acid, sodium citrate, tannic acid and zinc sulfate. The invention further providesa preparation method of the polycarboxylic acid slump retaining agents C1, C2 and C3. The water reducing agent can achieve long-term slump protection of the concrete, and solves the problems that theconcrete needs long-term slump protection in the concrete, but the concrete returns for a short time to seperate water, the setting time is not up to the standard, and the like.

Description

technical field [0001] The invention relates to a water reducer for concrete, in particular to a water reducer for ultra-slump concrete. Background technique [0002] As a green and environmentally friendly concrete chemical admixture, polycarboxylate water reducer is gradually widely used in the industry because of its excellent water reducing performance. Traditional polycarboxylate superplasticizers can usually achieve good dispersion or water reducing performance. Short-distance transportation has also been greatly improved with the comprehensive application of slump-retaining agents. However, as environmental protection issues have become increasingly prominent, major commercial concrete mixing plants in urban areas and even suburbs have been closed down in large numbers, and concrete for urban construction needs suburban or The supply of more distant mixing plants has brought a serious test to the transportation requirements of commercial concrete. The transportation ...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a water reducer for ultra-slump-retaining concrete, which can realize long-term slump-preservation of concrete, so as to solve the problem of long-term slump-preservation but short-term concrete return to large bleeding, segregation, and setting time. Issues such as non-compliance

Images