Special coagulation-delaying high-efficiency slushing agent for dam roller compacted concrete

Abstract

The invention discloses a special coagulation-delaying high-efficiency slushing agent for dam roller compacted concrete. The slushing agent comprises, by weight, 46%-60% of naphthalene-based superplasticizer, 10%-35% of a common water reducing agent, 2.5%-15.0% of retarder, 10%-20% of an activating agent and 0.05%-0.3% of a thickening agent. The final product has the advantages of being coagulation-delaying, controllable, obvious in enhancing effect after hardening of concrete, low in mixed amount, good in water reducing effect, low in cost, capable of improving cohesiveness of the concrete and the like. The slushing agent is suitable for preparation of the dam roller compacted concrete, the mixed amount of mixed materials in the dam roller compacted concrete can be increased, and remarkable economic benefit and social benefit can be achieved.

Description

technical field [0001] The invention belongs to the field of concrete admixture in building materials. In particular, it relates to a special retarding high-efficiency water reducer for dam roller compacted concrete, which is specially used for preparing dam roller compacted concrete. Background technique [0002] It is the peak period of dam construction in my country at present, and the roller compacted concrete dam is recognized as the most promising and fastest-growing dam type at home and abroad, and its dam construction technology has been vigorously promoted and applied in China. The roller compacted concrete used in the dam structure is different from conventional ordinary concrete. There are large differences in the working behavior, mix ratio design and construction methods of the two, which lead to the difference in the technical requirements of the two concrete admixtures. . [0003] Dam RCC is mainly prepared by adding retarding superplasticizer and air-entrai...

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Problems solved by technology

[0004] Since the retarding high-efficiency superplasticizers used for dam RCC on the market are basically powder products, the existing powder products on the market often sacrifice the water-reducing effect of the product while improving the retarding effect, causing users The performance requirements of roller compacted concrete can only be met by increasing the dosage, that is, increasing the cost. At the same time, the cost of existing products is too high, and the reinforcement method for roller compacted concrete is single. When compacting concrete, it is easy to have defects such as concrete dispersion

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