Special additive for underwater undispersed shrinking-free grouting material

Abstract

The invention relates to a special additive for an underwater undispersed shrinking-free grouting material, which consists of flocculant, early strength agent, water reducing agent, air-entraining agent and active admixture and is prepared from the following raw materials by weight: 4 to 9 percent of the flocculant, 15 to 32 percent of the water reducing agent, 9 to 25 percent of expansion agent, 8 to 30 percent of the early strength agent, 0.04 to 0.7 percent of the air-entraining agent, and 18 to 35 percent of the active admixture. The special additive for the underwater undispersed shrinking-free grouting material can maintain the large fluidity and the micro expansibility of the grouting material, ensure the underwater direct grouting construction without dispersion and segregation, simplify an underwater sealing repairing process, save labor force and avoid environmental pollution to the nearby water area, and has good development prospect.

Description

technical field [0001] The invention relates to a special admixture for underwater non-dispersing and non-shrinking grouting materials and a preparation method thereof, belonging to the technical field of building materials. Background technique [0002] Due to the adoption of some new construction techniques, many bridges and water conservancy projects currently under construction in our country need to carry out underwater grouting sealing and water-stop construction under the conditions of high water head, long flow, and small pipe diameter. Concrete cracks need to be repaired or reinforced. Traditional construction methods such as cofferdam drainage method and conduit method cannot be used or the cost is high. A new type of material suitable for direct underwater grouting is needed. [0003] The underwater non-dispersible concrete is to add the underwater non-dispersible agent mainly flocculant to the fresh concrete, so that it can form ionic or covalent bonds with the s...

AI Technical Summary

Problems solved by technology

However, when ordinary cement-based grouting materials are directly applied to underwater grouting, the grout will be lost due to water erosion, which will seriously affect the grouting quality.

However, it is difficult for general underwater non-dispersible agents to achieve the large fluidity and micro-swelling effect required by grouting materials.

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