Cement-based no-shrinkage grouting material

Abstract

The invention discloses a cement-based no-shrinkage grouting material which is prepared by carrying out dry mixing on the following raw materials in parts by weight: 350-400 parts of cement, 550-600 parts of sand, 4-6 parts of water reducing agent, 20-40 parts of rigid expanding agent, 0.1-0.25 part of plastic expanding agent, 0.3-0.8 part of defoaming agent, 0.8-1.6 parts of retarder and 0-8 parts of property regulator. The grouting material disclosed by the invention has the advantages of low consumption of expanded components, high plastic expansion ratio, high rigid expansion ratio, short stabilization time, low dependence on wet curing, excellent flowability and excellent strength property, and can be used for large-scale equipment installation, bolt anchorage and structure reinforcement.

Description

technical field [0001] The invention belongs to the technical field of cement-based materials, and in particular relates to a cement-based non-shrinkage grouting material. Background technique [0002] Cement-based non-shrinkage grouting material has the characteristics of good self-flow, rapid hardening, high strength, micro-expansion, non-toxic and harmless, no aging, no pollution, anti-rust, convenient construction, etc. It is widely used for anchoring anchor bolts, fixing nuclear power equipment, Secondary grouting of equipment foundation, reinforcement and transformation of embedded reinforced concrete structures, crack treatment of old concrete structures, etc. In order to obtain ideal reinforcement, anchorage and crack treatment effects, in addition to good fluidity, fluidity retention performance and strength performance requirements, cement-based grouting materials need to produce a certain plastic expansion before setting and hardening to compensate for plastic shr...

AI Technical Summary

Problems solved by technology

Chinese patent CN102491669C discloses a kind of p-nitrobenzene diazonium fluoroborate, iminodiacetonitrile, N, N-dicyclohexyl-2-phenylbuthiazole sulfenamide compound as gas-generating components, hard The preparation method of a special plastic expansion agent with fatty acid ester as the coating component and potassium hydroxide or lithium hydroxide as the catalytic component can realize the high-efficiency plastic expansion of 3 hours and meet the requirements of the difference between the vertical expansion rate of 3 hours and 24 hours. At the same time, the release of hydrogen gas is also avoided, but this method requires a complicated preparation process, and the difference in the vertical expansion rate between 24h and 3h is actually produced by the plastic expansion of the gas, resulting in a lower compressive strength of the grout

[0005] In addition, the ettringite expansion source cannot provide effective plastic expansion, and the plastic expansion or insufficient rigid expansion of the grouting material cannot achieve the expected use effect. Therefore, the cement-based non-shrinking grouting material with excellent performance needs to have both high-efficiency plastic expansion and rigidity. expand

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