Low-permeability cement-based grouting material suitable for chloride ions

Abstract

The invention discloses a low-permeability cement-based grouting material suitable for chloride ions. The low-permeability cement-based grouting material is prepared from the following raw materials by percentages: 39.7-40.7% of 42.5R ordinary portland cement, 39.7-40.7% of river sand, 3.2-3.3% of fly ashes, 2% of silica fume, 0.28% of a water reducing agent, 0.04% of a retarder, 3.18-3.28% of an expanding agent and 9.7-11.9% of water. According to the cement-based grouting material, admixtures such as the river sand, the fly ashes and the silica fume are optimized and combined on the basis of the ordinary portland cement, and supplemented by additives such as the water reducing agent, the retarder and the expanding agent, so that the cement-based grouting material has the advantages of high early strength, high long-term strength, good workability, micro-expansion and no bleeding through a reasonable water-cement ratio, and also has the characteristics of low total chloride ion content, a low electric flux value and high chloride penetration resistance.

Description

technical field [0001] The invention belongs to the field of cement-based grouting materials, and in particular relates to a cement-based grouting material with low chloride ion permeability. Background technique [0002] Cement-based grouting material is a dry mixture mixed with cement, admixtures (water reducer, expansion agent, retarder, etc.), aggregates and mineral admixtures. After mixing with water, it has high strength and workability. Good, micro-expansion, non-bleeding, etc., and this type of grouting material is non-toxic, harmless, and low in price. It is mostly used in secondary grouting for mechanical equipment installation, anchoring of anchor bolts, reconstruction and reinforcement of concrete structures, and prefabricated buildings. The grout connection and other fields. [0003] With the rapid development of the coastal economy, super high-rise buildings and large-scale equipment emerge in endlessly, especially the prevalence of prefabricated buildings, bu...

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Problems solved by technology

[0003] With the rapid development of the coastal economy, super high-rise buildings and large-scale equipment emerge in endlessly, especially the prevalence of prefabricated buildings, but these buildings or equipment have been damaged by the penetration of chloride ions for a long time during use, shortening the service life of buildings or equipment, However, the cement-based grouting material in the prior art has low resistance to chloride ion penetration, so it cannot meet the requirements of coastal engineering for basic materials

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