Underwater anti-dispersion mortar for large-area cavity grouting and preparation method thereof

Abstract

The invention discloses an underwater anti-dispersion mortar used for large-area cavity grouting, which is made of cementitious material, aggregate, water, water reducing agent and thickener, among its component raw materials, glue The dosage of cementitious material is 700kg / m3~1200kg / m3, the dosage of aggregate is 700kg / m3~1500kg / m3, the dosage of water reducer is 0.5%~6.0% of the total mass of cementitious material, and the dosage of thickener is 0.1‰~2.0‰ of the total mass of cementitious materials, and the water-cement ratio is 0.25~0.50. The mortar of the present invention has high fluidity and underwater dispersion resistance, and can satisfy continuous and stable pouring under the condition of small grouting pipe diameter and small construction site; by reducing the water-binder ratio, the way of improving the compressive strength of the mortar , so that the mortar has a higher strength after entering the water; moreover, the mortar prepared by the present invention also has the advantages of simple construction process, convenient and fast construction and easy acquisition of raw materials.

Description

technical field [0001] The invention relates to a grouting material and a preparation method thereof, in particular to an underwater anti-dispersion mortar used for plugging grouting of large-area underwater karst passages and underwater building cavities and a preparation method thereof. Background technique [0002] In water conservancy and hydropower projects, it is often necessary to block some hidden underground karst passages or cavities or cavities of underwater buildings. This type of project usually has the following characteristics: karst passages or cavities, large internal area of ​​holes, internal structure Complex, with water passing through the inside and the flow rate is not small, and the inside is under high pressure, etc. In this type of project, there are mainly the following difficulties to be solved: ①The internal structure of karst channels or cavities is complex, and the cavity can only be filled by the self-flow and diffusion of mortar; The cement m...

AI Technical Summary

Problems solved by technology

However, in the case of underwater karst channels, cavities or caves with complex internal structures, large areas, high water flow rates, or difficult construction conditions, these construction methods may cause insufficient fluidity of poured materials, making it difficult to effectively deploy The cavity is full; the specific gravity of the poured material is too light and is washed away by water; the poured material has poor dispersion resistance in water and is diluted by water, etc., and it is difficult to receive the desired effect

[0004] Therefore, the existing plugging grouting materials for this large-scale underwater karst passage and cavity are still not ideal.

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