Composite superfine cement grout slurry and preparation method thereof

Abstract

The invention provides a composite superfine cement grout slurry and a preparation method thereof. The slurry is prepared by conducting ball milling on a matrix component and an additive component to obtain an ultrafine composite grouting material and mixing the water and cement according to a ratio of 0.5-0.8. The matrix consists of ordinary silicate cement, fly ash, slag and water; and the additive component comprises a grinding agent, an activator, a composite superplasticizer, an expansive agent and a retarder. The composite superfine cement grout slurry contains the following components by weight: 10% of slag, 0.8%-1.2% of composite superplasticizer, 5%-10% of expansive agent and 0.1%-0.6 of the retarder. The composite superfine cement grouting slurry provided by the invention has high fluidity and high bonding strength, and good impermeability and volume stability, and can significantly improve groutability and reinforce performance of subtle fracture of rocks if applied.

Description

technical field [0001] The invention relates to the technical field of mine and underground engineering safety, in particular to a novel composite ultra-fine cement grouting slurry and a preparation method thereof, which is mainly used for grouting reinforcement in underground engineering fields such as mine roadways and tunnels, and is especially suitable for Grouting reinforcement of micro-cracks in surrounding rock. Background technique [0002] With the rapid development of grouting materials and grouting technology, the scope of engineering application of grouting reinforcement technology is more and more extensive, involving almost all geotechnical engineering fields such as civil engineering, water conservancy, mines, tunnels, and transportation. It has become an important factor to ensure the safety of underground engineering construction. [0003] The study found that among the cracks in the surrounding rock, micro cracks (closed cracks and micro-opened cracks) acc...

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Problems solved by technology

[0004] At present, there are not many studies on improving the injectability of grouting materials in fine cracks and improving the reinforcement characteristics of grouting materials.

Ultra-fine cement is an effective material suitable for grouting reinforcement of roadway surrounding rock micro-cracks. However, the research on the theory of ultra-fine cement grouting is not very deep. In many cases, it is still based on previous grouting practice and construction Experience makes ultra-fine cement grouting untargeted and specific, and blindness exists to a large extent. This will not only waste resources, but more importantly, bury hidden dangers in the project and cause irreparable consequences

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