Novel green grouting superfine cement

Abstract

The invention discloses novel green grouting superfine cement. The superfine cement comprises the following minerals of superfine silicate cement, superfine aluminate cement, superfine mineral powder, superfine coal ash, a swelling agent, a water reducing agent, a retarding agent and a diluting agent. The temperature range of the superfine cement when in use is 5-60 DEG C; the compression strength of cement stone is more than 20 MPa within 24 hours, the compression strength within 3 days is more than 42 MPa, the compression strength within 7 days is more than 55 MPa, and the compression strength within 28 days is more than 65 MPa; the initial setting time of the cement is 23-208min, the final setting time is 45-223min, time is adjustable and controllable, and the cement is high in penetrating power and can penetrate through a narrow gap with a width of 15 mum; a cement slurry body with controllable setting time and controllable strength can be formed on the premise of a water-to-cement ratio ranging from (1 to 1) to (3 to 1); and the superfine cement can be applied to seepage prevention, leaking stoppage and reinforcement in excavation of projects such as water dams, mine roadways, tunnels and the like, and is a novel green blocking material.

Description

technical field [0001] The invention relates to the fields of reinforcing dam foundations, sealing underground tunnels, underground water flow during coal mine excavation, strengthening tunnel side walls, and treating weak foundations before excavation of various underground buildings. It is a high-performance and multi-purpose composite superstructure fine cement. technical background [0002] The stratum structure in the natural state has a certain porosity, and these tiny gaps will lead to the reduction of structural strength or the flow of groundwater. When excavating mines and underground tunnels, groundwater will enter the excavation face along the cracks in the rock strata, affecting the work process and even causing engineering disasters such as landslides. At present, the method to deal with this kind of soft structure is grouting. After mixing the material with filling and cementing ability with water, the grouting equipment is used to add the pores of the forma...

AI Technical Summary

Problems solved by technology

[0004] The particle size of ordinary cement particles is 10-80μm, it is difficult to enter some narrow gaps, and it is difficult to be effective in sealing

Moreover, under the condition of high groundwater flow velocity, the cement slurry is difficult to consolidate due to erosion and dilution.

Although the applicability of the cement slurry has been improved after adding water glass, the adjustment of the gelation time is not stable enough, the gel strength is low, and the stability of the gel is poor

However, the cost of chemical grout is too high, the formula is complicated, and most of the chemical grouting materials are toxic, which restricts its development