The role of silica fume in grouting material
There are many good effects of silica fume on the properties of grout. The beneficial effects of amorphous and extremely fine silica fume on high performance grout are manifested in physical and chemical aspects: it plays the role of ultra-fine filling material; It plays the role of crystal nucleus in the early hydration process and has high volcanic ash activity.
Influence of the hydration silica dust of the cementitious material system on the hydration heat release of the cementitious material system.
Improve the strength of grouting material
When wollastonite is used in combination with highly effective water-reducing agent, the wollastonite reacts with hydration product Ca (OH) 2 to form calcium silicate hydrate gel, fill the gap between cement particles, improve the interface structure and bonding force, form a dense structure, and thus significantly improve the grouting strength. General silica fume content of 5%~10%, can be matched with the compressive strength of 100MPa ultra high strength grouting material.
Increase density
The silica fume particles are small enough to fill the gaps between the cement particles. Dense particle accumulation can reduce bleeding, reduce high-strength non-shrinkage grouting hole and average pore size. When the content of silica fume is 5%~10%, good mixing effect can be obtained. Water reducer should be used to ensure silica fume and cement dispersion.
