what are the effects of microsilica on the properties of grouting materials-pg电玩城

due to its fine size, large surface area, high purity and high activity of volcanic ash. adding silica fume as mineral admixture into cement grouting can guarantee the workability of cement grouting. the problem of excessive early shrinkage is caused by the use of silica fume, which is usually 5% to 10% of the total weight of cementitious materials, and is usually used in combination with other mineral admixtures.

effect of microsilica on properties of grout

1. hydration of microsilica silica fume to accelerate the cementitious material system:

after substituting microsilica for equivalent cement, the hydration and exothermic heat of system 3d and 7d were greatly increased. it is necessary to control the heat release in the early stage of hydration.

2. silica fume increases the strength of reinforced grouting materials, and silica fume increases the density:

microsilica particles are small enough to fill the gap between the cement particles. granules are packed tightly, reducing bleeding and reducing capillary and average pore size. good mixing effect can be obtained when the dosage of silica fume is between 5% and 10%. water reducing agents should be used to ensure the dispersion of silica powder and cement.

3. improvement of segregation and bleeding performance of reinforced grouting by silica fume silica fume:

after pouring the reinforced grouting material, water is often separated from the reinforced grouting material, that is, water film is formed on the surface layer, also known as floating grouting, which makes the distribution of the reinforced grouting material in the upper layer uneven and affects the construction quality. when microsilica is added into the reinforced grouting material and at the same time a high-efficiency water reducing agent is used to ensure the fluidity of the cement grouting material, the cohesion and water retention of the cement grouting material can be significantly improved by the addition of microsilica.

4. improve the impermeability of reinforced grouting materials with silica fume:

although the total porosity of reinforced grouting materials mixed with silica fume is basically the same as that without doping, the large capillary pores are reduced and the superfine pores are increased, which improves the pore structure of cement and effectively prevents the invasion and corrosion of harmful ions. therefore, the durability of reinforced grouting materials, such as impermeability and chemical corrosion resistance, is significantly improved, and the corrosion resistance of steel is also improved.

micro microsilica grout material depending on the type of building and underground the corrosion type, selection of acid or alkali resistance of orthopaedic/wow dioxide content is higher, the better the performance of the acid such as common granite, basalt stone and quartzite acid better stone, high content of calcium oxide and magnesium oxide dear see good performance, such as dolomite, limestone and marble, etc.