Heavy density silica fume for bus stop cement

heavy density silica fume for bus stop cement.This Microsilica is commonly added to cement used in the construction of bus stations to increase the strength and other properties of the cement.Although Silica Fume (microsilica fume) can effectively improve the microstructure of hardened cement paste and concrete, but due to the small particle size of silica fume, large specific surface area, so the cement paste and concrete mixed into the silica fume, with the increase in the dosage of silica fume, the water demand increases, and the self-shrinkage also increases. Therefore, the dosage of silica fume is generally limited to between 5% and 10%, and high efficiency water reducing agent is used to regulate the water demand, at the same time, there is a compatibility problem between cement, silica fume and admixtures, so attention must be paid to its application conditions when using silica fume. As the concrete mixed with silica fume may lead to self-shrinkage of concrete, and the concrete mixed with silica fume is generally a special requirement of concrete, therefore, the use of silica fume in concrete on the hardening of cement paste and concrete properties of the beneficial effects of at the same time, we must try to minimise the adverse effects brought about by the silica fume, to solve this problem, the most effective way is to mix silica fume at the same time as the mixing of other volcanic ash materials or The most effective way to solve this problem is to add silica fume while adding other volcanic ash materials or other substances, so that they complement each other to achieve better technical and economic results. At present, more research is the use of ultra-fine slag and silica fume mixing, or fly ash and silica fume mixing. Another area of research on the application conditions of silica fume is the use of silane on the surface of the silica fume pre-treatment added to the cement paste or concrete or direct silane and silica fume added to the cement paste or concrete at the same time, which can improve the workability of the fresh cement paste and concrete, thereby improving the microstructure of the hardened cement paste and concrete.