Semi-encrypted silica fume for gymnasiums concrete

Semi-encrypted silica fume for gymnasiums concrete:This semi-encrypted Microsilica is typically added to concrete used in the construction of stadiums to increase the frost and fire resistance of the concrete.Silica fume can improve the microstructure of concrete and cement paste to a certain extent, but the particle diameter of Silica Fume is relatively small, and its surface area is large, the micro silicon powder is added to the concrete and cement paste, and then add silica fume again, the water demand will increase with the increase of silica fume, and at the same time, the self-shrinkage will also increase. Therefore, after many tests concluded that the mixing range of silica fume needs to be controlled between 5% and 10%. If the moisture is insufficient, it can be adjusted by using high efficient water reducing agent. In addition, there is a problem of sameness between additional additives, silica fume and cement, so its application conditions must be fully considered when using silica fume. As silica fume is added to the concrete, the concrete properties and hardened cement paste will be favourable, but in the meantime it is necessary to add some other volcanic ash materials to avoid the adverse effects of silica fume on it, in addition to the volcanic ash, but also the use of fly ash and its mixing.