points for attention in the construction of concrete with microsilica-pg电玩城

there is no significant difference between the construction method of silica powder concrete and ordinary concrete. the early strength of wollastonite concrete will bring forward the final setting time. at the same time, the addition of silica fume can improve the viscosity of concrete and greatly reduce bleeding. 

for the mix proportion design of microsilica concrete, it is mainly to determine the blending method of microsilica according to the design requirements, the optimal mixing amount of micro-microsilica, the optimal mixing amount of water-reducing agent and the adjustment of sand and stone material, while others are carried out according to the design method of ordinary concrete.

mixing method for concrete with silica powder: there are two methods for silica powder in concrete: one is internal admixture and the other is external admixture, which should be used together with water reducing agent. mixed method are often used in micro microsilica to replace cement, and classification of quantity instead of and part of the amount instead of two, equal instead of for the dosage of micro microsilica instead of cement, equal parts instead of 1 kg of micro microsilica instead of 1 ~ 3 kg of cement, as the general content is 5% ~ 30%, water cement ratio generally remain the same: and outside mixing method refers to the micro silica powder as additive in concrete, and the dosage of cement is not reduced, dosage is commonly 5% ~ 10%, and general method of the additive and the mechanical properties of concrete is much higher, but increase the dosage of gelled material in concrete. 

when concrete mixing sand, in order to obtain concrete construction requirements of liquidity, often need to add some water (more than the cement hydration water), the more water not only make the slurry is thinning, cementation force is abate, and excess water residue in concrete form blisters or waterway, evaporation with concrete hardening after leaving a large number of pores. as a result, the actual stress area of concrete is reduced, and when the concrete is stressed, stress concentration is easily generated around the pores.