what are the benefits of adding microsilica to concrete-pg电玩城

we all know that concrete should be diluted with water during construction. at this time, concrete is not conducive to use. it is not conducive to stereotyping and easy to form blisters. in concrete, internal bleeding is blocked by aggregate particles and accumulates under the aggregate to form a porous interface. more ca(oh)2 was formed in the filtering area of aggregate interface than in other areas. ca(oh)2 crystals grew larger and had strong orientation parallel to the surface of the aggregate.

large ca(oh)2 crystals parallel to the surface of the aggregate are easier to crack than hydrated calcium silicate gel (c-s-h). the interfacial filtration zone between cement slurry and aggregate is a weak area of strength inside concrete due to porosity and many unidirectional large ca(oh)2 crystals. when a certain amount of silica powder is added to hpc, its strength is obviously improved compared with ordinary concrete (no silica powder). some scholars have calculated that if the cement is replaced by 15% silica powder, the ratio between the number of cement particles and the number of silica powder particles is 1:2000000, that is, 2 million silica powder on a cement particle. therefore, silica powder has a great influence on the strength of hpc. in hpc cement particle diameter less than 100 times that of micro microsilica, filling in between the porosity of the cement paste, filling the gap between cement particles and its effect between cement particles fill the gap in aggregate is filled with coarse aggregate and fine aggregate gap between, from microscopic scales increase the compactness of hpc, improve the strength of hpc, this is the "filling effect" micro microsilica. in hpc, the amount of pores in cement slurry is significantly reduced and homogeneity is improved, while the total void ratio is basically unchanged.

the shotcrete with microsilica is mainly used for solid rock engineering, lining of mining tunnel, vertical column of marine engineering project, etc., which has good adhesion. it can not only be constructed in dry and wet environment to reduce rebound, but also has a fineness suitable for various nozzles, making the construction of shotcrete more economical, more time saving and more effective.

♦ can reduce the shotcrete springback losses amounted to 50%

♦ can improve the efficiency of construction, a spray layer thickness can be up to 12 inches

♦ can have higher bond strength

♦ can have high resistivity and low permeability

♦ can have higher compressive strength and flexural strength

high grade silica powder concrete is very thick and thick. when mixing, it shall adopt a forced type mixer. the mixing time shall be extended by 30-60s compared with ordinary concrete.

wet curing time, making silica powder into slurry, mixing expansion agent, water retaining agent, etc. after these measures were applied in the project, they all produced good results.