what are the characteristics of microsilica for high strength concrete-pg电玩城

although the early development of relative strength of silcrete is slower than that of pure cement concrete under the same water-binder ratio, the absolute strength of silcrete is higher than that of pure cement concrete because the strength is greatly improved by adding microsilica. on the other hand, experience shows that the early strength development of hpc is faster than that of nsc. although the setting time of hpc may be slightly delayed, the hydration effect of hpc after condensation will be greatly accelerated due to the efficient water reducing agent and silicon powder. the result is usually a very rapid development of strength after condensation.

adding microsilica to high strength concrete allows the designer and builder of the project to make more creative choices. for example, the use of high strength concrete with microsilicacan avoid excessive pillars in the design of super high-rise buildings to increase the building use space, and the addition of microsilicacan preform prestressed beams with larger span. 

♦ can raise the compressive strength of concrete to 140 mpa 

♦ allows the elastic modulus of concrete is as high as 40000 mpa 

♦ 28 days can make the flexural strength of runway 14 mpa 

♦ higher early strength can be applied to assault project and fabrication in the concrete mixed with micro silicon powder, must be mixed with high efficiency water reducing agent, at the same time to guarantee the necessary liquidity and silicon powder concrete on the enhanced effect of concrete. however, special attention should be paid to the adaptability of high-efficiency water reducing agent and other materials in concrete. therefore, it is necessary to determine the amount of microsilica, admixture and other cementitious materials and the relative optimum proportion of concrete by trial mixing concrete experiment, combining the engineering characteristics and the properties of the raw materials to be used. in addition, when the high efficiency water reducing agent is added into the micromicrosilica concrete with low water-cement ratio, the concrete slump loss will be accelerated when the amount of micromicrosilica is large or the ambient temperature is higher. therefore, it is necessary to control the amount of microsilica or retarder in the construction of microsilica concrete with long transport distance or pumping concrete.