Because the gradation of medium sand is reasonable, the content of particles below 0.3mm can reach about 15%. This part of the particles in the concrete mortar is close to the pipe wall in the pump pipe, causing friction The resistance is very small, which is beneficial to pumping. Coarse sand has high friction resistance and is not conducive to pumping. The surface area of fine sand is large, and if more cement is used at the same strength, the probability of cracking is high. </p
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