Abstract
Which is composed of crystalline silica, a small amount of mica and molybdenum ore salts, and is non-radioactive. As a fine aggregate of concrete, the water demand of fresh concrete will be increased. By increasing the dosage of water-reducing agent, the construction performance of concrete mixture can reach the actual pumping concrete slump-flow (500±30) mm under the condition of unchanged water demand, and the same construction performance as that of mechanical sand concrete can be obtained. With the gradual increase of the replacement ratio, the compressive strength gradually decreases. When the replacement ratio does not exceed 40%, the 90d compressive strength decreases less than 3.1% compared with the mechanical sand concrete, which has less impact on the strength and can fully meet the requirements of the mechanical properties of C30 concrete.
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