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对比了几种不同石粉含量的机制砂对混凝土的收缩及强度的影响。结果表明:机制砂对混凝土的干缩率具有正负效应,当石粉含量较少时负效应占优势,当石粉超过一定量时正效应占优势;对于抗压强度和劈裂抗拉强度也有正负效应,随着机制砂中石粉含量的增加其强度先提高后降低。
The effects of several kinds of sand with different content of stone powder on shrinkage and strength of concrete were compared. The results show that the mechanical sand has a positive and negative effect on the shrinkage of concrete, the negative effect is dominant when the content of rock dust is low, and the positive effect is dominant when the amount of powder exceeds a certain amount. The compressive strength and splitting tensile strength are also positive Negative effect, with the increase of the content of stone powder in the sand, its strength first increased and then decreased.