摘   要：研究了机制砂对新拌混凝土坍落度、扩展度、含气量以及抗压强度的影响，并探讨了聚羧酸高效减水剂和萘系减水剂在机制砂混凝土中的适用性。结果表明，机制砂的掺入会对混凝土的和易性产生一定影响，新拌混凝土的流动性变差，最多下降了25%。机制砂能够显著改善低强度混凝土的抗压强度。对于机制砂混凝土，萘系减水剂具有更好的适用性，相同配比下能够获得更好的和易性以及更高的抗压强度。

Abstract: The effect of manufactured sand on the performance of fresh concrete is studied, which contains slump, slump flow, gas content and compressive strength. The study on applicability of polycarboxylate and naphthalene superplasticizer in the concrete which mixed with manufactured sand is also carried out. The result show that the workability of the concrete would be affected when mixed with manufactured sand, the mobility of the fresh concrete would decrease with the maximum rate of 25%; the compressive strength of low-strength concrete would improve significantly with the mixture of manufactured sand. Finally, with the same proportion, when mixed with naphthalene superplasticizer, the concrete mixed with manufactured sand would get a better workability and higher compressive strength, which indicates a better applicability of naphthalene superplasticizer .