为研究机制砂在沿海地区C50混凝土配制中的应用,本文对2组河砂和4组机制砂配合比混凝土的和易性和4d、7d、28d力学性能进行了对比试验研究。结果表明河砂混凝土的和易性总体上略好于机制砂混凝土,而通过增加胶凝材料用量及用水量,可以改善机制砂混凝土的和易性;力学性能方面,机制砂混凝土各龄期的抗压强度均高于河砂混凝土。 In order to study the application of machine-made sand in the preparation of C50 concrete in coastal areas, comparative study on workability of 2-group river sand and 4-group machine-made sand with concrete and 4d, 7d, 28d mechanical properties were carried out. The results show that the workability of river sand concrete is slightly better than that of machine-made sand concrete at the whole, and the workability of machine-made sand concrete can be improved by increasing the amount of cementitious material and water consumption. In terms of mechanical properties, Compressive strength are higher than river sand concrete.