机制砂及石粉含量对混凝土抗冻性能的影响

Effects of Manufactured Fine Aggregate and Aggregate Micro Fines on Frost-Resistant Performance of Concrete

研究了不同岩性机制砂、石粉含量对混凝土抗冻性能的影响,研究了石粉含量对混凝土工作性能和抗压强度的影响.结果表明:适量的石粉可以改善混凝土的抗冻性能,提高混凝土的工作性和抗压强度;母岩类型对机制砂混凝土的抗冻性没有明显的影响;引入引气剂、增稠剂或适当提高机制砂混凝土中胶凝材料与石粉的比例,可提高机制砂混凝土的抗冻性能.

The effects of different lithologic manufactured fine aggregate（MFA） and contents of aggregate micro fines（AMF） on frost-resistant performance of concrete were researched, and the effects of contents of AMF on working performance, compressive strength of concrete were studied. The results show that frost-resistant performance, working performance, compressive strength of concrete may be improved by mixing proper AMF; the effects of type of mother rock on MFA concrete is not remarkable; the frost-resistant performance of MFA concrete may be improved by mixing air-entraining agent and thickening agent, or increasing the proportion of cement and AMF.