机制砂及石粉含量对混凝土抗冻性能的影响

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.

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

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 stu-(died.) 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.