Abstract：The normal and the airentrained concretes with different watercementmass ratio were designed to investigate the influence of recycled fine
aggregate on mechanical properties and freezethaw resistance of concrete with different strength grade through varying the replacement rate of recycled
fine aggregate. The results show that the compressive strength and the flexural strength of normal concrete markedly decrease with the increasing of
replacement ratio of recycled fine aggregate. The compressive strength of airentrained concrete is obviously decreased with the increasing of replacement
ratio of recycled fine aggregate, while the flexural strength is less affected. The resistance to freezing and thawing of concrete with high watercement
ratio (m（water） ∶m（cement）=0.52) is poor with or without recycled fine aggregate. The resistance to freezing and thawing of concrete can be improved
with limited extent through adding airentraining agents. The antifrost performance of concrete with low watercement ratio (m（water） ∶m（cement）
=0.35) is naturally endowed and is not degraded noticeably by adding recycled fine aggregate. Adding airentraining agents has little effect for improving
the resistance to freezing and thawing. Compared with adding airentraining agents, the performance of freezethaw resistance of recycled fine aggregate
concrete can be improved noticeably by decreasing watercement ratio.
2017, Vol. 38 
