Experimental study on flexural behaviors of RC beams after freeze-thaw cycles
In order to investigate the flexural behaviors of RC beams after freeze-thaw cycles,cubes compressive strength test of concrete after 0,50,100 and 125 freeze-thaw cycles were made,and static flexural experiments of 48 RC beams after 0,50,100 and 125 freeze-thaw cycles were made.Relationships of mass loss rate,relative dynamic elastic modulus,relative compressive strength and number of freeze-thaw cycles were analyzed.The influences of freeze-thaw cycles on the flexural behaviors of RC beams with different concrete grades were studied.The results show that concrete prisms' mass,relative dynamic elastic modulus and compressive strength decrease with the increasing of number of freeze-thaw cycles,and high-strength grade concrete could slow down the damage caused by freeze-thaw cycles.Some appropriate designed RC beams exhibit over-reinforced failure mode after freeze-thaw cycles.Boundary reinforcement ratio of RC beams after freeze-thaw cycles was derived,and verified by experiment.Current code for design of concrete structure about calculation of cracking load and ultimate load are still suitable for RC beams after freeze-thaw cycles.
国家科技期刊平台
NSTL
万方数据
维普
