FREEZE-THAW RESISTANCE OF HIGH PERFORMANCE FIBER REINFORCED CONCRETE

摘要

The freeze-thaw resistance of PVA fiber and steel fiber reinforced concrete (FRC) was investigated. The former exhibited a strain hardening response, while the latter a strain softening behavior. Third point bending tests were used to evaluate the performance of the fiber concrete after 200 freezing and thawing cycles. With properly entrained air voids, the freeze-thaw induced damage and its associated strength loss was not significant. However, the hardening type FRC seemed more vulnerable to freeze-thaw cycling. Since strain hardening in PVA fiber reinforced concrete is mainly attributed to the adhesive bond between fibers and matrix, the corresponding decrease in toughness was indicative of bond deterioration.