高温蒸汽养护时间对超高性能混凝土力学性能的影响

Influence of High Temperature Steam Curing Time on Mechanical Properties of Ultra-high Performance Concrete

文章通过抗压强度、抗折强度、弹性模量试验,研究在90℃恒温蒸汽养护条件下不同恒温时间对超高性能混凝土(UHPC)力学性能的影响。结果表明:采用高温蒸汽养护后的各组UHPC抗压强度、抗折强度、弹性模量均高于7 d龄期标准养护试件组;UHPC抗压强度、抗折强度随恒温时间的增加而提高,弹性模量受恒温时间的影响较小;抗压强度在恒温0~24 h阶段强度发展率增长最快,抗折强度在高温恒温24~48 h阶段强度发展率增长最快。

The influence of different constant temperature time on the mechanical properties of ultra-high performance concrete( UHPC) under the condition of constant temperature steam curing at 90 ℃ were studied through compressive strength, flexural strength and elastic modulus tests. The results show that the compressive strength, flexural strength and elastic modulus of UHPC in each group after high temperature steam curing are higher than those of standard curing specimen group at 7 d age. The compressive strength and flexural strength of UHPC increase with the increase of constant temperature time, and the elastic modulus is less affected by constant temperature time. The compressive strength of UHPC increases the fastest in the stage of constant temperature 0-24 h, and the flexural strength increases the fastest in the stage of constant high temperature 24-48 h.