喷水对火灾后纤维混凝土性能劣化的影响

The water sprinkling effect on the deterioration of the post-fire fiber concrete's performance

模拟消防水的不同喷水强度对高温火灾后混凝土的损伤破坏影响。将基准混凝土、PVA纤维混凝土、钢纤维混凝土及PVA-钢纤维混凝土试件经过200、400、600、800℃高温火灾环境处理,恒温2 h,再模拟消防喷水灭火试验。结果表明,火灾温度和喷水强度对各类别混凝土力学性能、动弹性模量、质量损失均有较大影响,且火灾温度越高、喷水强度越大劣化影响越明显;在各类别混凝土中含有钢纤维的混凝土表现最优。

The damage caused by spraying water of different intensi-ty to the concrete after a high-temperature fire was simulated.The specimen of the benchmark concrete,PVA fiber reinforced con-crete,steel fiber reinforced concrete and PVA-steel fiber concrete were treated at 200,400,600,800℃and kept at a constant tem-perature for two hours,then were put into simulated fire sprinkler fire test.The result showed that:the fire temperature and spray in-tensity have great influence on the mechanical properties,dynamic elastic modulus and mass loss of all kinds of concrete.The higher the fire temperature is,the more obvious the influence is.The con-crete containing steel fiber is the best in all kinds of concrete.