摘要
基于高温传感器建立了高温自动采集系统,对火灾高温环境下混凝土内部温度进行了监测,对盾构法隧道管片有应用前景的有机纤维混凝土高温后的性能进行了试验研究.试验结果表明:火灾过程中混凝土构件从内到外存在很明显的温度梯度,掺入有机合成纤维能明显降低温度梯度引起的混凝土开裂、爆裂、剥落现象;聚丙烯纤维分解温度高于纤维素纤维和聚乙烯醇纤维,在弯拉强度、断裂能、断裂韧性及残余强度方面聚丙烯纤维混凝土均优于聚乙烯醇纤维混凝土和纤维素纤维混凝土,更适合用于提高隧道管片混凝土在火灾高温环境下的抗爆裂性能.
In this paper, the high temperature automatic acquisition system was designed based on the temperature sensor, and the in- side temperature of concrete was monitored under fire and high temperature environment, and effects of organic fiber on tunnel segment concrete properties after high temperature were studied. The experimental results showed that from the inside to the outside of concrete existing an obvious temperature gradient during the fire, synthetic organic fiber could obviously reduce the cracking and spalling of con- crete induced by the temperature gradient; decomposition temperature of polypropylene fiber was higher than that of cellulose fiber and polyvinyl alcohol fiber, the flexural strength, fracture energy, fracture toughness, and residual strength of polypropylene fiber rein- forced concrete were superior to polyvinyl alcohol fiber reinforced concrete and cellulose fiber reinforced concrete, so the polypropylene fiber was more suitable for improving the anti-crack performance of tunnel segment concrete in the high temperature environment.
出处
《华北水利水电学院学报》
2013年第1期32-36,共5页
North China Institute of Water Conservancy and Hydroelectric Power
基金
国家重点基础研究发展计划("973"计划)资助项目(2010CB735801)
关键词
隧道管片
高性能混凝土
有机纤维
力学性能
火灾高温
爆裂
tunnel segment
high performance concrete
organic fiber
mechanical property
high temperature
explosive spalling
