高温及不同冷却方式对混掺纤维RPC强度的影响及红外检测  

Effect of high temperature and different cooling methods on blended fiber RPC strength and infrared detection

作　　者：郭银河 杜红秀[1] 贺一轩 GUO Yinhe;DU Hongxiu;HE Yixuan(Building Materials and Disaster Prevention and Mitigation Institute,College of Civil Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学土木工程学院建筑材料与防灾减灾所,山西太原030024

出　　处：《混凝土》2022年第3期171-174,共4页Concrete

基　　金：国家自然科学基金资助(51478290)。

摘　　要：为探究不同冷却方式对高温后混掺纤维RPC物理力学性能的影响,对混掺聚丙烯纤维和玄武岩纤维的RPC试件进行模拟火灾试验,通过自然冷却和喷水冷却两种方式将高温后试件冷却至常温,测试RPC试件质量、抗压强度、抗折强度、红外热像温升及其随受火温度的变化情况。结果表明:两种冷却条件下,随受火温度的升高,RPC的抗压强度及抗折强度总体均呈下降趋势,其红外平均温升均呈升高趋势;受火温度相同情况下,自然冷却的RPC抗压强度、抗折强度高于喷水冷却的抗压强度、抗折强度;不超过300℃时,自然冷却的RPC抗压强度较常温略有增加,200℃时喷水冷却的RPC抗折强度骤降;相较于自然冷却,喷水冷却的RPC试件红外热像温升更高;红外热像温升与抗压强度、抗折强度相关性均较好。In order to explore the effect of different cooling methods on the physical and mechanical properties of hybrid fiber RPC after high temperature,it conducted a simulated fire test on RPC specimens mixed with polypropylene fiber and basalt fiber.The specimens after high temperature were cooled to normal temperature by two methods of natural cooling and water spray cooling,and the quality,compressive strength,flexural strength,infrared thermal image temperature rise of the RPC specimen and their changes with fire temperature were tested.The results show that under the two cooling conditions,with the increase of the fire temperature,the compressive strength and flexural strength of RPC showed a downward trend,and the average infrared temperature rise showed an upward trend.Under the same fire temperature,the compressive strength and flexural strength of natural cooling RPC are higher than those of water spray cooling.When the temperature does not exceed 300℃,the compressive strength of RPC under natural cooling is slightly increased compared with normal temperature.The flexural strength of RPC cooled by water spraying drops sharply at 200℃.Compared with natural cooling,the temperature rise of infrared thermal image of RPC specimens cooled by water spray is higher.Infrared thermal image temperature rise has good correlation with compressive strength and flexural strength.

关 键 词：混掺纤维RPC 高温 冷却方式 力学性能 红外热像 

分 类 号：TU528.01[建筑科学—建筑技术科学]