高强高性能混凝土高温后超声检测及压汞分析
发布时间：2018-08-19 07:16
【摘要】：为了研究高温后高强高性能混凝土的抗爆裂性能,对掺加0、0.2%聚丙烯纤维的C60高强高性能混凝土进行模拟高温试验,测试高温后混凝土的超声参数及轴心抗压强度,建立混凝土超声声速与受火温度及轴心抗压强度的关系;对常温、300、500、700℃分别掺加0、0.2%纤维的高强高性能混凝土进行压汞实验,分析纤维对混凝土内部孔隙影响。结果表明:随受火温度的提高,混凝土高温损伤趋于严重,总孔隙率、平均孔径、宏观孔所占比例均趋于增大。掺加纤维的有利方面主要体现在纤维受热熔化,降低了混凝土内部的蒸汽压力,减轻了劣化程度,高温后掺纤维混凝土比素混凝土超声声速、轴心抗压强度有所提高,平均孔径、宏观孔比例较小,一定程度上改善了混凝土的高温性能。
[Abstract]:In order to study the crack resistance of high strength and high performance concrete (HHPC) after high temperature, the high strength and compressive strength of C60 high strength concrete mixed with 0. 2% polypropylene fiber were tested by simulated high temperature test, and the ultrasonic parameters and axial compressive strength of concrete after high temperature were tested. The relationship between ultrasonic sound velocity of concrete and fire temperature and axial compressive strength was established, and the mercury injection experiment of high strength and high performance concrete mixed with 0 0. 2% fiber at room temperature of 300 500 700 鈩，
本文编号：2191044
[Abstract]:In order to study the crack resistance of high strength and high performance concrete (HHPC) after high temperature, the high strength and compressive strength of C60 high strength concrete mixed with 0. 2% polypropylene fiber were tested by simulated high temperature test, and the ultrasonic parameters and axial compressive strength of concrete after high temperature were tested. The relationship between ultrasonic sound velocity of concrete and fire temperature and axial compressive strength was established, and the mercury injection experiment of high strength and high performance concrete mixed with 0 0. 2% fiber at room temperature of 300 500 700 鈩，
本文编号：2191044
本文链接：https://www.wllwen.com/kejilunwen/huaxuehuagong/2191044.html
