不同胶凝材料的精细混凝土高温后力学性能

发布时间：2018-05-18 21:02

  本文选题：胶凝材料 + 精细混凝土　； 参考：《工程力学》2015年S1期

【摘要】：为了改善用于纤维编织网增强混凝土基体材料的精细混凝土的耐高温性能,该文进行了120个40mm×40mm×160mm棱柱体的高温后抗折强度试验和240个40mm×40mm×40mm立方体的高温后抗压强度试验。考察了不同胶凝材料对精细混凝土试件高温后力学性能的影响,包括外掺纳米材料以及以高铝水泥作为主要胶凝材料的影响。结果表明:体积掺量为1.5%和3.0%纳米Si O2气凝胶粉末未能改善精细混凝土的耐高温性能,质量掺量为5.0%纳米陶瓷粉在目标温度TR=800℃时使基体混凝土的抗压和抗折强度分别提高84.2%和120.9%。当TR=800℃时,采用高铝水泥作为主要胶凝材料的试件力学性能均比普通精细混凝土试件大幅提高;各组掺入活性粉末的高铝水泥混凝土试件在TR=800℃时,相对抗压和抗折强度均比未掺活性粉末时有所提高。
[Abstract]:In order to improve the high temperature resistance of fine concrete used for fiber woven mesh reinforced concrete matrix material, 120 40mm 脳 40mm 脳 160mm prisms were tested for flexural strength after high temperature and 240 40mm 脳 40mm 脳 40mm cubes were tested for compressive strength after high temperature. The effects of different cementing materials on the mechanical properties of fine concrete specimens after high temperature were investigated, including the effects of nano-doped materials and high alumina cement as the main cementitious materials. The results showed that the volume addition of 1.5% and 3.0% nano-SiO _ 2 aerogel powder could not improve the high temperature resistance of fine concrete. The compressive strength and flexural strength of the matrix concrete were increased by 84.2% and 120.9at the target temperature of TR=800 鈩，

本文编号：1907195