Abstract

The purpose of this study is to explore the mechanical properties of fiber nano-modified rubber concrete in high temperature. In this study, ordinary C30 concrete was used as the test benchmark, and 10% by volume of five kinds of rubber particles were used to replace fine aggregate to prepare rubber concrete (RC). On this basis, steel fibers with a volume ratio of 0%, 0.5%, 1.0%, 1.5% and 2.0% were added to make fully mixed steel fiber rubber concrete (SFRRC), according to the completely mixed steel fiber rubber concrete (SFRRC) Compression test, split tensile test, 4-point bending test, and fatigue test of steel fiber rubber concrete (SFRRC) with three stress levels, studied the fully mixed steel fiber rubber concrete (SFRRC) machinery of various steel fiber mixed materials Properties and the effects on the fatigue life, fatigue probability distribution law and damage progression law of steel fiber rubber concrete. The test results show that the combination of steel fiber and nano-silica can increase the crack resistance of 600-degree high-temperature concrete to 57.19% and the maximum separation tensile strength to 269.09%.

摘要

本研究的目的是探索纤维纳米改性橡胶混凝土在高温下的力学性能。本研究以普通C30混凝土为试验基准，采用10%体积的5种橡胶颗粒代替细骨料制备橡胶混凝土（RC）。在此基础上，加入体积比为0%、0.5%、1.0%、1.5%和2.0%的钢纤维制成全混合钢纤维橡胶混凝土（SFRRC）。 ) 钢纤维橡胶混凝土（SFRRC）三种应力水平的压缩试验、劈拉试验、4点弯曲试验和疲劳试验，研究了各种钢纤维混合材料的全混合钢纤维橡胶混凝土（SFRRC）机械性能和对疲劳寿命的影响，钢纤维橡胶混凝土疲劳概率分布规律及损伤进展规律[J]. 试验结果表明，钢纤维与纳米二氧化硅的结合可使600度高温混凝土的抗裂性能提高到57.19%，最大分离抗拉强度提高到269.09%。