Mechanical properties of fiber nano-modified rubber concrete in high temperature

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%.

Keywords:

• Steel fiber
• rubber concrete
• mechanical properties
• fatigue test

Additional information

Funding

This research was financially supported by Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University (No. 201708).