Abstract

Basalt fiber and crumb rubber, as excellent road material modifiers, have great advantages in improving the mechanical properties and fracture behavior of concrete. Acoustic emission (AE) is a nondestructive testing and real-time monitoring technique used to characterize the fracture behavior of concrete specimens. The object of this paper is to investigate the effects of crumb rubber replacement rate, basalt fiber content and water–binder ratio on the mechanical properties and fracture behavior of crumb rubber basalt fiber concrete (CRBFC) based on orthogonal test. The fracture behavior of a CRBFC specimen under three-point flexural conditions was monitored by AE technology and the relative cumulative hit (RCH) was defined to characterize the internal damage degree of CRBFC. The experimental results showed that, considering the mechanical strength and fracture damage behavior of CRBFC, the optimal crumb rubber replacement rate, basalt fiber content and water–binder ratio are 10%, 2 kg/m3 and 0.46, respectively. In addition, it was found that AE parameters can effectively characterize the fracture behavior of CRBFC. The fracture stages of CRBFC can be divided according to the cumulative AE hits and counts. AE amplitude value can be used as an early warning of CRBFC specimen fracture. Moreover, the fracture mode can be identified by RA and average frequency (AF) values variation during the loading process.

Highlights

  • In recent years, the output of waste tires has increased greatly with the rapid development of the automobile industry

  • It was found that Acoustic emission (AE) parameters can effectively characterize the fracture behavior of crumb rubber basalt fiber concrete (CRBFC)

  • The purpose of this study is to reduce the production cost of concrete, improve the mechanical properties of concrete and realize the recycling and reuse of waste rubber

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Summary

Introduction

The output of waste tires has increased greatly with the rapid development of the automobile industry. The waste rubber is not biodegradable and excessive waste rubber causes secondary pollution, increasing the burden on the ecological environment [3]. The recycling technology for waste rubber has gradually matured with the development of industrial technology and waste rubber has been used in the fields of manufacturing tires, modified asphalt and elastic floor tiles. Adding crumb rubber, produced by waste rubber tires, into concrete can realize the recycling and reusing of waste rubber, meeting the requirements of environmentally sustainable development [6,7]. The addition of crumb rubber can improve the freeze–thaw durability of concrete [8] and the resistance to chloride ion penetration [9].

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