Abstract

To examine the compressive dynamic performance of rubber concrete, a uniaxial compression experimental study on rubber concrete was carried out using a hydraulic servo based on five different rubber substitution rates under eight different earthquake magnitude loading strain rates. The compressive failure modes and stress-strain curves of rubber concrete were obtained. By comparatively analyzing the mechanical characteristics of rubber concrete under different loading conditions, the following conclusions are drawn: with the increase in rubber substitution rate, the integrity of concrete upon compressive failure is gradually improved, and rubber particles exhibit an evident modification effect on cement mortar at the concrete interface. Under the influence of loading strain rate, the patterns of compressive failure mode of rubber concrete with different substitution rates are similar to that of ordinary concrete. Under the same loading strain rate, with the increase in rubber substitution rate, the compressive strength of rubber concrete gradually decreases while the plastic deformation capacity gradually increases. For the same rubber substitution rate, the compressive strength and elastic modulus of rubber concrete gradually increases with the increase in loading strain rate. The increase in rubber substitution rate gradually reduces the increasing amplitude of compressive strength and elastic modulus of rubber concrete under the influence of loading strain rate. Meanwhile, an equation was proposed to describe the coupling effect of rubber substitution rate and strain rate on the compressive strength dynamic increase factor of rubber concrete, and the underlying stress mechanism was further discussed. These results have significance in promoting the application of rubber concrete in engineering practice.

Highlights

  • Rubber concrete is a type of green building material formed by replacing all or part of the aggregates in ordinary concrete with rubber particles

  • Yuan et al (2010) conducted an experimental study on the compressive dynamic performance of low substitution rubber concrete by considering collision magnitude strain rate. Their results implied that the increasing amplitude of the compressive strength of rubber concrete under the influence of loading strain rate gradually decreased with the increase in rubber substitution rate

  • To further explore the effects of rubber substitution rate and loading strain rate on the compressive dynamic performance of rubber concrete, the data on compressive strength, elastic modulus, and ultimate strain were extracted from the stress-strain curves of rubber concrete specimens under different loading conditions, as shown in Figure 8, and were used to analyze the changing trends of rubber concrete mechanical characteristic parameters under the influence of rubber substitution rate and loading strain rate

Read more

Summary

Introduction

Rubber concrete is a type of green building material formed by replacing all or part of the aggregates in ordinary concrete with rubber particles. Yuan et al (2010) conducted an experimental study on the compressive dynamic performance of low substitution rubber concrete by considering collision magnitude strain rate. Their results implied that the increasing amplitude of the compressive strength of rubber concrete under the influence of loading strain rate gradually decreased with the increase in rubber substitution rate. No study has yet been reported on the mechanical performance of rubber concrete while considering the influence of earthquake magnitude strain rate and high substitution rate. By considering different rubber substitution rates and earthquake magnitude loading strain rates, this study aims to examine the compressive dynamic performance of rubber concrete using a hydraulic servo. A relationship equation for describing the coupling effect of rubber substitution rate and loading strain rate on the mechanical parameters of rubber concrete from a quantitative perspective was established, and the underlying stress mechanism was further discussed

Specimen design and mix proportion
Experimental loading scheme and equipment
Mechanical performance under static strain rate
Failure mode
Stress-strain curve
Characteristic parameters
Compressive strength
Deformation parameters
Findings
Conclusions
Full Text
Published version (Free)

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call