Study on Mechanical and Viscoelastic Properties of Asphalt Mixture Modified by Diatomite and Crumb Rubber Particles

Chunyu Liang,Jinxin Hao,Xin Xu,Hao Zhang,Zhengwei Gu

doi:10.3390/app10238748

Chunyu Liang, Jinxin Hao + Show 3 more

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https://doi.org/10.3390/app10238748

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Journal: Applied Sciences	Publication Date: Dec 7, 2020
Citations: 10	License type: CC BY 4.0

Affiliation: Jilin University

Abstract

To optimize the properties of asphalt mixtures and make full use of waste rubber tires, diatomite and crumb rubber particles were applied to reinforce the asphalt mixtures in this study. The rutting tests, the three-point bending tests, the freeze-thaw splitting tests, and the uniaxial compression creep tests were performed to analyze the effects of asphalt types and aggregate gradation on the pavement properties of diatomite and crumb rubber particles reinforced asphalt mixtures (DRPAM). Subsequently, the creep and relaxation characteristics of DRPAM were analyzed by the Burgers model, the modified Burgers model, the second-order extensive Maxwell model, and the Scott–Blair model. The results show that rubber particles and diatomite can reinforce the high temperature, low temperature, and viscoelastic properties of asphalt mixtures, although the improvement effect is weaker than styrene-butadiene-styrene (SBS). Consequently, it is concluded that rubber particle and diatomite compound modified asphalt mixture with suspension dense gradation and SBS binder will have better performance.

Highlights

With the rapid growth of the car ownership in recent decades, a large number of waste rubber tires are produced every year, which seriously polluted the environment and occupied arable land.it has been an urgent problem to recycle and reuse these waste tires, in which crushing waste tires into rubber powder or rubber particles and applying them to the highway construction industry has become one of the main development directions of waste tire treatment [1,2].Venudharan et al [3] evaluated the effect of crumb particles on rutting resistance and viscosity-temperature susceptibility base on temperature-frequency oscillation and multiple stress creep and recovery tests
It can be found that SBS modified asphalt mixtures have higher dynamic stability (DS) compared with the base asphalt mixtures, which implies that the high-temperature resistance to permanent deformation of compound modified asphalt mixture can be improved by using the SBS modified asphalt as the binder
This conclusion will be opposite after adding diatomite and rubber particles, indicating that the compound modified asphalt mixture with suspended dense gradation has better high-temperature performance, which is mainly because the addition of rubber particles with larger particle size and softer texture has an adverse effect on the framework embedding effect of framework dense asphalt mixtures

Summary

Introduction

It has been an urgent problem to recycle and reuse these waste tires, in which crushing waste tires into rubber powder or rubber particles and applying them to the highway construction industry has become one of the main development directions of waste tire treatment [1,2]. Venudharan et al [3] evaluated the effect of crumb particles on rutting resistance and viscosity-temperature susceptibility base on temperature-frequency oscillation and multiple stress creep and recovery tests. The results showed that the finer the crumb rubber particles in the gradation, the better the rutting resistance and the lower the viscosity-temperature sensitivity. Wang et al [4]. Et al [5] pointed out that crumb rubber particle size had an important impact on the low-temperature performance of asphalt mixtures. Wang et al [6] and Abdul Hassan et al [7]

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Results

Conclusion