Effect of Diatomite and Basalt Fibers on Pavement Performance and Vibration Attenuation of Waste Tires Rubber-Modified Asphalt Mixtures

Chunli Wu,Baigeng Guan,Liding Li,Renbing Wang,Zehua Lv,Yongchun Cheng,Zhengwei Gu

doi:10.1155/2020/8853428

Abstract

As an eco-friendly pavement material, waste tires rubber-modified asphalt mixtures (WRMs) have been applied in pavement engineering widely. To further improve the performance and adaptability of WRM, diatomite and basalt fibers are, respectively, added to WRM. Subsequently, the Marshall tests, the rutting tests, the low-temperature splitting tests, the freeze-thaw splitting tests, and the vibration attenuation tests are conducted to study the effect of diatomite and basalt fibers on pavement properties of WRM. Furthermore, the correlation degree between the content of diatomite, basalt fibers, asphalt, and the pavement properties of WRM is analysed by the grey correlation grade analysis (GCGA). The results show that the addition of diatomite and basalt fibers can significantly improve the pavement and vibration attenuation properties of WRM. The improvement of high-temperature permanent deformation resistance, low-temperature cracking resistance, and water damage resistance of WRM is mainly attributed to diatomite, basalt fibers, and asphalt-aggregate ratio, respectively. The improvement of the vibration attenuation of WRM by diatomite and basalt fibers is mainly attributed to the increase of waste tires rubber-modified asphalt (WRA) content caused by adding diatomite and basalt fibers.

Highlights

With the increase of global car ownership, a large number of waste tires have been produced, which seriously pollutes the natural environment and occupies a large number of land resources
Three types of asphalt mixtures were prepared, namely, waste tires rubber-modified asphalt mixtures (WRMs), diatomite reinforced WRM (DWRM), and basalt fibers reinforced WRM (BWRM). e three types of asphalt mixtures were divided into seven groups: WRM, DWRM with 5 wt.% diatomite, 7.5 wt.% diatomite, and 10 wt.% diatomite, BWRM with 0.2 wt.% basalt fibers, 0.3 wt.% basalt fibers, and 0.4 wt.% basalt fibers, and the specific preparation scheme is shown in Table 5. e content of diatomite and basalt fibers is determined by the previous research [28,29,30]
With the increase of diatomite content, volume of air voids (VV) of DWRM decreases gradually, and, with the increase of basalt fibers content, VV of BWRM increases gradually. e addition of diatomite increases the content of waste tires rubber-modified asphalt (WRA), the colloid composed of asphalt and diatomite can occupy more space between the aggregates, which raises voids filled with asphalt (VFA) of asphalt mixtures, reducing VV of asphalt mixtures

Summary

Introduction

With the increase of global car ownership, a large number of waste tires have been produced, which seriously pollutes the natural environment and occupies a large number of land resources. Recycling these waste tires is an urgent problem to be solved. Some studies pointed out that the addition of WR to the asphalt mixtures could improve the performance of antideformation at high temperature and anticrack at low temperature [6, 10,11,12]. WRM exhibited more excellent recoverable strain than the styrenebutadiene-styrene modified asphalt mixtures [16]

Methods

Results

Conclusion