Durability Evaluation Study for Crumb Rubber–Asphalt Pavement

Xuancang Wang,Zhenyang Fan,Li Li,Minghui Huang,Hongyao Wang

doi:10.3390/app9163434

Xuancang Wang, Zhenyang Fan + Show 3 more

Open Access

https://doi.org/10.3390/app9163434

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Abstract

In this study, the failure mechanism of crumb rubber–asphalt pavement was analyzed under the combined effects of low temperature, water, and traffic load. The investigation was carried out based on the mechanical and deformational properties of crumb rubber–asphalt mixture and the typical environmental and load conditions such pavement is typically exposed to. A method was proposed for objective evaluation of the interfacial adhesion between rubber crumbs and asphalt through consideration of the effects of the characteristics of the materials and the working environment. The main evaluation method used herein included the indirect tensile strength test under freeze–thaw–boiling cycle, and the Cántabro abrasion test under water-immersion was adopted as an auxiliary method. The evaluation system has the advantages of simple implementation, realistic simulation of the actual working state of the mixture, and reliable results. Moreover, it is a durability evaluation method that can be specifically applied to asphalt mixtures with some special aggregates or stone mastic asphalt (SMA) mixtures.

Highlights

Crumb rubber–asphalt mixture is a new type of deicing pavement material prepared by replacing some of the aggregates in asphalt mixture with mechanically sheared particles of waste rubber tires and mixing them uniformly with high-performance modified asphalt [1,2,3,4,5,6]
In order to verify the effectiveness of the evaluation method mentioned above, this study used the standard method and the method proposed in this study to investigate crumb rubber–asphalt mixture (CR-reinforced stone mastic asphalt (SMA)-16) [52] mixed with five different asphalts [36,53]
The analysis shows that the durability evaluation methodevaluation for crumb rubber–asphalt mixtures proposed in asphalt mixture

Summary

Introduction

Crumb rubber–asphalt mixture is a new type of deicing pavement material prepared by replacing some of the aggregates in asphalt mixture with mechanically sheared particles of waste rubber tires and mixing them uniformly with high-performance modified asphalt [1,2,3,4,5,6]. An investigation has generally shown early damage to the domestic crumb rubber–asphalt pavement test roads for snow-melting [8]. This is mainly ascribed to the insufficient adhesive force between rubber crumbs and bitumen; the rubber crumbs detach from the road surface under load [9]. The durability problem of the crumb rubber–asphalt mixture can be attributed to the lack of adhesion between the asphalt and various aggregates, especially crumb rubber, and the water instability [11]. The lack of convenient and effective durability evaluation methods seriously hinders the performance research and engineering application progress of crumb rubber–asphalt pavement [16,17]

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Conclusion