Evaluation of Permanent Deformation of Unmodified and Rubber-Reinforced SMA Asphalt Mixtures Using Dynamic Creep Test

Mohd Rasdan Ibrahim,Herda Yati Katman,Suhana Koting,Mohamed Rehan Karim,Nuha Salim Mashaan

doi:10.1155/2015/247149

Mohd Rasdan Ibrahim, Herda Yati Katman + Show 3 more

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https://doi.org/10.1155/2015/247149

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Abstract

This paper presents the evaluation of permanent deformation of rubber-reinforced SMA asphalt mixtures by using dynamic creep test. The effect of trans-polyoctenamer as a cross-linking agent in permanent deformation of rubberized mixtures was also evaluated. Dynamic creep test was conducted at different stress levels (200 kPa, 400 kPa) and temperatures (40°C, 50°C). Permanent deformation parameters such as dynamic creep curve, ultimate strain, and creep strain slope (CSS) were used to analyse the results. Finally, the creep behaviour of the specimens was estimated by the Zhou three-stage creep model. The results show that crumb rubber and trans-polyoctenamer significantly affected the parameters especially at high stress and temperatures. Consistent findings were observed for all permanent deformation parameters. Moreover, based on Zhou model, it was concluded that resistance to permanent deformation was improved by application of crumb rubber and trans-polyoctenamer.

Highlights

Mechanical behaviour of asphalt highly depends on ambient temperature due to its viscoelastic properties
Due to hot weather with an increase in traffic loading experienced in Malaysia, this study was conducted to investigate the permanent deformation of commonly used aggregate gradation, SMA 20
Mid-pt Lower limit Upper limit asphalt prepared with 12% of crumb rubber, whereas 12R 4.5V is rubberized asphalt prepared with 12% crumb rubber and 4.5% trans-polyoctenamer

Summary

Introduction

Mechanical behaviour of asphalt highly depends on ambient temperature due to its viscoelastic properties. Asphalt binder becomes more susceptible to adopt permanent deformation and accelerates rutting in wheel tracks. Stress induced by loading is another main parameter that leads to permanent deformation in asphalt pavement. Rutting is observed as the main distress mechanism typically occurring in countries with high pavement in-service temperature like Malaysia. In 2008, 27% or 270,000 out of the one million registered commercial vehicles on the roads in the country were commonly overloaded. Overloading of such with high environmental temperature could cause great damage to pavements and deteriorate pavement performance faster than planned

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