Properties of Crumb Rubber and Latex Modified Asphalt Binders using Superpave Tests

Muslich Sutanto,Sri Sunarjono,Kemal Al Zaro,Nura Bala,M Raza Ul Mustafa,I Bin Othman,M Latheef,N Zulaikha Bt Yusof,D Bayu Endrayana

doi:10.1051/matecconf/201820305007

Muslich Sutanto, Sri Sunarjono + Show 7 more

Open Access

https://doi.org/10.1051/matecconf/201820305007

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Abstract

Polymer modified binders have been used for long time to improve the quality of asphalt pavement. This study investigates the effect of crumb rubber and latex on the properties of bitumen binders. Crumb rubber and latex were added to the control 60/70 pen grade bitumen. Four different proportions of crumb rubber and latex were considered in this study: 0%, 4%, 6% and 8% by weight of bitumen binder. The effect of crumb rubber and latex were evaluated through standard penetration and softening point tests as well as dynamic shear rheometer (DSR) test. Temperature ranges of 20°C - 40°C were used for the DSR rheological testing. The results showed that the addition of crumb rubber and latex leads to a promising improvement on the binder properties. A reduction in penetration and an increase in softening point temperature were observed with the addition of either crumb rubber or latex, this indicates improvement in stiffness and rutting resistance. The analysis on DSR results also show that the modified binders have good rutting resistance.

Highlights

Rutting and fatigue cracking are the two main parameters dictating the life of asphalt pavement structure, the improvement of asphalt binders in order to sustain large stresses during pavement’s service life is of significant importance
Rutting in asphalt pavements lead to the reduction in both structural and service life performance of the pavement
The modified binders were prepared using a bench-top multi mix high shear mixer by adding various percentages (4%, 6% and 8%) of crumb rubber and latex by weight of bitumen binder. 60/70 pen grade binder was used for this study, additives were added to the required amount of base binder at a high shearing rate of 4000 rpm, the mixing continued for duration of 2 hours until crumb rubber and latex dissolves completely on the base binder

Summary

Introduction

Rutting and fatigue cracking are the two main parameters dictating the life of asphalt pavement structure, the improvement of asphalt binders in order to sustain large stresses during pavement’s service life is of significant importance. Rutting in asphalt pavements lead to the reduction in both structural and service life performance of the pavement. The trend of significant increase in traffic volumes and axle loads coupled with poor bitumen performance on different weather conditions, results in placing much emphasis in its modification to resist defects like moisture damages, deformations and fatigue cracking [5]. Polymers such as thermoplastic elastomers and plastomers were found to be among the best materials for bitumen modification after yielding several improvements on the modified binders [6, 7]. The major benefits recorded in applying polymers are reduction in temperature sensitivity, increasing resistance to permanent deformation, higher stiffness at high temperature, good moisture resistance, resistance to cracking at lower temperatures, and longer fatigue life [8, 9]

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