Performance Evaluation of Crumb Rubber with Kaolin Modified Asphalt for Sustainability of Flexible Pavement

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Date

2025-05

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Addis Ababa University

Abstract

The growth of traffic demand needs sustainable and durable asphalt pavement. Currently the price of bitumen has increased due to the increase in price of crude oil. Sustainable and durable pavement materials are needed to partially replace bitumen. This research aims to evaluate the performance of crumb rubber with kaolin modified bitumen asphalt for sustainability of flexible pavement. An experimental type of research was conducted to evaluate the properties of crumb rubber with kaolin modified asphalt. Six different content of CR and kaolin added to 80/100 penetration grade bitumen by weight. Physical and rheological test including penetration, ductility, softening point test, flash and fire point test, RTFOT and DSR test was conducted for both control and modified binder. Double wheel track test, indirect tensile modulus test and ITS test were conducted for control and modified asphalt mixture to evaluate the mechanical performance of asphalt. The result of study indicates crumb rubber and kaolin bitumen modification improves the physical and rheological properties of asphalt binder. Both CR and kaolin modified binder improves the stiffness, temperature susceptibility and elastic property of asphalt binder. One way ANOVA statistical analysis indicates that kaolin and crumb rubber has a significance effect on physical properties of binder. Based on the outcome of the study the optimum content of crumb rubber and kaolin were found as 3.5% and 10% respectively. 3.5% CR, 10% kaolin and the optimum combined mix improves rutting resistance of asphalt by 52.2%, 52.1% and 73.9%. These materials also improve load associated cracking and moisture damage effect of asphalt concrete. Crumb rubber and kaolin modified asphalt can reduce economical cost by 12.3% as compared to the conventional asphalt.

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Keywords

Crumb rubber, kaolin, Superpave, modified asphalt, Sustainability

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