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