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Abstract
The present study aims to examine the effect of modifiers (Styrene-Butadiene-Styrene and crumb rubber) on the rutting, moisture-induced damage, and workability properties of hot mix asphalt (HMA) mixtures. In this study, three types—namely, control (CB), crumb rubber-modified (CRMB), and polymer-modified (PMB)—of mixtures/binders were evaluated. The rutting properties were evaluated using a wheel tracking device and the Multiple Stress Creep Recovery (MSCR) test. The moisture-induced damage properties were evaluated using the Indirect Tensile Strength (modified Lottman) and bitumen bond strength (BBS) tests. The workability properties were evaluated using densification indices (Bahia and locking point method) and a viscosity test. The results indicate that CRMB mixtures were less workable and exhibited a better resistance to rutting than the PMB and CB mixtures. Further, the PMB mixtures had increased resistance to moisture-induced damage, while the effect of the CRMB mixtures was negligible compared to the CB mixtures.
Highlights
The use of modifiers such as polymers and recycled crumb rubber has been gaining popularity in recent decades
The results clearly indicate that a lower density was observed for the crumb rubber-modified (CRMB) and PMB mixtures compared to the control binder (CB) mixtures
Increases in the Traffic Densification Index (TDI) values by 86.2% and 51.9% were observed for the CRMB and PMB mixtures compared to the CB mixture when calculated using the locking point method
Summary
The use of modifiers such as polymers and recycled crumb rubber has been gaining popularity in recent decades It has been successfully adopted by transportation agencies in hot mix asphalt (HMA) pavements due to the environmental benefits and ability to improve the performance of asphalt mixtures related to rutting and moisture-induced damage [1,2,3]. Water accumulation results in hydroplaning, which is a safety hazard for vehicles [10] To tackle this rutting problem in the pavement, several studies have been conducted, resulting in the development of rutting models and concepts and the invention of testing methods. Previous studies conducted on HMA mixtures with the use of polymers and recycled crumb rubber have exhibited a better resistance to rutting [1,2,11,14,15,16]. It is important to note that the majority of the reported work on the rutting of asphalt binder has utilized the Superpave rutting parameter (G*/sinδ), which is unsuitable for characterizing
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