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Open AccessArticle

Modification of Asphalt Rubber with Nanoclay towards Enhanced Storage Stability

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School of Civil Engineering and Transportation, South China University of Technology, Wushan Road, Tianhe District, Guangzhou 510000, China
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Institute of Construction and Architecture, Moscow State University of Civil Engineering, Yaroslavskoe Shosse, Moscow 129337, Russia
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Sonny Astani Department of Civil and Environmental Engineering, University of Southern California, Los Angeles, CA 90098, USA
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Department of Civil Engineering and Environment, University of South Carolina, Columbia, SC 29205, USA
*
Author to whom correspondence should be addressed.
Materials 2018, 11(11), 2093; https://doi.org/10.3390/ma11112093
Received: 27 August 2018 / Revised: 21 September 2018 / Accepted: 27 September 2018 / Published: 25 October 2018
(This article belongs to the Special Issue New and Emerging Construction Materials)
Asphalt rubber (AR), which is prepared by blending crumb rubber and bitumen, provides various advantages, including superior rutting resistance, lower road-tire noise and longer service life. However, contractors have expressed concerns regarding its poor storage stability, which in turn limits its wider application. This study aims to address the storage stability concern by incorporating nano-montmorillonite (nanoclay). Three types of nanoclay were dispersed into hot AR binder by high shear blending. The rheological properties of nanoclay-crumb rubber modifier (CRM)-modified bitumen were evaluated through Superpave performance grade (PG) tests and the storage stability was characterized by measuring the difference in softening points or complex moduli at the top and bottom portions of binders after lab-simulated storage. X-ray diffraction (XRD) evaluation was conducted to observe the variation of nanoclay layer gap distance for mechanism investigation. It was found that all selected nanoclays had insignificant effects on workability, rutting and fatigue properties. The layered nanoclay transformed to intercalated or exfoliated structures after interaction with bitumen fractions, providing superior storage stability. Among the three selected nanoclays, pure montmorillonite with Na+ inorganic group, which has an intermediate hydrophilic property and middle layer gap, showed the most obvious effect on enhancing the storage stability of AR. View Full-Text
Keywords: storage stability; asphalt rubber; nanoclay; rheological properties storage stability; asphalt rubber; nanoclay; rheological properties
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MDPI and ACS Style

Yu, J.; Ren, Z.; Yu, H.; Wang, D.; Svetlana, S.; Korolev, E.; Gao, Z.; Guo, F. Modification of Asphalt Rubber with Nanoclay towards Enhanced Storage Stability. Materials 2018, 11, 2093.

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