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Open AccessArticle

Enhanced Storage Stability of Different Polymer Modified Asphalt Binders through Nano-Montmorillonite Modification

1
Research and Development Centre of Transport Industry of Technologies, Materials and Equipment of Highway Construction and Maintenance, Gansu Road and Bridge Group Co. Ltd., Lanzhou 730050, China
2
School of Civil Engineering and Transportation, South China University of Technology, Wushan Road, Tianhe District, Guangzhou 510000, China
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Key Laboratory for Special Area Highway Engineering, Chang’an University, Xi’an 710064, China
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Guangdong Guanyue Highway & Bridge Co., Ltd., Guangzhou 510000, China
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Guangdong Province Communications Planning & Design Institute Co., Ltd., Xinghua Road, Tianhe District, Guangzhou 510000, China
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Department of Civil Engineering and Environment, University of South Carolina, Columbia, SC 29208, USA
*
Authors to whom correspondence should be addressed.
Nanomaterials 2020, 10(4), 641; https://doi.org/10.3390/nano10040641
Received: 6 March 2020 / Revised: 17 March 2020 / Accepted: 21 March 2020 / Published: 30 March 2020
(This article belongs to the Special Issue Preparation and Application of Polymer Nanocomposites)
The storage stability concern, caused by phase separation for the density difference between polymers and asphalt fractions, has limited the widespread application of polymer modified asphalt (PMA). Therefore, this study aims to improve the storage concern of PMA by incorporating nano-montmorillonite. To this end, different nano-montmorillonites were incorporated to three PMAs modified with three typical asphalt modifiers, i.e., crumb rubber (CRM), styrene–butadiene-rubber (SBR) and styrene–butadiene-styrene (SBS). A series of laboratory tests were performed to evaluate the storage stability and rheological properties of PMA binders with nano-montmorillonite. As a consequence, the incorporation of nano-montmorillonite exhibited a remarkable effect on enhancing the storage stability of the CRM modified binder, but limited positive effects for the SBR and SBS modified binders. The layered nano-montmorillonite transformed to intercalated or exfoliated structures after interaction with asphalt fractions, providing superior storage stability. Among selected nano-montmorillonites, the pure montmorillonite with Hydroxyl organic ammonium performed the best on enhancing storage stability of PMA. This paper suggests that nano-montmorillonite is a promising modifier to alleviate the storage stability concern for asphalt with polymer modifiers. View Full-Text
Keywords: storage stability; rheological properties; polymer-modified asphalt; nano-montmorillonite storage stability; rheological properties; polymer-modified asphalt; nano-montmorillonite
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MDPI and ACS Style

Ren, Z.; Zhu, Y.; Wu, Q.; Zhu, M.; Guo, F.; Yu, H.; Yu, J. Enhanced Storage Stability of Different Polymer Modified Asphalt Binders through Nano-Montmorillonite Modification. Nanomaterials 2020, 10, 641.

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