A Laboratory Investigation Regarding Storage Stability of the CRM-Modified Bitumen—CRM Processing Method (Untreated vs. Treated)

Jihyeon Yun, Shyaamkrishnan Vigneswaran, Moon-Sup Lee () and Soon-Jae Lee
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Jihyeon Yun: Department of Engineering Technology, College of Science & Engineering, Texas State University, San Marcos, TX 78666, USA
Shyaamkrishnan Vigneswaran: Department of Engineering Technology, College of Science & Engineering, Texas State University, San Marcos, TX 78666, USA
Moon-Sup Lee: Korea Institute of Civil Engineering and Building Technology, Goyang-si 10223, Gyeonggi, Republic of Korea
Soon-Jae Lee: Department of Engineering Technology, College of Science & Engineering, Texas State University, San Marcos, TX 78666, USA

Sustainability, 2023, vol. 15, issue 14, 1-18

Abstract: The aim of this study is to analyze the phase separation that occurs between treated and untreated rubber crumb particles produced by wet processes in the laboratory. The percentage of replacement used for both the treated and untreated crumb rubber-modified asphalt (CRMA) was 5%, 10%, 15%, and 20%. Tests to evaluate binder properties were performed using a rotational viscometer and a DSR, and the following properties were determined—viscosity, G*/sin δ , % recovery, and J nr . The phase separation study was analyzed using the viscosity and G*/sin δ results. In general, the results of the study show the following. (1) The treated CRMA binders had higher viscosity values than untreated CRMA binders, although some values could not be measured due to the high viscosity values. (2) The G*/sin δ , % recovery and J nr results also had a similar trend with viscosity results. (3) The viscosity and G*/sin δ phase separation values demonstrate that treated CRMA binders perform better than untreated CRMA binders. (4) Different experimental methods have shown variations in the calculated SI value; hence, a more improved approach should be explored to accurately assess the storage stability of asphalt binders containing various additives.

Keywords: CRMA; treated; untreated; phase separation (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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