Effect of Crumb Rubber Modifier Particle Size on Storage Stability of Rubberized Binders

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

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

Abstract: This research study aimed to assess the influence of different particle sizes of crumb rubber modifier on phase separation when mixed with virgin asphalt binder (PG 64-22). Both Superpave and multiple stress creep recovery (MSCR) tests were conducted to determine the optimal particle size. Three sizes of crumb-rubber particles (≤0.5 mm, ≤1 mm, and 1–2 mm) were individually incorporated into the binder at a weight proportion of 10%. The findings revealed that an increase in particle size resulted in higher viscosity, which reduced workability. However, the use of particles with a size of ≤0.5 mm effectively decreased viscosity. Furthermore, larger particle sizes enhanced resistance to rutting and improved the lifespan of the pavement. Multiple shear creep recovery (MSCR) tests confirmed that larger crumb-rubber particles exhibited a higher load-bearing capacity. Additionally, phase separation studies demonstrated that larger particle sizes were associated with increased phase separation. Notably, particles with a size of ≤0.5 mm performed exceptionally well in reducing phase separation across all combinations. In conclusion, crumb-rubber particles with a size of ≤0.5 mm were identified as the most effective in minimizing phase separation when blended with virgin asphalt binder. These findings provide solid scientific evidence related to the effects of crumb-rubber particles on the storage stability of rubberized asphalt binder and have significant implications for future research in this field.

Keywords: crumb rubber modifier (CRM); particle sizes; phase separation; superpave; multiple stress creep recovery (MSCR) (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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