Stabilization mechanism and rheological properties of sustainable cold-mixed high rubber content emulsified asphalt
Document Type
Article
Publication Date
11-8-2024
Department
Department of Civil, Environmental, and Geospatial Engineering
Abstract
Discarded rubber tires, categorized as industrial waste, are escalating in volume and pose significant environmental concerns. The present investigation is designed to engineer a novel strategy for the valorization of end-of-life tires by fabricating rubber powder-modified emulsified asphalt through a one-time cold mixing process. Microscopic tests and chemical analyses were conducted to investigate the microscopic morphology, distribution, and chemical alterations of emulsified asphalt evaporation residue at varying rubber powder dosages. The microscopic properties of emulsified asphalt residue were examined to elucidate the molding and stabilization mechanism of emulsified asphalt. Rheological properties of emulsified asphalt evaporation residues with different rubber powder contents were analyzed. The results revealed that the emulsified asphalt, when fortified with appropriately treated rubber powder, not only achieves stable emulsification but also exhibits commendable storage stability. An optimal dispersion of the rubber powder within the emulsified asphalt matrix was observed at concentrations up to 12 % by weight. Beyond this threshold, specifically at a 15 % rubber powder concentration, the distribution became uneven, leading to localized aggregation within the mixture. The study suggests that a rubber powder dosage of 12 % is the most efficacious, as it not only ensures a homogenous blend but also significantly bolsters the strength of the emulsified asphalt's evaporated residue. This enhancement in strength is particularly beneficial for improving the high-temperature rheological performance of the asphalt, a critical factor in pavement construction. This research provides insights into the application of rubber powder in pavement construction, offering an environmentally beneficial method for tire disposal and contributing to the long-term sustainability of road construction.
Publication Title
Construction and Building Materials
Recommended Citation
You, L.,
Li, X.,
Zhu, X.,
Si, C.,
Long, Z.,
Diab, A.,
You, Z.,
&
Awed, A.
(2024).
Stabilization mechanism and rheological properties of sustainable cold-mixed high rubber content emulsified asphalt.
Construction and Building Materials,
450.
http://doi.org/10.1016/j.conbuildmat.2024.138620
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p2/1137