Research Progress on Warm-Mix and Odor-Reduction Technologies for CR/SBS Composite Modified Asphalt

Ling Zhu

doi:10.6919/ICJE.202603_12(3).0030

Authors

Ling Zhu

DOI:

https://doi.org/10.6919/ICJE.202603_12(3).0030

Keywords:

CR/SBS Composite Modified Asphalt; Warm-Mix Technology; Odor-Reduction Technology; VOCs; Fume Emission Reduction.

Abstract

SBS-modified asphalt has been widely used in the construction of high-grade highways because of its excellent high- and low-temperature performance, fatigue resistance, and durability. However, SBS-modified asphalt still suffers from problems such as relatively high cost and insufficient storage stability. Crumb rubber (CR)-modified asphalt can realize the resource utilization of solid waste and shows certain advantages in improving asphalt elasticity and high-temperature performance, but it also has shortcomings such as poor high-temperature storage stability, high construction viscosity, and susceptibility to phase separation. To simultaneously satisfy the requirements of pavement performance, storage stability, and resource utilization, CR/SBS composite modification has gradually become a research focus. Existing studies have shown that the composite modification of CR and SBS can significantly improve the high-temperature rutting resistance, low-temperature cracking resistance, and fatigue performance of asphalt and asphalt mixtures through the synergistic effects of rubber elasticity and polymer network structure. However, it also leads to problems such as increased system viscosity, elevated construction temperature, and increased emissions of volatile organic compounds (VOCs). Warm-mix technology can reduce energy consumption and emissions by lowering construction temperature, while odor-reduction technology can suppress the release of asphalt fumes and hazardous volatile substances at the source. This paper systematically reviews the domestic and international research status of CR/SBS composite modified asphalt, warm-mix technology, and asphalt odor-reduction technology, with emphasis on the performance enhancement mechanisms of multicomponent composite systems, VOC emission reduction pathways, and existing key issues. The prospects for the synergistic application of warm-mix additives and odor-reducing agents in CR/SBS composite modified systems are also discussed, with the aim of providing a reference for the development and engineering application of environmentally friendly, high-performance composite modified asphalt materials.

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