Document Type : Original Article
Authors
1
Construction Engineering and Utilities Department, Zagazig University, Zagazig
2
Construction Eng. and Utilities Dept., Faculty of Engineering, Zagazig University, Zagazig
3
Construction Eng. and Utilities Dept., Faculty of Engineering, Zagazig University, Zagazig, 44519, Egypt.
10.21608/jctae.2025.378642.1050
Abstract
Studies on sustainable asphalt mixtures in Egypt have not been investigated extensively, and currently, no standards for their industrial application have been provided. This study examined the performance of sustainable asphalt mixtures containing reclaimed asphalt pavement (RAP) in hot and warm conditions. To achieve the study objective, an experimental program was designed for the asphalt mixtures using five ratios (0, 20, 40, 60, and 80%) of RAP and four different petroleum wax contents (0, 4.0, 6.0, and 8.0%) by weight of asphalt cement. Petroleum wax was used as an organic additive for bitumen binder to produce warm asphalt. Performance characterizations of the asphalt mixtures include stiffness, cracking resistance, and compressive strength. These characteristics were evaluated by Marshall, indirect tensile, and unconfined compression tests, respectively. Results show that the increase in the replacement percentage of RAP causes a decrease in the stability, flexibility, and cracking resistance of hot asphalt mixtures. Using petroleum wax decreases the penetration, the rotational viscosity, and the mixing and compaction temperatures of modified asphalt cement. This reduction in mixing temperature saves fuel costs in asphalt mixture production. Adding petroleum wax decreases the stiffness and increases the flexibility, the modulus of elasticity, and cracking resistance more than in the corresponding hot case. Also, it indicated that using RAP in hot and warm asphalt mixtures improves properties and meets performance requirements.
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