Abstract
Resilient modulus (Mr) is a representative property for characterizing unbound granular materials and subgrade soils. It exhibits the elastic behavior as well as the load-bearing ability of pavement materials under cyclic traffic loads. This paper investigates the influence of using recycled plastic Polyethylene Terephthalate (PET) as a soil reinforcement material on the Mr of a clayey soil; ordinary soil in the delta region in Egypt. A comprehensive laboratory testing was conducted at Mansoura University Highway and Airport Engineering Laboratory (H&AE-LAB). The conducted testing includes standard engineering tests and repeated-loading triaxial tests (RLTT). Laboratory specimens were prepared at four different percentages of the recycled PET (0%, 0.2%, 0.6%, and 1.0%). RLTT results shows that the Mr of 0.6% PET-reinforced specimens increases by 58% compared to the Mr of the control specimen (0% PET). However, the Mr of the reinforced soil is found to decrease with the increase of PET percentage. Moreover, the universal Mr model exhibits excellent Mr predictions for the control and the PET-reinforced clay soil. Economically, the initial cost for constructing a 10-km road segment decreases by 8% using the 0.6% PET-reinforced Subgrade compared to the control Subgrade. Finally, damage analysis using the KENLAYER software is used to manifest the enhancement of pavement performance by reinforcing the Subgrade with PET.
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Hafez, M., Mousa, R., Awed, A., El-Badawy, S. (2019). Soil Reinforcement Using Recycled Plastic Waste for Sustainable Pavements. In: El-Badawy, S., Valentin, J. (eds) Sustainable Solutions for Railways and Transportation Engineering. GeoMEast 2018. Sustainable Civil Infrastructures. Springer, Cham. https://doi.org/10.1007/978-3-030-01911-2_2
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