Laboratory Characteristics, Performance Evaluation, and Agency Cost Analysis of Cold-Recycled Asphalt Mixtures

Marwa B. Elaskary, Graduate student, Public Works Engineering Department, Faculty of Engineering, Mansoura University, EgyptFollow
Ahmed M. Awed, Public Works Engineering Department, Faculty of Engineering, Mansoura University, Egypt
Alaa R. Gabr, Public Works Engineering Department, Faculty of Engineering, Mansoura University, Egypt
Sherif M. El-Badawy, Professor, Public Works Engineering Department, Faculty of Engineering, Mansoura University, Egypt

Subject Area

Civil and Environmental Engineering

Article Type

Original Study

Abstract

This technical study offers a comprehensive investigation into the utilization of Cold Recycled Asphalt Mixtures (CRAMs) with varying proportions of Reclaimed Asphalt Pavement (RAP) in the context of pavement maintenance applications. The study encompasses a multi-faceted analysis, encompassing laboratory mix design requirements, mix performance evaluations, and a thorough assessment of economic benefits, with the overarching goal of promoting the sustainable adoption of CRAMs in pavement maintenance. To achieve the objectives of the research, five ratios of RAP to virgin aggregates (VA) of (0%:100%), (25%:75%), (50%:50%), (75%:25%), and (100%: 0%). The research encompasses a wide array of laboratory tests and investigations (including the modified Proctor and Marshall methods), revealing that CRAMs can be successfully designed to meet critical mix design properties and volumetric requirements. While some compromises in moisture resistance, in terms of loss of stability (LS) and tensile strength ratio (TSR), and fatigue resistance, in terms of indirect tensile strength (ITS), were observed with increased RAP content, CRAMs demonstrated superior viscoelastic performance, in terms of dynamic modulus (E*), and a remarkable resistance to permanent deformation, in terms of flow number (FN), especially when containing a high proportion of RAP (50-75%). Most notably, the study underscores the substantial sustainability advantages associated with the incorporation of RAP in CRAMs, including cost reductions ranging from 19.1% to 51.7% in comparison to conventional dense-graded cold mix asphalt (CMA). This research not only advances the technical feasibility of CRAMs with RAP but also provides compelling economic incentives, making it a pivotal contribution to the field of sustainable pavement rehabilitation, particularly in regions abundant in RAP resources such as Egypt.

Keywords

Cold-recycled asphalt mixtures; Recycled asphalt pavement; Loss of stability, Indirect tensile strength; Moisture susceptibility; Dynamic modulus; Flow number; Agency Cost Analysis

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 License.

Recommended Citation

Elaskary, Marwa B.; Awed, Ahmed M.; Gabr, Alaa R.; and El-Badawy, Sherif M. (2024) "Laboratory Characteristics, Performance Evaluation, and Agency Cost Analysis of Cold-Recycled Asphalt Mixtures," Mansoura Engineering Journal: Vol. 49 : Iss. 2 , Article 17.
Available at: https://doi.org/10.58491/2735-4202.3189

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