Evaluation of an Asphalt Mixture Containing a High Content of Reclaimed Asphalt Pavement (RAP) Materials with Epoxy Asphalt-Reference-Cited by-同舟云学术

Evaluation of an Asphalt Mixture Containing a High Content of Reclaimed Asphalt Pavement (RAP) Materials with Epoxy Asphalt

Published:2024-06-11 Issue:12 Volume:16 Page:4988
ISSN:2071-1050
Container-title:Sustainability
language:en
Short-container-title:Sustainability

Author:

Elnihum Ahmed¹^ORCID,Lu Qing¹^ORCID,Alharthai Mohammad²^ORCID,Alamri Mohammed³^ORCID,Chen Can⁴^ORCID,Elmagarhe Asad¹^ORCID

Affiliation:

1. Department of Civil and Environmental Engineering, University of South Florida, Tampa, FL 33620, USA

2. Department of Civil Engineering, Najran University, Najran 66446, Saudi Arabia

3. Department of Civil Engineering, King Saud University, Riyadh 11421, Saudi Arabia

4. ChemCo Systems, 2800 Bay Rd., Redwood City, CA 94063, USA

Abstract

The average content of reclaimed asphalt pavement (RAP) materials in asphalt mixtures for new pavements is around 22% in the current paving practices in the United States. Increasing this content has significant economic and environmental benefits. This study explored the approach of producing asphalt mixtures with 100% RAP materials by adding a small percentage of epoxy asphalt. Specimens of 100% RAP mixtures with low contents of epoxy asphalt were fabricated and evaluated in the laboratory for their properties related to pavement performance, including Marshall stability and flow, indirect tensile strength, resistance to moisture damage, resistance to fatigue damage, and fracture resistance. The results showed that the specimens made of 100% RAP materials selected in this study without a new binder or rejuvenator had low workability and high Marshall stability and indirect tensile strength but poor resistance to moisture damage and fatigue damage. A low percentage (0.5 to 2%) of epoxy asphalt significantly improved the resistance to moisture and fatigue damage of the 100% RAP mixture, and this improvement increased with the epoxy asphalt content. The fracture resistance of the 100% RAP mixture was also significantly improved by a low dosage of epoxy asphalt at a low temperature (8 °C), but the improvement was less significant at a moderate temperature of 25 °C.

Funder

U.S. Department of Transportation

Publisher

MDPI AG

Link

https://www.mdpi.com/2071-1050/16/12/4988/pdf

Reference46 articles.

1. FHWA (2023, June 16). Highway Statistics 2020. Policy and Governmental Affairs, Office of Highway Policy Information, Available online: https://www.fhwa.dot.gov/policyinformation/statistics/2020/.

2. Williams, B.A., Willis, J.R., and Shacat, J. (2022). Asphalt Pavement Industry Survey on Recycled Materials and Warm-Mix Asphalt Usage: 2021, National Asphalt Pavement Association. [12th ed.].

3. Improving fatigue and low temperature performance of 100% RAP mixtures using a soybean-derived rejuvenator;Elkashef;Constr. Build. Mater.,2017

4. Synergistic effect of SBS copolymers and aromatic oil on the characteristics of asphalt binders and mixtures containing reclaimed asphalt pavement;Eltwati;Constr. Build. Mater.,2022

5. Tarsi, G., Tataranni, P., and Sangiorgi, C. (2020). The challenges of using reclaimed asphalt pavement for new asphalt mixtures: A review. Materials, 13.