Vol. 28 No. 4 (2025) Cover Image
Vol. 28 No. 4 (2025)

Published: December 20, 2025

Pages: 524-530

Articles

Evaluation of the Strength and the Moisture Sensitivity of the HMA Mixture with RAP

Osamah H. Chafat 1 Basim H. Al-Humeidawi 2 Alaa H. Abed 1
1 Department of Civil Engineering, Collage of Engineering, Al-Nahrain University, Baghdad, Iraq
2 Roads and Transport Department, College of Engineering, University of Al-Qadisiya, Al-Diwaniyah province, Iraq.
History
  • Received: March 11, 2025
  • Revised: March 25, 2025
  • Accepted: April 13, 2025
  • Available Online: December 20, 2025
DOI

https://doi.org/10.29194/NJES.28040524

Abstract

Moisture-induced damage in asphalt pavements, is defined by adhesive failure at the binder-aggregate interface and decreased mechanical integrity, severely reduce pavement durability. The research examines the mechanical properties and moisture sensitivity of hot mix asphalt (HMA) enhanced with styrene-butadiene-styrene (SBS) polymer and including reclaimed asphalt pavement (RAP). Laboratory assessments, including indirect tensile strength (ITS) and tensile strength ratio (TSR) tests, were performed on conventional HMA, SBS-modified HMA (4% SBS), and SBS-modified HMA contained 20% RAP. The results indicated that SBS modification significantly improved mechanical and moisture resistance properties, where unconditioned ITS specimens increased by 37.1% and TSR value enhanced by 13.5%. The incorporation of RAP decreased ITS value by about 21 % relative to pure SBS-modified HMA; nevertheless, the SBS+RAP combination still show higher ITS and TSR values than conventional HMA.

Keywords

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