The Effect of Volumetric Replacement of Recycled Asphalt Aggregate on the Abrasion Resistance and Chloride Ion Penetration of RCCP Using the RCMT Method

Document Type : Research Paper

Authors

1 M.Sc. in Civil Engineering (Construction Engineering and Management), Faculty of Civil Engineering, Sharif University of Technology (Kish Campus), Kish, Iran

2 Maliabad Street

3 Master's Degree, Department of Civil Engineering, Shi.C.,Islamic Azad University, Shiraz, Iran

10.22124/jcr.2026.31160.1712

Abstract

For many years, the construction of asphalt roads has been common in Iran, and today a significant volume of asphalt waste resulting from the aging and destruction of these roads is accumulating. These wastes are often transported to the outskirts of cities, and there is no specific mechanism in the industry for their recycling. Continuation of this trend, in addition to increasing construction costs, leads to the depletion of natural resources and quarries. In line with this goal, in the present study, various volumetric percentages of recycled asphalt aggregate (including 10, 20, 30, 40, and 50%) were used as a replacement for natural coarse aggregate in the production of RCCP. Other construction requirements were also applied according to National Standard No. 14830. Additionally, in order to enhance the compaction and quality of the concrete, microsilica equal to 10% by the cement weight was incorporated. The experiments conducted in this study included measurements of specific gravity, slump, abrasion resistance, and durability evaluation against chloride ion penetration using the RCMT method. The results indicated that as the replacement percentage of recycled asphalt increased, the abrasion resistance of RCCP decreased. However, RCCP containing 10% recycled asphalt still remained within the acceptable range of the code for light-duty and low-traffic pavements. Furthermore, the chloride ion penetration rate (by the RCMT method) in samples containing 10% and 20% recycled asphalt aggregate was within the permissible limits for XCD2,3 environmental conditions.

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Main Subjects

References

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