REA Press Null REA Press3042-02023042-0202 REA Press https://doi.org/10.48314/ijrceai.v2i1.32 Research Article Waste concrete aggregates, Styrene butadiene rubber polymer, Fatigue life, Dynamic creep. An Investigation Was Conducted into the Effect of Using Modified Waste Concrete Aggregates on the Volumetric and Mechanical Properties of Hot Asphalt Mixtures and Asphalt QualityAn Investigation Was Conducted into the Effect of Using Modified Waste Concrete Aggregates on the Volumetric and Mechanical Properties of Hot Asphalt Mixtures and Asphalt Quality Alijani Mehrdad Department of Civil Engineering, Ayandehgan University, Tonekabon, Iran. 01 2025 16 01 2025 2 1 © 2025 REA Press 2025

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 An Investigation Was Conducted into the Effect of Using Modified Waste Concrete Aggregates on the Volumetric and Mechanical Properties of Hot Asphalt Mixtures and Asphalt Quality

Compared to Natural Aggregates (NAs), waste concrete aggregates exhibit weaker mechanical and physical properties due to their weakly bonded, highly porous cement mortar. Therefore, their use in asphalt mixtures reduces their resistance to various types of damage. Therefore, in this study, to reduce permeability and increase the strength of bonded cement mortar, waste concrete aggregates were modified by two methods: chemical (coating their surfaces with a styrene butadiene rubber polymer) and physical (separation of cement mortar using heating), and used in asphalt mixtures. The findings showed that adding coarse aggregates from unmodified waste concrete up to 50% reduces the flow number and rutting resistance in asphalt mixtures. Also, using unmodified waste concrete aggregates as part of the coarse aggregate at 25% and 50% reduces the fatigue life of asphalt mixtures.

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