Durability of lightweight asphalt concrete

Abstract: This paper investigates the durability of lightweight asphalt concrete (LWAC) utilizing locally sourced lightweight aggregates, specifically perlite and pumice, to advance sustainable pavement engineering practices. With asphalt pavements accounting for approximately 95% of Turkey's roadway network, the optimization of their performance through innovative and eco-friendly materials is critically important. Lightweight aggregates offer potential benefits, such as lower density and reduced transportation costs, which can lessen environmental impacts due to local sourcing. However, their inherent characteristics, including high porosity and low density, may raise concerns regarding the structural integrity and long-term performance of asphalt mixtures.

To comprehensively assess the durability of LWAC, this study employs rigorous testing methodologies, including volumetric analysis, dynamic modulus testing, and long-term performance evaluations under simulated environmental conditions. The research focuses on various formulations of asphalt concrete, examining the effects of blending lightweight aggregates with traditional limestone to enhance stability and resistance to environmental stresses such as temperature fluctuations and traffic loads.

The results of this investigation aim to provide empirical data on the performance characteristics of LWAC, enabling a clearer understanding of its potential applications and limitations in roadway construction. By identifying effective practices for incorporating lightweight aggregates, this research contributes to the broader field of sustainable construction, offering insights that can help improve the durability and lifecycle performance of asphalt pavements, benefiting infrastructure development in Turkey and similar regions worldwide.