Asphalt for Road Infrastructure: A Review of Composition, Modification, and Sustainability

Abstract

A key component of asphalt road pavement is well known for its strength and adaptability. The basic ingredients of asphalt, such as aggregates and binder, are examined in this overview along with how they interact to greatly affect pavement performance. A systematic literature review was undertaken using peer-reviewed journals, technical reports, and industry publications, focusing on advancements in asphalt materials and sustainable pavement technologies from the past two decades. The study investigates asphalt classifications according to aggregate structure, manufacturing temperature, and the use of additives or modifications to enhance performance under various traffic and environmental conditions. Advanced modifications, such as the incorporation of polymers, crumb rubber, and recycled asphalt pavement, are explored for their ability to enhance rheological properties while addressing sustainability concerns. The review also highlights innovative production techniques, which reduce energy consumption and emissions, making it a more sustainable alternative to conventional methods. Furthermore, factors influencing asphalt selection, such as climate adaptability, load-bearing capacity, fatigue resistance, and maintenance requirements, are analyzed to provide a comprehensive understanding of material behavior in real-world applications. The importance of proper mix design, compaction techniques, and quality control measures is emphasized to ensure optimal pavement longevity and performance. By integrating advanced material science and engineering practices, modern asphalt technologies aim to enhance road durability, reduce lifecycle costs, and minimize environmental footprint. This review underscores the critical role of material composition, innovative additives, and sustainable production techniques in optimizing asphalt performance for future road infrastructure developments.