Utilization of inferior quality aggregates in asphalt mixes: A systematic review

Abstract

Properties of aggregates are majorly influenced by parameters of source rocks viz., formation process, chemical composition, impurities, volume of pores, and grain size. The study presents a review of aggregate treatment methods and its efficacy to enhance the quality of aggregate. Various aspects of aggregate treatment methods like processing temperature, the dosage of additives, adaptability in the field is studied for three treatment methods viz., polymer coating, cementitious coating, and chemical treatments. The paper also presents an insight to understand the effect of different treatment methods on mix properties and performance parameters of asphalt mixes. The review revealed that the shape properties of aggregates can be enhanced by the incorporating suitable crushing process (two-stage or three-stage). Whereas, physical and durability properties of aggregates can be improved by various treatment methods like polymer coating, Zycosoil treatment. It was further inferred from the review that treatment methods can have moderate effects on the mechanical properties of aggregates, since, it is mostly dependent on properties of source rocks. • Various inferiorities in aggregates properties are discussed. • A review of different treatment measures to improve the properties of inferior quality aggregate is presented. • Effect of various treatment methods on the properties of asphalt mixes is reviewed. • Future research directions for treating inferior quality aggregate to be used in asphalt mixes are discussed.