Consensus and source properties of Malaysian aggregates for superior performing asphalt pavements / Hjh. Juraidah Ahmad, Prof. Madya Ir. Dr. Mohd Yusof Abdul Rahman and Prof. Madya Ir. Dr. Zainab Mohamed

Aggregates and asphalt binder are the two main constituents that determined the performance of hot mix asphalt (HMA). Since a wide variety of mineral aggregate is used to produce Hot Mix Asphalt (HMA), proper evaluation of the mineral aggregate properties is important to ensure good performance of asphalt mixture. Unlike Superpave system, Marshall and Hveem method do not incorporate aggregate criteria into their procedures. The SHRP Asphalt Research Program modified the Delphi process to include aggregate properties which is divided into two categories; consensus and source. The consensus properties include aggregate angularity, flat and elongated particles and sand equivalent to ensure aggregate quality is sufficient to provide satisfactory HMA performance for all design traffic levels. The source properties are often used to qualify local source of aggregate which include abrasion, deleterious materials and soundness test. In this study, aggregates collected from northern, central and southern region of Peninsular Malaysia. The performance of all aggregates from different source conforms to the criteria set by the Superpave system. Malaysian aggregates show high performance and quality for use in construction of highways especially so, in terms of resistant to abrasion and disintegration. However, aggregates from Kuad Quarry do not meet the requirement of the flakiness index which is slightly above the maximum set criteria. Otherwise most of the aggregates are durable, strong and satisfies both the consensus and source properties testing.