Evaluation and investigation of laboratory methods to determine the durability of pavement aggregates

Aggregates constitute the largest proportion of material in pavement projects, which includes concrete pavements or asphalt pavements (about 70 to 80 % by weight of concrete, and 90 to 95% by weight of asphalt mixes).Therefore, the quality of aggregates in the mixes is crucial for forming the behavior and the performance of pavement, and studies have shown it has the most influence on pavement properties. In addition, at present the most important issue for a pavement is its durability. Pavement durability is affected by various factors, such as type of aggregate, mix design method, environmental conditions and its implementation techniques. The use of aggregates of suitable quality and high durability can reduce most of the common pavement failures. Therefore, the durability and quality of aggregate materials should be tested before they are used in pavements. This paper reviews and investigates a variety of available experimental methods for determining the durability of aggregates. It also specifies the advantages and disadvantages of each of these methods. Finally, the most appropriate method is presented with regards to the limitations and availability of laboratory equipment in Iran.