ABSTRACT
In the state of practice, most state highway agencies (SHAs) perform the quality management of the unbound materials on the basis of adequate gradation, plasticity, and nature of coarse aggregates. Even though these parameters have been valuable in ensuring durability, they do not provide any indication of the stiffness of the material, the primary parameter used in the structural design of pavements. The acceptance of the compacted layer is based on adequate density and moisture content, regardless of whether the desired modulus is achieved. To implement modulusbased quality management of aggregate layers, the gap among the design process, and laboratory and field testing should be addressed.
