Abstract:
The demand for pavement construction aggregate is growing significantly. With a rise in aggregate
consumption, the use of recycled materials has become an attractive solution in pavement construction from
both economical and environmental perspectives. Use of recycled materials in the base course demands
understanding of their properties including its shear strength and recognition of potential problems that may
arise. The parallel gradation technique involves evaluating the parameters of a coarse material using a gradation
that is finer but parallel to the prototype. It has been successfully used for estimating the shear strength
parameters under certain conditions. The main objectives of this study are to: assess the applicability of the
parallel gradation technique to estimate the shear strength of Reclaimed Asphalt Pavement (RAP) and determine
the shear strength parameters of RAP in direct shear at two relative compactions.
