This dissertation study was conducted to evaluate the use of recycled concrete aggregates as flexible base as per the requirements of the Texas Department of Transportation (2004). Two sources of recycled aggregates and one source of natural limestone aggregate were collected from the Dallas/Fort Worth Area and used in the present study. The selected materials were evaluated in laboratory conditions, modeled in the use as base materials for flexible and rigid pavement structure , and compared in cost for their use in construction. (Kode: UMI Number: 3369309) Rak Penelitian 2