15. Supplementary Notes Project performed in cooperation with the Texas Department of Transportation and the Federal Highway Administration. 16. Abstract This report presents the results from an experimental program aimed at evaluating the use of the crushed concrete (CC) and recycled asphalt pavement (RAP) for use in mechanically stabilized earth (MSE) walls. Various properties of RAP and CC (strength, hydraulic conductivity, pull out resistance, creep potential, corrosivity) were investigated. CC was judged as an adequate backfill for MSE walls, although its marginal hydraulic conductivity requires additional drainage to be provided behind walls. RAP displayed a significant potential for deviatoric creep, making this material unsuitable as select backfill for MSE walls.