Resilient Moduli of Reclaimed Asphalt Pavement Aggregate Subbase Blends: Fid-Bau Portal

Resilient Moduli of Reclaimed Asphalt Pavement Aggregate Subbase Blends

Bradshaw, Aaron S. / Costa, Jeffrey / Giampa, Joseph R.

This paper investigates the resilient moduli of reclaimed asphalt pavement (RAP) and virgin aggregate blends obtained from the subbase of a segment of Route 165 in Rhode Island, U.S. The materials included RAP and virgin aggregates that were blended off-site using cold recycled RAP, as well as RAP blends that were generated in situ from full-depth reclamation (FDR). Cyclic triaxial tests were performed on compacted specimens of the RAP blends to assess their resilient modulus ( $M_{R}$ ) behavior. Selected FDR RAP blends were mixed with various stabilizer treatments including liquid calcium chloride, asphalt emulsion, or portland cement. A three-parameter material model was fit to the laboratory test data and used to interpret the $M_{R}$ behavior. The $M_{R}$ values of the untreated cold recycled RAP blends and the untreated FDR RAP blends ranged from 120 to 502 MPa and 171 to 578 MPa, respectively. The $M_{R}$ values of the calcium chloride-treated and asphalt emulsion-treated FDR RAP blends were within the range of the untreated FDR RAP blends, but permanent strains were higher. The $M_{R}$ values of the portland cement-treated FDR RAP blends were significantly higher than the untreated FDR RAP blends and had lower permanent strains.