Evaluation of building materials recycling on HMA permanent deformation

Abstract

Reclaimed building materials (RBM) for recycling are examined on hot mix asphalt (HMA) permanent deformation performance. Four types of aggregates used for mixtures are: (a) 100% river crush stone (CS); (b) 100% RBM; (c) 50% coarse and fine RBM plus 50% coarse and fine CS (50% RBM plus 50% CS); and (d) coarse RBM plus fine CS (C-RBM plus F-CS). Two types of asphalt cement AC-10 and AC-20 are used as a binder for mixtures. The test results indicate 50% RBM plus 50% CS mixed with AC-10 or AC-20 has the lowest wheel path deformation at 25 °C, but the highest permanent deformation at 60 °C. Concerning the permanent deformation, 100% RBM and C-RBM plus F-CS mixed are better than 100% river crush stone mixtures. The analysis of variance of permanent deformation shows that the types of aggregate have a significant effect, no matter what test temperatures and binders are used. The asphalt cement either AC-10 or AC-20 does not significantly affect the permanent deformation performance.