Examination of Permanent Deformation Models for Use on a Recycled Concrete Aggregate, a Virgin Aggregate and a Blend of the Two

摘要

Utilization of crushed recycled concrete aggregate (RCA) in highway projects has become increasingly common due to many advantages both environmentally and economically. To understand its behavior more, a series of repeated load triaxial tests were conducted to assess the permanent deformation (PD) characteristics of RCA, a basaltic virgin aggregate (VA), and a blend of the two when used as an unbound layer in pavements. Tests were performed on samples at their optimum water contents and maximum dry densities. Factors influencing the PD of these materials are discussed. This study examines the applicability of several PD models on these materials. A model that that is simple, that incorporates the variation of PD with stress level and number of load cycles, that contains statistically significant parameters, and yet that fits the data well is identified. This model can be used by engineers to design roads using recycled materials more expediently, thereby aiding the profession's progress towards greener highways.