ABSTRACT
This paper presents the results and analysis of permanent strain testing from Repeated Load Triaxial Testing (RLTT) conducted on three base products; two crushed concrete or Recycled Concrete Aggregate (RCA) materials and a local Virgin Aggregate (VA). The objective of testing was to study the impact of change in stresses on permanent deformation of the investigated materials using three different permanent strain testing protocols from Australian and New Zealand road authorities. A series of permanent strain tests were performed under drained conditions on cylindrical specimens, which had been statically compacted at different levels of moisture content. Duplicate specimens were tested at 60, 80 and 90% of Optimum Moisture Content (OMC) and a dry density ratio of 98% of Maximum Dry Density (MDD) from Modified Proctor compaction testing. On-sample measurements were made of sample deformation (refer Figure 1). Permanent strain was found to be
dependent on both moisture content and applied stress. In terms of accumulative permanent strain or the rate of permanent strain, it was found that the two RCA products performed better than the VA for the three permanent strain testing approaches. Some results are presented in Table 1.
