Quality assessment of recycled C&Ds' materials compacted using Continuous Compaction Control

Evaluation of bearing capacity is shifting towards enhanced Qc/Qa activities by means of non-destructive testing devices and/or roller integrated Continuous Compaction Control systems (CCC). The aim of this paper was to apply different types of compaction quality assessment criteria to C&D recycled materials compacted using an intelligent compactor equipped with CCC. Assessment criteria are based on the use of CCC measurements and/or independent spot-testing performed with deflectometric devices (Light Weight Deflectometer). Acceptance is based either on CCC results obtained over the compacted area and verified with direct LWD spot-tests, or, alternatively, on CCC proof-rolling measurements alone, for rapid quality control. A third criterion consists in calculation of a CCC target Stiffness Value worked out from a CCC-LWD correlation calibrated on a specific compacted section. Each criterion can be adopted as the single assessment to be performed; alternatively two or more options can be combined to increase acceptance reliability, depending on the importance of the construction or the variability of materials used.