Correlating Continuous Compaction Control Measurements to In Situ Modulus-Based Testing for Quality Assessment of Compacted Geomaterials

Intelligent compaction (IC) allows real-time monitoring of earthwork from vibration-based measurements of the drum in contact with the ground. IC technology can be employed for the quality management of compacted geomaterials with the purpose of constructing better quality and longer-lasting pavements, when used in conjunction with in situ modulus-based nondestructive spot test devices. Different studies have attempted with limited success to relate roller measurement values with in situ moduli or stiffness values. This study presents a geostatistical approach using a fixed interval analysis to establish a spatial correlation between IC measurement values within defined sublots and spot test measurements using a plate load test or a lightweight deflectometer. Closely spaced spot test measurements show the variability of the material properties of compacted geomaterials. The spot test measurements do correlate better to the roller measurement values when the inevitable variability in the compacted geomaterial is considered.