Effects of re-vibration on mechanical properties and air-void characteristics of cement-stabilised macadam materials

Abstract

ABSTRACT Layered continuous paving (LCP) technology is an effective choice for improving the integrity and construction efficiency of the thick cement-stabilised macadam (CSM) base course. However, the effects of re-vibration generated by construction equipment during the paving process are not well understood. In this investigation, the effects of re-vibration on mechanical properties and air-void characteristics were investigated by mechanical performance tests, chloride migration experiments and industrial computerised tomography tests. The results demonstrate that compared with the control group, the void characteristic parameters were reduced by applying re-vibration within 12 h, resulting in a more compact structure. Thus, the mechanical properties were improved. However, the improvement effect gradually weakened over the delay time. CSM interlayer bonding strength were related to the time point of applying re-vibration and the cement paste dosage sprinkled between the layers. It is suggested that12 h be used as the critical time point for the LCP.