THIN ASPHALT AND DOUBLE SEAL REHABILITATED LIGHTLY CEMENTED PAVEMENTS: EVALUATION OF STRUCTURAL BEHAVIOUR AND LIFE CYCLE COSTS

A multi-year Accelerated Pavement Testing research programme was initiated to study the behaviour of rehabilitated Lightly Cemented Pavement (LCP) structures. The aim of this work was to quantify the structural behaviour of these rehabilitated pavements, and to optimise the life-cycle cost for the road agency. The main findings were that the rehabilitated LCPs tested in the study only failed in terms of permanent deformation due to pumping of fines in the wet condition [G1 crushed stone and thin (< 50 mm) asphalt rehabilitation options] and bleeding of the double seal (double seal rehabilitation option). The economic analysis of these rehabilitated LCPs, indicated that the double seal rehabilitation option is the most economical option for traffic classes with equivalent traffic demands less than or equal to 10 million equivalent standard axles, while the G1 crushed stone rehabilitation option was the most economical option for 10 to 30 million equivalent standard axles.