Determination of Optimum Design Parameters for Semi Rigid Pavement

Preparation of the porous asphalt skeleton and cement grout for void filling are two major parts in the design of Semi Rigid Pavement. Finding the optimum mix ratios for cement grout and the level of compaction for asphalt mixtures were the objectives of this research. This paper mainly deliberates the design of experiments, data collection and analysis of semi rigid pavements mixtures. Workability test and compressive strength of cement grout and compressive strength, indirect tensile strength and qualitative measurements of semi rigid mixtures were considered in the designing of the semi rigid pavement mixtures. And also, to confirm the cement grout mixture composition, the penetration capability of cement grout and visual observations were studied. Optimum cement content, void filled with cement grout and the stability of the asphalt mixture for early age traffic were the other factors considered in the selection of the compaction level of the porous asphalt mixture. 20 blows in marshal compaction, 5% Silica fume, 0.39 water/cement ratio and 2ml/kg A & F type admixture were selected for the semi rigid mixture design.