Abstract

The main objective of this research is to provide a solution to the rapid plastic deformation of flexible pavements due to moisture effect and heavy loading thus increasing the service life of flexible pavements. It is a common phenomena in Bangladesh that pavements undergo critical damage due to uncontrolled traffic flow, heavy loading and weather effect. Bangladesh has a subtropical monsoon climate characterized by wide seasonal variations in rainfall, high temperatures and humidity. Most parts of the country receives at least 2000mm of rainfall per year (weatheronline.co.uk)and the major parts of the country is comprised of sand and silty clay soil which tend to collapse when soaked and thus inducing damage to the sub-base layer of the pavements. The solution requires stabilization of sub-grade soil of flexible pavement using Portland Cement. The method considers three different percentage of cement content by weight (10%, 12% and 14%) with constant water-solid ratio(0.156) and finally recommends 10% cement content to be the optimum selection for stabilization.