DESIGN OF IMPROVED LIME EXPANSIVE SOIL FOR EMBANKMENT OF FLEXIBLE PAVEMENT

The problem of the pavement structure on an expansive subgrade has to be found in some area which the reason the road surface will failure. Expansive soil experiences periodic swelling and shrinkage during the alternate wet and dry environments. The lime as the additive substance can reduce the swell potential and increase the bearing capacity of expansive soil was well known. In this study, the expansive natural soil and the improved lime soil have been used as landfill for subgrade of the pavement structure. Numerical modeling of flexible pavement constructed on expansive soil would apply for investigate settlement and strain to estimate failure which is always occurring. Based on FEM analysis using a computer program, the results show that the application for embankment with a height of 5m with the traffic load is considered a static load, resulting in a reduction in the potential damage where compressive strain occurs on the road surface under traffic load. The lime also reduced the total settlement.