Redesign of Rigid Pavement Based on Subgrade Bearing Capacity Evaluation

Abstract

The Rancacili Road in the Rancasari District of Bandung City frequently suffers from damage due to its strategic importance. To address this issue, this study aims to redesign the pavement by replacing the subgrade soil composition and upgrading the surface layer with rigid pavement. The research objectives include assessing the subgrade bearing capacity, analyzing the impact of subgrade stabilization, and evaluating the causes of road damage. The methodology involves field and laboratory tests. Field tests include Dynamic Cone Penetrometer (DCP) tests and traffic data observations. Laboratory tests encompass physical and mechanical soil tests. Soil samples were collected from the field, and various mixtures of soil, concrete sand, and cement were used. Stabilization tests were conducted with mixtures containing 75% soil and varying percentages of sand and cement. The results indicate that the variation 5 mixture, consisting of 75% soil and 25% cement, significantly enhances the subgrade bearing capacity, increasing from an existing value of 4.186 to 8.18. In addition to soil stabilization using cement, the redesign includes implementing rigid pavement. Using AASHTO 1993 methods, the recommended concrete thickness is 274 mm. This redesign aims to improve the durability and performance of the Rancacili Road.