Abstract

Strength and durability of road pavement depend on engineering properties of subgrade. However, soils used as subgrade may not satisfy the required quality. Expansive clayey soils can pose problems and cause pavement failure. A research about characteristic of soil stabilized with cement and rice husk ash was conducted to overcome these problems. This paper intends to compare bearing capacity of soft subgrade soil stabilized with cement and rice husk ash. The effectiveness of cement and rice husk ash in improving the engineering properties of soil can be directly compared since the sample of soil was collected from the same location and treated with the same treatment. By adding cement and rice husk ash, the bearing capacity of clayey soil increased significantly. For soil stabilized with cement, the soaked CBR was higher than that of the unsoaked. Opposite phenomenon occurred in soil stabilized with rice husk ash, as its bearing capacity reduced after soaking in the water. Therefore moisture change during design life of road pavement should be anticipated such as using appropriate drainage system.

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