Analysis on improvement effect of high liquid limit clay

It is still a concerned issue to engineering industries that how to improve the high liquid limit clay as subgrade-filling. This article analyzed the three improvement methods about admixing lime, cement, and both cement and fly ash by field tests datum, and conducted CBR test. The results show that using the method of mixing cement and fly ash together to improve high liquid limit clay as subgrade-filling materials is a more economical and effective improvement method.