Recently, a great deal attention is being has attached the problem of durability of strength and impermeability of grouted sand. However, the durability has yet to be fully clarified. This paper examines the prediction methods of the long-term strength of grouted sand concerning the durability. As a result, we were able to obtain two estimation methds. One is the xtrapolation method, other is the Arrehenius Plot method of the same shape. It is possible to estimate the long-term strength of grouted sand by these methods.
