The seismic performance of mud walls is decided by the mechanical characteristics of wall clay. Viscous soil is mixed with sand and fiber material such as straw for wall clay based on the experience and intuition of craftsmen. In this study, the objective is to examine experimentally the effect of the mix proportion on the mechanical characteristics of wall clay, such as cohesion and angle of internal friction. It is shown that the mechanical characteristics of wall clay can be changed by the mix proportion of sand or bentonite to wall clay.
