Stone column is among the method commonly used in ground improvement work. Simplicity on installation, cheapest cost and its effectiveness on ground improvement. However, the application of stone column also has limitation. According to previous studies, bulging failure is the major concern for stone column application. In this study, Pulverized Fly Ash (PFA) applied as additive material to solve the bulging problem of the stone column. A sample of PFA have been used taken from power plant Sultan Salahuddin Abdul Aziz Shah and considered as Class F PFA.

A senior lecturer at Universiti Malaysia Sabah. He has received his Ph.D from Universiti MARA Shah-Alam in the year 2018. His work mainly was in improving the performance of the stone column by replacing 50% of the granite rock with a mixer of Pulverised Fuel Ash (PFA) and sand. The new stone column has better engineering properties.