Rheology of High Volume Sidoarjo Mud Mortar

Previous studies on Sidoarjo volcanic mud have been largely focusing on its use as lowvolume cement replacement pozzolanic material and not as a high-volume cement replacement material. This study is intended to study the behaviour of fresh mortar incorporating Sidoarjo volcanic mud as cement replacement in high-volume i.e. 50, 55 and 60 and compares the results with the ones of high-volume fly ash mortar. Calcination and grinding were applied as pretreatment for the mud to make it more reactive. Grinding time was varied into three different grinding time periods from two to eight hours, to vary the particle sizes of the calcined mud. The
results show that the finer the particle size of the Sidoarjo volcanic mud, the bigger the flow of the fresh mortar. The flow of fresh mortar containing the Sidoarjo mud is lower compared to those of
the ones with fly ash.