A STUDY OF COMPRESSIVE STRENGTH OF MOTAR MIXED WITH GROUND RICE HUK ASH

Abstract

This research aims to study the compressive strength development of motor mixed with ground rice husk ash.  There are two grindings: 2-hour grinding and 4-hour grinding. Cement was replaced by 25% and 50%. Mortars were cast by using w/b 0.65. The results showed that the 90-day mortar with 25% cement replacement with ground rice husk ash for 4 hours (M70RHA-4-25) showed the highest compressive strength, 298.88 ksc. On the other hand, the mortar, M50RHA-4-50, showed the lowest compressive strength, 257.06 ksc. In this study, it was also found that the replacement by 25% with 2-hour and 4-hour ground rice husk ash could be under the regulations of Pozzolana materials according to ASTM C 618 standard. However, the replacement by 50% with 2-hour and 4-hour ground rice husk ash could not be under the regulations of Pozzolana materials according to ASTM C 618 standard.