PARAMETRIC STUDY OF WATER RATIO ON COMPRESSIVE STRENGTH OF MIRHA MORTAR

In this feasibility study, experimental works with varied water ratio on varied
Microwave Incinerator Rice Husk Ash (MIRHA) content as partial cement
replacement were investigated. Binder sand ratio of 1 :3 and 1 :4, and replacement of
MIRRA content: 5%, 10%, 15%,20%,25%,30%,35%, 40% and 45% were studied.
Only two water ratios of 0.5 and 0.55 were used respectively. Several tests were
conducted namely compressive strength at 7, 28, and 60 days, water absorption,
Intial Rate of Suction (IRS). The compressive strength ranged from 10 MPa to 45
MPa from 7 to 60 days. In general, water absorption and IRS were found to be
proportionally inversed with the strength. Highest compressive strength was obtained
from binder sand ratio of 1 :3 at water ratio of 0.5 for 15% MIRRA replacement at 60
days. Whilst, lowest compressive strength of 12MPa was obtained from binder sand
ratio of 1:4 at water ratio of 0.55 for 45% MIRRA replacement at 60 days.