THE EFFECT OF MICROWAVE INCINERATED RICE HUSK ASH ON THE STRENGTH OF FLOATING FOAMED MORTAR

This study is focusing on the effect of MIRHA in increasing the strength of floating foamed
mortar. Foamed concrete that has density lower than 1000kg/m3 would be floating in the water
but its compressive strength would be too low to be used in construction. So, the objective of this
research was to determine the optimum MIRHA percentage to be used to increase the
compressive strength of floating foamed mortar until it exceeded the minimum requirement of
compressive strength which is 3.45 Mpa. For each percentage ofMIRHA (0%, 5% and 20 %), 9
cube specimens with dimension of lOOxlOOxlOO mm are made for split tensile test which will be
tested for 28th days. The cube specimens are fairly distributed for tests at 3'd days, 7th days and
28th days. For the mix of MIRHA and other pozzolan material like silica fume and GOBS, 18
cubes of 55x55x55 mm are made for compressive strength test wihich will be tested for 28th
days. The specimens were subjected to wet curing for hydration process. The experimental
results show that mix containing MIRRA presented higher compressive strength and with the
exception of second mix that contains 5% of MIRHA, all other six has surpassed the minimum
requirement compressive strength. The sixth mix that contains 10% of MIRHA and 20% of slag
has achieved highest compressive strength which is 5.6 Mpa that exceeded required strength by
62%