The Effects Of Partial Replacement Of Cement In
Cement Mortar And Brick By Microwave
Incinerated Rice Husk Ash (MIRHA)
Author(s)
S. Wan, K. Vallyutham, M. S. Liew & N. S. Potty
Abstract
The demand for high quality sustainable materials has increased and encouraged
the researchers in building technology to find new alternatives. Rice husk
generated from the rice production poses a major problem of disposal especially
when open burning is no longer permitted due to the environmental issues. The
use of pozzolanic materials is being investigated to reduce the carbon dioxide
emitted per tonne of concrete produced and utilized. This study investigates the
potential of using Microwave Incinerated Rice Husk Ash (MIRHA) in mortar
mixes made of Ordinary Portland Cement (OPC). The MIRHA was obtained by
burning rice husk at controlled temperature using microwave incinerator. In the
experimental study on compressive strength of cement mortar the water-binder
ratio was kept constant at 0.5. Control mortar without any replacement of cement
and also mortar with 5%, 10%, 15%, 20% and 25% of OPC replaced by MIRHA
were studied with different binder-sand ratio of 1:3, 1:4. 1:5 and 1:6. The
compressive tests were conducted for the samples at 7 and 28 days. The result
has revealed that, the MIRHA could be used in cement mortar due to its refined
microstructures. In addition to that, the compressive test results were compared
with three different standards: ASTM, MS and BS for bricks manufacturing. The
results show the potential of using MIRHA in cement brick production. Amongst
the cement replacement mixes, 20% MIRHA has shown highest compressive
strength.
Keywords: Microwave Incinerated Rice Husk Ash, mortar, brick, cement
replacement material.
Keywords
Microwave Incinerated Rice Husk Ash, mortar, brick, cement
replacement material
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