The influence of rice husk asp artial replacement material in fired-clay brick
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Date
2010
Authors
Johari, izwan
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Journal ISSN
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Abstract
The depletion of clay as a natural resource for making fired-clay bricks is in contrast
with the high demand from the construction industry. This situation has obliged the
researcher to introduce new construction materials using agricultural waste or to provide
an alternative method to the manufacturing of traditional building material such as firedclay
brick, particularly during the current economic crisis. This thesis reports the effect
on the usage of three types of rice husks as partial replacement material for clay in firedclay
brick. The investigation includes the manufacturing process, firing process, physical
and mechanical testing and also the performance of fired-clay brick as masonry wall.
Three types of fired-clay bricks with five different mix proportions (5-30%), including
one type of control brick (0% ), were produced using an extruder machine. In
determining the optimum firing temperature, the control bricks were fired inside a
muffle furnace with different temperatures ranging from 800-1250°C. The optimum
firing temperature was verified based on the controlled brick compressive strength result
and used as the optimum firing temperature for the production of fired-clay bricks.
Selected fired-clay bricks were used for the construction of a small scale masonry wall
using mortar with a designation of 1 : Yz : 4Yz. Based on the results obtained from
controlled fired-clay brick (0%), the optimum firing temperature was found to be 1200°C
with compressive strength of 89.52 N/mm2
, water absorption of 6.6%, initial rate of
suction of 0.34 kg/m2.min and porosity of 14.2%. Fired-clay brick with 20%
replacement of CBRHA increase in strength, water absorption and porosity to 93.45
N/mm2
, 11.3% and 21.2%, respectively. The initial rate of suction reduce to 0.0872
kg/m2.min. Fired-clay brick with 5% replacement ofUCBRHA reduce in strength, water
absorption, porosity and initial rate of suction to 83.51 N/mm2, 6.2% and 13.0%, 0.1509
kg/m2.min, respectively. Fired-clay brick with 5% replacement of GRH reduce in
strength and initial rate of suction to 51.35 N/mm2 and 0.3026 kg/m2.min, repectively.
The water absorption increase to 7.3% and porosity remain the same at 14.2%.
Controlled burning rice husk ash (CBRHA) is the best material to be used as
replacement material in the production of fired-clay bricks compared to uncontrolled
burning rice husk ash (UCBRHA) and ground rice husk (GRH).
Description
Keywords
Partial replacement , Rice hush