Development of rice husk ash-based geopolymer binder for fire resistant coating
Despite the growing popularity of geopolymer in various industrial applications, the literature showed gaps on understanding of factors influential on the properties of geopolymer binder (GB). The main objective of this research is to develop an eco-friendly rice husk ash (RHA)-based GB material...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English |
| Published: |
2016
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/67059/1/FK%202016%20169%20%20IR.pdf |
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| Summary: | Despite the growing popularity of geopolymer in various industrial applications,
the literature showed gaps on understanding of factors influential on the
properties of geopolymer binder (GB). The main objective of this research is to
develop an eco-friendly rice husk ash (RHA)-based GB material suitable as fire
resistant coating and panel materials for building construction. Four experiments
were conducted; namely fire resistant, compression, flexural, and adhesion
tests. Fractional factorial design (FrFD) and response surface methodology
(RSM) were used to design the experiments incorporating five factors; namely
ratio of activated alkaline (AA) solution, RHA to AA (RHA/AA) ratio, curing
temperature, curing time, and sodium hydroxide concentration and analyze their
interrelationship and effect on GB properties. The optimum range for GB
composition was accordingly determined using superimposed contour plotting.
Results showed that RHA/AA ratio was the most influential factor on all GB
properties (thermal, mechanical, and physical properties). RHA provided
effective fire resistant properties since its GB coating exhibited intumescent-like
expansion. The newly developed formulation of GB which exhibited semi-brittle
behavior was able to produce good fire resistance and compressive strength
properties. In addition, good adhesion and flexural properties were important in
providing coating with good fire resistant properties. Optimal GB panels were
formulated at W/S and Si/Al ratios of 1.05 to 1.13 and 95 to 110, respectively
while optimal GB coating formulated at W/S and Si/Al ratios of 110 to 130 and
1.20 to 1.33, respectively. RHA proved to be the best alternative aluminosilicate
source and the RHA-based GB, when used as panel or coating materials, can
potentially improve fire safety in building construction. |
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