Modified cement system :durability and aesthetic
Efflorescence is a type of discoloration. It is a deposit salt, usually white in color that occasionally develops on the surface of concrete. Although unattractive, efflorescence is usually harmless to the structure such as concrete bridge. In rare cases excessive efflorescence, within the pores...
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| Format: | Final Year Project Report |
| Language: | English English |
| Published: |
Universiti Malaysia Sarawak (UNIMAS)
2009
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| Online Access: | http://ir.unimas.my/id/eprint/7495/1/Zarini%20%20%2824%20pages%29.pdf http://ir.unimas.my/id/eprint/7495/4/Zarini%20%28fulltext%29.pdf http://ir.unimas.my/id/eprint/7495/ |
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| Summary: | Efflorescence is a type of discoloration. It is a deposit salt, usually white in color that
occasionally develops on the surface of concrete. Although unattractive, efflorescence is
usually harmless to the structure such as concrete bridge. In rare cases excessive
efflorescence, within the pores of the material, can cause expansion that may disrupt the
surface. Efflorescence is caused when soluble salts and other water dispersible materials
come to the surface of concrete and mortars. It is induced by low temperatures, moist
conditions, condensation, rain, and water added to the surface of concrete. The modified
cement system can reduce the efflorescence but cannot avoid it because of the reaction of
cement hydration itself. This study proved that by using the modified cement system such as
Pulverized Fly Ash (PFA) and Polymers (water based latex grade 29Y46), the efflorescence
can be reduced. The mix proportion with and without PFA and Polymers are tested with
various properties such as strength test, water absorption and efflorescence in order to
understand the effect against the performance of the mortar. The results from this study
showed that the modified mortar which is the sample with PFA and Polymers has higher
strength, durability, and less efflorescence compared with non-modified cement system. |
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