The Performance Of Geopolymer Composite Containing Sodium Carbonate As An Alkaline Activator

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dc.contributor.authorTan, Leng Ee
dc.date.accessioned2018-01-18T07:16:23Z
dc.date.available2018-01-18T07:16:23Z
dc.date.issued2017-08
dc.description.abstractA review on the present body of knowledge in geopolymer concrete production reveals that very scarce amount of literatures have been established on the properties of geopolymer concrete produced with alkali metal carbonates as an alkali activator. Normally, geopolymer need to be cured under elevated temperature and activated by high concentration of strong alkali to achieve higher strength. The primary aim of the study is to establish the characteristic of geopolymer mortar produced with alkali metal carbonate and silicate cured under ambient temperature. The main alumina-silicate sources used was pulverised fuel ash (PFA) and ground granulated blastfurnace slag (GGBS). Besides, silica fume was added as an additive for strengthening the geopolymeric framework. The geopolymer mortar was assessed in terms of mechanical strength, durability properties and the microstructure development. The use of 8% of sodium carbonate and 10% of sodium silicate was found to be the combination which produces optimum strength performance for the test specimens fabricated. Though geopolymer mortar could achieve better strength than Portland cement mortar, however, the durability performance of geopolymer is marginally lower than cement mortar. Geopolymer mortar exhibited higher degree of porosity, air permeability and drying shrinkage than Portland cement mortar. In the aspect of chloride resistance and sulphate resistance, geopolymer has a better resistance than Portland cement mortar. Silica fume was used in low amount between 0-8% by weight of binder as pore filler. The use of 4% silica fume was established to promote the optimal strength, durability and self-healing performance. SEM and EDX analysis show that hydration product which is rich of calcium carbonate with dense structure was formed in combination with the geopolymeric framework. In conclusion, binder matrix comprising of geopolymer phase and calcium carbonate phase with adequate strength, durability and self-healing behaviour could be produced with sodium carbonate and sodium silicate as alkaline activators.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/5417
dc.language.isoenen_US
dc.publisherUniversiti Sains Malaysiaen_US
dc.subjectCharacteristic of geopolymer mortar produceden_US
dc.subjectwith alkali metal carbonate and silicate cured under ambient temperatureen_US
dc.titleThe Performance Of Geopolymer Composite Containing Sodium Carbonate As An Alkaline Activatoren_US
dc.typeThesisen_US
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