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Geopolymer material is formed through the reaction of silica and alumina oxides with alkali activator and has appeared as a viable alternative to the Ordinary Portland Cement (OPC) in the construction field due to good properties such as more resistance to corrosion and fire, high compressive and tensile strength, low permeability and good acid resistance. Furthermore, the production of geopolymer concrete offers a solution to the environmental issue as it utilized the industrial waste that consist of Si and Al such as fly ash and wastewater from chemical industry. However, there are limited research were conducted to investigate the effect of parameters before setting time especially at the solidification phase in geopolymerization process and explained it through Avrami‟s Kinetic Theory‟s perspective that closely related to the nucleation of new particles and growth rate of particles into spherical shaped. This research is to study the solidification of fly ash geopolymer by determining setting time by varying curing temperature, alkaline activator and concentrations of alkaline. However, prior to the study of the effects, the feasibility of equipment used between LFRA Texture Analyzer and Vicat Needle was determined. Further characterization on the phase exists during the solidification process of geopolymer was done using XRD analysis. Besides that, this research also focuses on the transformation of crystal in geopolymerization through Avrami‟s Kinetic Theory. From the experimental results, the alkaline activation with the addition of sodium silicate (Na2O3Si) to sodium hydroxide (NaOH) produced shortest time for solidification geopolymer followed by potassium hydroxide (KOH) solution and sodium hydroxide (NaOH) solution. Moreover, the increase in concentration of alkaline solution and curing temperature produce shorter setting time for geopolymer‟s solidification. From the Avrami Kinetic Theory‟s perspective, the growth form of crystal in the geopolymerization process exhibits two and three dimensional structure while certain samples of geopolymer shows there are presence of secondary nucleation in geopolymer‟s growth.

Item Type: Final Year Project
Academic Subject : Academic Department - Chemical Engineering - Reactor Technology
Subject: T Technology > TP Chemical technology
Divisions: Engineering > Chemical
Depositing User: Users 2053 not found.
Date Deposited: 09 Oct 2013 11:07
Last Modified: 09 Oct 2013 11:07
URI: http://utpedia.utp.edu.my/id/eprint/8432

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