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Characterization of Nano-Silica Local Metakaolin Based-Geopolymer: Microstructure and Mechanical Properties

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Document pages: 19 pages

Abstract: The current study focused on the utilization of local clay for synthesisand characterization of meta-kaolin based geopolymers with and withoutnano-silica. The control geopolymers, for a compressive strength of 30 MPa,were optimized by using Liquid Solid ratio of 0.55, NaOH concentration of 10 Mand curing at 80°C. The nano silica was added in an extended range of 1 , 2 ,3 , 5 , 7 and 10 . The synthesized nano-silica metakaolin based geopolymers was investigated by using compressive strength, XRD, XRF, FTIR, SEM, MIP, TG,UV VIS spectroscopy, in addition to density, water absorption and initialsetting times. The results indicated an increase in the compressive strengthvalue with the incorporation of nano-silica in geopolymer mixes until theoptimum percentage of 5 , while the 10 addition of nano-silica decreased thecompressive strength by 5 as compared to the control geopolymer. The increasein the compressive strength was accredited to the increase in the content ofN-A-S-H gel and the amorphous structure as shown by XRD and FTIR analysis. Inaddition, the optical transmittance analysis, MIP and SEM scans along with the resultsof density and water absorption have clearly shown the densification of thematrix formed for the optimal percentage of nano-silica. However, the initialsetting time was found to reduce substantially with increase of nano-silicacontent. Moreover, the TG results have shown the 5 nano-added geopolymers tohave greater thermal stability as compared to reference geopolymers.Finally, the adopted methodology in this research has shown that 5 nano-silica, is the optimal result for the synthesis and the production oflocal meta kaolin based geopolymer, with regard to the improvement of physicalproperties, micro structure and compressive strength.

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