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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 711Microscopic Investigation of Geopolymers Made of...

Microscopic Investigation of Geopolymers Made of Fused Slag from Gasification Processes Using Low-Grade Coal and Spent Catalyst Slag

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Abstract:

Geopolymers are prospective cement substitutes because their production generates smaller amounts of carbon dioxide and they have sufficient mechanical strength. Geopolymers have attracted increasing interest from construction industries because of their recyclability and eco-friendliness. The compressive strength of geopolymers is known to be associated with their Si/Al ratio. Fused slag from gasification processes using low-grade coal (FSLC) and spent catalyst slag (SCS) were used as raw materials for making geopolymers; the Si/Al ratio was controlled by mixing different ratios of FSLC and SCS. The compressive strength of a geopolymer with a Si/Al ratio of 1.04 had the highest strength (125.6 MPa). Scanning electron microscopy (SEM) analysis was also in good agreement with the compressive strength measurements of compressive strength. There were many small crystallites in the geopolymer matrix. Using transmission electron microscopy (TEM), these crystallites were found to be single crystals, which have a perfect crystal structure. It is speculated that the formation of small crystallites 10-30 nm in size, as well as large single crystals with diameters greater than 80 nm, in the matrix of a geopolymer during the geopolymerization process might increase its compressive strength.

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Mechanical Engineering, Materials Science and Civil Engineering III

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Periodical:

Applied Mechanics and Materials (Volume 711)

Pages:

235-244

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.711.235

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Online since:

December 2014

Authors:

Yoo Taek Kim*, Jun Won Choi, Seong Yeol Kim

Keywords:

Compression Molding, Crystallinity, Fused Slag from Gasification Processes Using Low-Grade Coal, Geopolymer, Si/Al Ratio, Spent Catalyst Slag, TEM

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© 2015 Trans Tech Publications Ltd. All Rights Reserved

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