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HomeMaterials Science ForumMaterials Science Forum Vol. 857The Use of Borax in Deterring Flash Setting of...

The Use of Borax in Deterring Flash Setting of High Calcium Fly Ash Based Geopolymer

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Abstract:

Geopolymer that was made with high CaO content fly ash was found to have higher compressive strength than the low CaO fly ash, using the same mixture composition. This effect could be due to the physico-chemical properties of the fly ash, in respect to its particle size or the chemical composition. Although it was not widely published, the occurrence of flash setting of geopolymer was known to occur when using high CaO content fly ash as the precursor. Geopolymer paste may solidify within minutes after the addition of alkali activators, making it very difficult to cast in big volume. This paper investigate the effect of borax addition to the high calcium fly ash-based geopolymer mixture to reduce the occurrence of flash setting. It was found that the setting time can be extended significantly, with the addition of 5% borax, by mass, of fly ash. The addition of borax also have positive effect on increasing the compressive strength of geopolymer.

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Advanced Materials Engineering and Technology IV

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Periodical:

Materials Science Forum (Volume 857)

Pages:

416-420

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.857.416

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Online since:

May 2016

Authors:

Antoni Antoni*, Stephen Wibiatma Wijaya, Juan Satria, Agung Sugiarto, Djwantoro Hardjito

Keywords:

Admixture, Borax, Flash Setting, Fly Ash, Geopolymer, High Calcium

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* - Corresponding Author

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