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HERO ID
6862416
Reference Type
Journal Article
Title
Workability and strength of coarse high calcium fly ash geopolymer
Author(s)
Chindaprasirt, P; Chareerat, T; Sirivivatnanon, V; ,
Year
2007
Is Peer Reviewed?
Yes
Journal
Cement and Concrete Composites
ISSN:
0958-9465
Publisher
ELSEVIER SCI LTD
Location
OXFORD
Page Numbers
224-229
DOI
10.1016/j.cemconcomp.2006.11.002
Web of Science Id
WOS:000244702400008
Abstract
In this paper, the basic properties viz., workability and strength of geopolymer mortar made from coarse lignite high calcium fly ash were investigated. The geopolymer was activated with sodium hydroxide (NaOH), sodium silicate and heat. The results revealed that the workable flow of geopolymer mortar was in the range of 110 +/- 5%- 135 +/- 5% and was dependent on the ratio by mass of sodium silicate to NaOH and the concentration of NaOH. The obtained compressive strength was in the range of 10-65 MPa. The optimum sodium silicate to NaOH ratio to produce high strength geopolymer was 0.67-1.0. The concentration variation of NaOH between 10 M and 20 M was found to have a small effect on the strength. The geopolymer samples with high strength were obtained with the following practices: the delay time after moulding and before subjecting the sample to heat was 1 h and the optimum curing temperature in the oven was 75 degrees C with the curing duration of not less than two days. (C) 2006 Elsevier Ltd. All rights reserved.
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