Factors Affecting the Compressive Strength of Class C Fly Ash Geopolymer

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The compressive strength of geopolymer prepared from a class C fly ash (CFA) at different curing conditions and mass ratio of water to fly ash were investigated. The geopolymer was activated with a mixed solution of sodium hydroxide (NaOH) and sodium silicate. The results revealed that the obtained compressive strength was in the range of 11.7~61.9MPa and the compressive strength decreased with the increment of the mass ratio of water to CFA (W/F). The geopolymer samples with the highest strength were obtained when W/F was 0.30 with proper delay time 1d before being demoulded and then followed by curing at 60°C for 24h. For geopolymer with lower W/F (0.30), its optimum curing temperature was better not higher than 60°C, however, for the higher W/F, the curing temperature was suit to more than 70°C.

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Periodical:

Edited by:

Xuejun Zhou

Pages:

960-964

DOI:

10.4028/www.scientific.net/AMM.99-100.960

Citation:

X. Y. Li et al., "Factors Affecting the Compressive Strength of Class C Fly Ash Geopolymer", Applied Mechanics and Materials, Vols. 99-100, pp. 960-964, 2011

Online since:

September 2011

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$35.00

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