Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4918144 | Construction and Building Materials | 2017 | 13 Pages |
Abstract
The utilisation of fly ash is a global concern. Under conditions of mass production and rapid turnover in automated plants, a reduction in the curing duration of alkali-activated fly ash based mixtures is sought-after. An alternative accelerated curing technique, confined-DEC (Direct Electric Curing), with the binding mechanism of NaOH activation of fly ash was investigated for the rapid manufacture of fly ash based bricks. This concept is a potentially viable alternative solution for high-volume fly ash utilisation. The investigation revealed that the confined-DEC technique shows great promise in the rapid accelerated curing of NaOH-activated fly ash based brick mixtures. The best induced design conditions, a mixture consisting of 4.1% NaOH, 9% water and 86.9% fly ash by weight, simultaneously subjected to a confining pressure of 10Â MPa and a voltage gradient of 0.8Â V/mm, obtained a compressive strength of 11.5Â MPa in 7Â min and the mixture continued to increase in compressive strength after the application of confined-DEC, acquiring a compressive strength of 20.1Â MPa at 28Â days. The investigation also revealed the limitations of confined-DEC under free drainage conditions.
Related Topics
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Authors
Mateusz Ziolkowski, Maxim Kovtun,