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http://dx.doi.org/10.14190/JRCR.2021.9.4.578

A Hydration Reaction and Strength Development Properties of Cement Using Pond Ash in Coal Fired Power Plant  

Lee, Jae-Seung (Construction Materials Center, Korea Conformity Laboratories)
Noh, Sang-Kyun (Construction Materials Center, Korea Conformity Laboratories)
Shin, Hong-Chul (Construction Materials Center, Korea Conformity Laboratories)
Publication Information
Journal of the Korean Recycled Construction Resources Institute / v.9, no.4, 2021 , pp. 578-584 More about this Journal
Abstract
This study comparatively analyzed the properties of hydration reaction and strength development of four types of pond ash(PA) and fly ash(FA), aiming for the effective use of PA. The PA whose chlorine content was highest due to the seawater movement method had a faster setting time, higher cumulative heat, and greater initial strength development than those of FA due to the acceleration of the cement hydration reaction. However, the activity factor increase rate decreased after seven days of curing due to the rapid generation of early hydrates. The PA that contained impurities, such as a large amount of unburned carbon, had a delayed setting time due to the lower hydration reaction. Moreover, the strength was degraded in all curing ages. The PA whose chlorine content was lower due to the freshwater movement method and the amorphous content exhibited similar hydration reactivity and strength development characteristics compared to that of FA. The thermogravimetric analysis results verified that it had a similar level of Ca(OH)2 consumption and pozzolanic reactivity with that of FA. Conclusively, it is necessary to expand the application of the freshwater movement method and manage the ignition loss to raise PA's usability.
Keywords
Fly ash; Pond ash; Hydration reaction; Strength development;
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Times Cited By KSCI : 1  (Citation Analysis)
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