Monitoring Hydration of Alkali-Activated Slag and Fly Ash


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Title: Monitoring Hydration of Alkali-Activated Slag and Fly Ash

Author(s): H.C. Ezirim and W.J. McCarter

Publication: Special Publication

Volume: 178


Appears on pages(s): 821-836

Keywords: calcium hydroxide; capacity; conductivity; fly ash; slag.

Date: 6/1/1998

This paper presents developments in electrical impedance methods to study hydration and reaction kinetics of alkali activated slags and fly ash at room temperature (i.e. 21°C). To highlight the testing methodology, work focuses on monitoring the temporal change in both conductance and capacitance of a typical slag and low-lime fly ash activated with calcium hydroxide. Measurements were taken over time scales extending up to six days hydration. It is also shown that the measured electrical parameters change markedly with frequency of applied electrical field. The latter was found particularly relevant to capacitance measurements.