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Kinetics of Slag Hydration in the Presence of Calcium Hydroxide
Author(s) -
Biernacki J. J.,
Richardson J. M.,
Stutzman P. E.,
Bentz D. P.
Publication year - 2002
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2002.tb00445.x
Subject(s) - kinetics , ground granulated blast furnace slag , chemistry , slag (welding) , calcium hydroxide , thermogravimetric analysis , portland cement , hydroxide , reaction rate constant , chemical kinetics , reaction rate , hydration reaction , lime , activation energy , inorganic chemistry , mineralogy , metallurgy , cement , materials science , organic chemistry , catalysis , physics , quantum mechanics
The reaction between ground granulated blast furnace slag (GGBFS) having an empirical formula of C 7.88 S 7.39 M 3 A and calcium hydroxide (CH) was investigated. The kinetics of the reaction were explored. Thermogravimetric analysis was used to monitor the consumption of CH from which rate constants were determined. Based on Knudsen's kinetic model, activation energies of 14.5, 17.9, and 22.6 kJ/mol were determined for three different mass ratios of slag and CH reacted over a temperature range of 15° to 50°C and hydrated for a period of time from 0 to 32 days. A comparison of the kinetics of the slag/CH reaction was made with slag/portland cement hydration. The basic features of both appear similar.