Studies of Cement-Admixture Interactions Related to Aluminate Hydration Control by Isothermal Calorimetry

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Title: Studies of Cement-Admixture Interactions Related to Aluminate Hydration Control by Isothermal Calorimetry

Author(s): P. Sandberg and L. R. Roberts

Publication: Special Publication

Volume: 217

Issue:

Appears on pages(s): 529-542

Keywords: aluminate; cement-admixture interaction; hydration kinetics; isothermal calorimetry; sulfate; sulfate optimization

Date: 9/1/2003

Abstract:
The old concept for optimum sulfate content in portland cement developed by Lerch in 1946 was further applied to study and explain cement admixture interactions related to the soluble sulfate content in systems with portland cement, mineral and chemical admixtures. It was shown that Lerch's criteria for optimum sulfate in portland cement based on isothermal calorimetry is applicable also for studies of modem systems with multiple binders and admixtures. Indirect evidence on the cause of some cement-admixture interactions was provided by means of testing for the effect of additional soluble sulfate added to the cement prior to testing.