Title: Modified ASTM C359 Early Stiffening of Mortar to Anticipate Complex Cement Admixture Interactions

Author(s): Ara A. Jeknavorian

Publication: Web Session

Volume: ws_2016_07.11_Jeknavorian_MAESMACCAI.pdf

Issue:

Appears on pages(s):

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DOI:

Date: 11/4/2015

Abstract:
Chemical admixtures and various types of cementitious materials and fillers are increasingly being incorporated in modern cement-based materials and have significant influence on the constructability and performance of concrete structures. The interaction of cementitious materials and admixtures has significant effect on concrete performance, including rheology and thixotropy, fluidity retention, stability, hydration kinetics, setting, temperature development, microstructure, and development in mechanical and transport properties. The effect of an admixture is greatly influenced by the chemistry and form of the cementitious materials used and type and composition of the polymers used for the admixture. The session will discuss various test methods that can be used to evaluate early stiffening of cement paste or mortar to anticipate complex cement-admixture interactions. The session will also highlight recent findings aiming at understanding the physical and chemical phenomena affecting the adsorption of chemical admixtures on binder materials and the resulting effects on fresh and hardened properties of concrete. The session should be of interest to researchers, concrete engineers, material suppliers, and students dealing with modern materials design and construction. Attendees will become aware of recent advances in testing techniques and governing mechanisms affecting cement-admixture interaction.