Kinetics of Hydration and Hardening Processes in Clinkerless Slag-Alkaline Binder Materials

Abstract:

The purpose of the present work is to research the process of hardening clinkerless slag-alkaline binder materials during the early stage of interaction between the ground granulated blast-furnace slag and the alkaline component by the thermokinetic method. The amount of heat emitted during the interaction between slag and alkaline component, and the influence of the duration of slag pre-hydration period upon this process have been assessed. These values were compared to similar values for binder materials based on portland cement. It was shown that ageing has significantly larger influence on heat emission during hydration of portland cement and on concrete strength.
We have elaborated in more detail the mechanism of hydration reaction of slag-alkaline binder materials starting at the level of active centers on the surface in accordance with the process of self-decelerating forming of crystallization centers. As slag grains are covered with a layer of hydrates, kinetics of hydration till the end of reaction is regulated by the process of diffusion that depends on the degree of structural irregularity.

• Periodical: Applied Mechanics and Materials (Volumes 725-726)
• Pages: 499-504
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.725-726.499
• Online since: January 2015
• Authors: Tatyana Petrova*, Valentina Prokofieva
• Keywords: Active Centers, Clinkerless Slag-Alkaline Binder Materials, Heat of Hydration, Pre-Hydration, Setting Time, Surface Defects, Thermokinetic Curves

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