Title:
Simulation of Low-Calcium Fly Ash Blended Cement Hydration
Author(s):
Xiao-Yong Wang, Han-Seung Lee, and Ki-Bong Park
Publication:
Materials Journal
Volume:
106
Issue:
2
Appears on pages(s):
167-175
Keywords:
cement hydration; fly ash; pozzolanic reaction; simulation.
DOI:
10.14359/56464
Date:
3/1/2009
Abstract:
Low-calcium fly ash (FL) has been widely used as a mineral admixture in normal and high-strength concrete. Hydration of cement blended with fly ash is much more complex than ordinary portland cement because of the pozzolanic activity in an aluminosilicate glass phase in fly ash. This paper presents a kinetic hydration model that is based on a multi-component concept and can simulate hydration of cement-FL blends. The proposed model starts with a mixture proportion of concrete and considers both portland cement hydration and pozzolanic activity. By applying the proposed model, this paper predicts the following properties of hydrating cement-FL blends as a function of hydration time: reaction ratio of fly ash, calcium hydroxide content, heat evolution, porosity, chemically bound water, and the development of the compressive strength of FL-concrete. The prediction results showed good agreement for the results of the experiment performed in this study.