Influence of Fineness of Fly Ashes on Their Hydraulic Activity

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Title: Influence of Fineness of Fly Ashes on Their Hydraulic Activity

Author(s): Z. Giergiczny and A. Werynsk

Publication: Special Publication

Volume: 114

Issue:

Appears on pages(s): 97-116

Keywords: chemical properties; ettringite; evaluation; fly ash; grinding (communition); mortars (material); physical properties; research; portland cements; strength; tests; Materials Research

Date: 5/1/1989

Abstract:
Presents results of research work on the evaluation of physical-chemical properties of fly ashes and their influence on physical and mechanical properties of cement mortars. Two types of fly ash were examined: a low-calcium and a high-calcium. Variability of chemical composition with grain size of the fly ashes was analyzed. When testing the influence of physical and mechanical activation (fly ash grinding process) on hydraulic activity of the two types of fly ash, it was found that grinding had an activating effect on the high-calcium fly ash. Consequently, cements containing ground high-calcium fly ash were comparable in strength to pure portland cement. The main factor affecting strength properties was the formation of ettringite and its stabilization in the structure of hardened mortars and pastes.