Reactivity based approach for classifying fly ash
- Michigan Technological Univ., Houghton, MI (United States)
A major impediment to increased utilization of coal fly ash in portland cement based concrete is a lack of an adequate ash classification procedure that correlates effectively with material performance. The current procedure for classifying fly ash (ASTM C 618-94a) for use in concrete does not provide an accurate measure of expected performance. A classification procedure, based on measures of fly ash reactivity, would serve as a better predictor of performance in concrete. This paper provides an overview of the existing provisions contained in the classification procedures for a number of cementitious and pozzolanic materials, including portland cement, ground granulated blast furnace slag, silica fume, and coal fly ash. The rationale for an approach to develop a reactivity based classification for fly ash is also presented.
- OSTI ID:
- 389895
- Report Number(s):
- CONF-960426--
- Country of Publication:
- United States
- Language:
- English
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