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Relation Between Porosity and Compressive Strength of Fly Ash Concrete
Chen, Tsai Shou
The object of the research is to investigative the pore structure of fly ash concrete and the relations between porosity and compressive strength. Three water to binder ratios (0.35, 0.50, 0.70) and three substitute ratios of cement with fly ash (10％,20％,30％)were selected for preparing concrete samples. They were tested at 6 ages (0~91 days)for compressive strength and MIP porosity measurement.
Test results show that the fly ash concrete consisted of more micropores of under 0.05μm at early age(7 day), but this portion of micropore evidently decreased after 28days. It is attributed to the pozzolanic reaction of fly ash at later age, the C-S/A-H gel will fill the micropore and enhance the strength of concrete. It was also found that the capillary pore volume had most intimate relation with the strength of fly ash concrete. A relation equation was proposed for the prediction of strength.
|Appears in Collections:||土木工程學系所|
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