A laboratory study on the effect of fly ash, silica fume, and aggregate type on mechanical properties and permeability of concretes
Fifty-eight concrete batches were made to study the effects of fly ash, silica fume, and aggregate type on mechanical properties and permeability of concretes. Class F fly ash was used at the levels of 10 to 50% as cement replacement on an equal weight basis. Silica fume was used at the levels of 5 to 15%. The combined effects of fly ash and silica fume on these properties of concrete were also investigated. Results form the water permeability tests were correlated to the results from the standard rapid chloride permeability and water absorption tests. Results indicate that fly ash and silica fume have significant effects on strengths and permeability of concretes. Strength gain of the silica fume concrete can be achieved at early age. The fly ash and the silica fume concretes show significantly lower permeability than that of the control concrete. Initial and prolonged moist curing is essential for the fly ash concrete. The concrete containing dense limestone, with rough surface texture and angular shape particles, exhibits highest strength and lowest permeability.
- Research Organization:
- Florida Univ., Gainesville, FL (United States)
- OSTI ID:
- 7228772
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010800 -- Coal
Lignite
& Peat-- Waste Management
36 MATERIALS SCIENCE
360603* -- Materials-- Properties
360606 -- Other Materials-- Physical Properties-- (1992-)
AEROSOL WASTES
ASHES
BUILDING MATERIALS
CHALCOGENIDES
COMBUSTION PRODUCTS
CONCRETES
FLY ASH
MATERIALS
MECHANICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PERMEABILITY
RESIDUES
SILICON COMPOUNDS
SILICON OXIDES
WASTE PRODUCT UTILIZATION
WASTES