Comparative results of utilization of fly ash, silica fume and GGBFS in reducing the chloride permeability of concrete

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Title: Comparative results of utilization of fly ash, silica fume and GGBFS in reducing the chloride permeability of concrete

Author(s): William e. Ellis, Jr., Eugene H. Riggs, and W. B. Butler

Publication: Special Publication

Volume: 126

Issue:

Appears on pages(s): 443-458

Keywords: blast furnace slag; chlorides; compressive strength; concretes; durability; fly ash; permeability; silica fume; superplasticizers; Materials Research

Date: 8/1/1991

Abstract:
This research project was undertaken to determine the effect on the chloride permeability of concretes of increasing amounts of fly ash in low water-cementitious material ratio concrete as compared with comparable high-quality concretes containing combinations of portland cement, silica fume, and ground-granulated blast furnace slag. The test method utilized was the Rapid Determination of the Chloride Permeability of Concrete (AASHTO T-277). Fifteen superplasticized concrete mixtures were evaluated for compressive strength at ages of 28 and 56 days, and for chloride permeability at 56 days. The inclusion of fly ash, silica fume, and ground-granulated blast furnace slag all significantly reduced the chloride permeability of concrete as compared with concrete containing only portland cement. Increasing amounts of fly ash generally showed decreased permeability in the tests conducted.