Resistance to Chloride Ion Penetration of Concretes Containing Fly Ash, Silica Fume, or Slag

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Title: Resistance to Chloride Ion Penetration of Concretes Containing Fly Ash, Silica Fume, or Slag

Author(s): C. Ozyildirim and W. Halstead

Publication: Special Publication

Volume: 108

Issue:

Appears on pages(s): 35-62

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

Date: 8/1/1988

Abstract:
The effects of two pozzolanic admixtures, fly ash and silica fume, and a ground-granulated blast furnace slag on the chloride ion intrusion of concretes prepared with low water-to-cementitious material ratios (0.35 to 0.45) were investigated. Results of the rapid permeability test (AASHTO T 277) showed that the resistance of concrete to the penetration of chloride ions increases significantly as the water-to-cementitious material ratio is decreased for the same proportions of solid ingredients. Most concretes with pozzolans or slag exhibited higher resistance to chloride ion penetration than the control concretes containing portland cement as the cementitious material. Results of the 90-day ponding test (similar to AASHTO T 259), which was conducted with 0.40 w/c concretes only, indicated minimal chloride content at depths below 3/4 in. (19 mm) for all the test concretes. Strength values for all concretes made with the pozzolans and slag at 90 days were in excess of 5000 psi (34.5 MPa), which is satisfactory.