Influence of Length of Moist Curing Time on Weight Change Behavior and Chloride Ion Permeability of Concrete Containing Silica Fume

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Title: Influence of Length of Moist Curing Time on Weight Change Behavior and Chloride Ion Permeability of Concrete Containing Silica Fume

Author(s): Stella L. Marusin

Publication: Special Publication

Volume: 114

Issue:

Appears on pages(s): 929-944

Keywords: chlorides; concretes; curing; moist curing; permeability; silica fume; weight measurement; Materials Research

Date: 5/1/1989

Abstract:
Purpose was to study the influence of the length of moist curing time on weight change behavior, chloride ion content, and chloride ion distribution profile through 10 cm concrete cubes made from concretes containing silica fume. Three concretes containing 2.5, 5, and 10 percent silica fume by weight of cement were prepared and tested. The concrete cubes were moist cured for 1, 3, 7, and 21 days. Then, after 21 days of air drying, all the cubes were immersed in 15 percent NaCl solution for 21 days. Following the 21-day soaking period and a subsequent 21-day final air-drying period, chloride ion contents at four different depths were determined using a potentiometric titration procedure. The test results showed that weight gain rate and chloride ion penetration in all tested concretes decreased when the length of moist curing period increased. All tested concretes showed the best performance for both reductions after the maximum moist curing period of 21 days used in this study.