FREEZING-AND-THAWING TESTS OF CONCRETES OF VARIOUS STRENGTHS AND AIR CONTENTS.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS
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The primary purpose of this study was to develop information on frost resistance, compressive strength, water permeability, and air-void spacing factor for 14 selected concrete mixtures. The work, which was divided into two phases, consisted of the fabrication and testing of 6- by 12-in. concrete cylinders and 3-12- by 4-12- by 16-in. concrete beams. The variables in the tests were cement type, cement factor, air content, and type of curing. The results indicated that concrete containing a blend of natural and portland cement differs from concrete containing only portland cement in that the blended concrete develops strength more slowly, is generally more resistant to freezing and thawing, and requires a less close bubble spacing for a given durability. The water permeability values of both types of concrete were approximately the same. It was found that the age and strength required for the concretes to develop a given durability can be estimated. It was also found that concrete cured while wrapped in polyethylene was more frost-resistant than fog-cured concrete, and that, in order to resist freezing and thawing, all mixtures required sufficient strength as well as an air-void spacing factor of less than 0.009 in. It was concluded that current procedures for the protection of concrete from freezing and thawing may be inadequate, and that, for concrete in important structures such as Eisenhower Lock of the St. Lawrence Seaway, protective measures probably should be expanded. Author
- Ceramics, Refractories and Glass
- Structural Engineering and Building Technology