WES FIBROUS CONCRETE PROGRAM
In July 1975, 50 concrete beams were installed at half-tide elevation on the exposure rack at Treat Island, Maine, to determine the effects of sea water and freezing and thawing action on the flexural strength and other properties of various fiber concretes. The beams were made from nine different mixtures. The fine and coarse aggregates were manufactured limestone sand and ¾-in. maximum limestone, respectively. All mixtures contained a water-reducing admixture (Admixture B) and five mixtures contained an air-entraining admixture (Admixture A).	Type II portland cement was used in the amount of 7.89 cwt per cu yd except for Mixtures N and O, which contained 11.0 cwt per cu yd The water cement ratio was 0.45 for all mixtures. The number and types of beams exposed are as follows: 12 each 6- by 6- by 30-in., 21 each 6- by 6- by 36-in., and 17 each 9- by 9- by 45-in. The 9- by 9- by 45-in. beams were yoked and stressed by third-point loadings to working loads of 35 percent of ultimate. Data Tables give the exposure record of the specimens. More mixture data are tabulated in the Mixture Table.

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