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Presented at the 1983 Fall Convention, American Concrete Institute, Kansas City; Missouri, September 25-30. Publication rights reserved by the American Concrete Institute. Permission is granted to other journals to publish reviews, condensations, or abstracts prior to the publication of the complete paper by ACI provided these condensations do not exceed 500 words or 1/3 of the total content of the original paper, whichever is shorter, and provided acknowledgement is given to author(s) and presentation at the ACI 1983 Fall Convention.

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