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This paper delineates the effects of temperature and relative humidity on static strength (fatigue) of hydrated portland cement mortar. An experimental program involving the static loading of small cement-sand beams at varying conditions of temperature and relative humidity was undertaken to obtain information on the time required for fracture. This data was analyzed with a statistical procedure developed for truncated, lognormal distributions. The results are presented as cumulative probability distributions. A stress-corrosion mechanism dependent on the presence of calcium hydroxide is postulated as a result of this study.
Assistant project engineer, E. D'Appolonia Consulting Engineers, Inc., Pittsburgh, Pa.
Professor of civil engineering, Carnegie-Mellon University, Pittsburgh, Pa.
Stock #: JTE10509J