The apparatus for a comprehensive set of creep tests on clay masonry prisms is described. The apparatus was designed to be self-sufficient should components fail in that the tests are intended to last for a minimum of fifteen years. Three series of tests have been begun examining the effect of the following variables on creep: unit, mortar, stress, moisture condition, and age at loading. The moisture condition of the unit when laid and the temperature during the rest period were not investigated. Preliminary assessment of the data reveals that creep in clay masonry occurs for at least 2500 days: and creep varies with both moisture condition and age at loading. Analysis through the use of specific creep for a specific mortar/unit combination may not be possible.


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