Comparison of Four Different Methods of Determining Drying Shrinkage of Concrete Masonry Units

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Title: Comparison of Four Different Methods of Determining Drying Shrinkage of Concrete Masonry Units

Author(s): J. O. Bryson and David Watstein

Publication: Journal Proceedings

Volume: 58

Issue: 8

Appears on pages(s): 163-184

Keywords: none

Date: 8/1/1961

Abstract:
Four different procedures for determining the drying shrinkage of concrete masonry units were compared to determine their suitability as possible standard test methods. The test procedures differed mainly by the conditions under which the specimens were dried and were designated RT-50 (73 F and 50 percent relative humidity), RT-30 (73 F and 30 percent r e l a t i v e humidity), Modified British (122 F and 17 ‘percent relative humidity), and Rapid (220-935 F). In addition to varying the dryina conditions. The size and shape of test specimens were also varied. The drying-shrinkage test was performed using all four procedures on both autoclaved and low-pressure steam cured block of sand and gravel, cinders, expanded slag, ex-panded shale, and pumice aggregates.