Portland-cement concrete rheology and workability : final report.
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2011-04-01
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OCLC Number:823306129
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Edition:final report; Oct. 1996-May 1999.
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance
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Abstract:Methods for determining the workability of freshly mixed Portland-cement concrete with
slumps less than 5 1 mm (2 in) were investigated. Four potential methods to determine the
workability of concrete were proposed for evaluation and development. The methods included
two moving-object methods, one free-orifice method, and a vibrating-slope method. The
report outlines modifications to these existing techniques and equipment to permit the
measurement of rheological properties at two or more shear rates. The vibrating-slope
apparatus (VSA) was selected for further development. (Questions about this report should be
addressed to Dr. Paul F. Mlakar, Sr., Chief, Concrete and Materials Division, or Mr. G. Sam
Wong, Research Geologist, ERDC, Structures Laboratory.)
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