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Publication:
Portland-Cement
Concrete Rheology and Workability: Final Report
FHWA-RD-00-025, April 2001
(PDF-2,844KB)
Contact:
Dr. Cheryl Richter at cheryl.richter@fhwa.dot.gov
Abstract:
Methods for determining the workability of freshly mixed portland-cement
concrete with slumps less than 51 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.
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