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Reference materials for rheometers and the ASTM flow table



Author(s): C.F. Ferraris, Z. Li, M. Mohseni, N. Franson
Paper category: Symposium
Book title: 3rd International RILEM Symposium on Rheology of Cement Suspensions such as Fresh Concrete
Editor(s): O.H. Wallevik, S. Kubens, S. Oesterheld
ISBN: 978-2-35158-091-2
e-ISBN: 978-2-35158-092-9
Pages: 257- 264
Total Pages: 8
Language: English


Abstract: 
Oil is the most frequently used standard material for the calibration of rheometers. Other products are used to calibrate flow devices; e.g., the flow table is calibrated using a fluid composed of oil and silica powder. The oil is a Newtonian fluid, while the oil-silica powder mixture is non-Newtonian. Using this mixture of oil-silica powder as a reference material for cement paste and adding aggregates to scale up to concrete has the drawback that it is hard to clean a large rheometer full of an oil mixture. This paper will present two aspects of the development of a reference material for rheometers and for the ASTM International (ASTM) flow table. First, the flow table calibration will be analyzed using an approach based on fundamental rheological measurements and characterization of the components (oil and silica powder). Second, the development of a non-toxic reference material will be discussed. The combination of these two topics would illustrate the challenges involved in the measurement and development of a granular reference material.


Online publication: 2009
Publication Type: full_text
Public price (Euros): 0.00