Certification of SRM 2492: Bingham Paste Mixture for Rheological Measurements As measurements with rheometers can involve flow in a complex geometry, it is important that they are calibrated with a standard reference material (SRM). NIST has produced a Standard Reference material for paste (SRM 2492) as the first step for the development of a reference material for concrete rheometers. The process used to develop both the SRM 2492 and the mortar reference material is presented, including measurements, statistical analyses, and modeling. The developed SRM consists of a mixture of two components, corn syrup and fine limestone and has the texture of cement paste.
Hrsg.: Chiara F. Ferraris; Paul E. Stutzman; William F. Guthrie; National Institute of Standards and Technology (NIST), 2012
Fresh Concrete Rheology - Recent Developments An overview of the tests that are commonly used to measure the rheology of fresh concrete and methods to predict the flow of concrete from either compositon or laboratory tests. Materials Science of Concrete VI. Proceedings, 2001. Hrsg.: Ferraris et al, National Institute of Standards and Technology, 2001
Influence of Mineral Admixtures on the Rheology of Cement Paste and Concrete Rheological tests on cement paste were used to successfully select the type and dosage of mineral admixtures that improved concrete workability. Among the six different mineral admixtures tested, the ultra fine fly ash was determined to give the best results by reducing the yield stress and viscosity. Hrsg.: Ferraris et al, Nachdruck aus: Cement and Concrete Research, Vol. 31, No.2, 245-255, 2001
Rheological Nomenclature A guide to the nomenclature in rheology and rheometric measurements. It has been written particularly for use in ceramic sciences and provides definitions of terms and expressions relating to the measurement of rheological properties in liquid-based particulate systems (suspensions, pastes and gels). Hrsg.: Hackley, V. A.; Ferraris, C. F.; National Institute of Standards and Technology, 2001
Comparison of Concrete Rheometers Summary of the test performed in France in October 2000 to compare five concrete rheometers. Hrsg.: L.E. Brower, C.F. Ferraris, in: Concrete International, Vol. 25, No. 8, 41-47, August 2003
Modified Slump Test to Measure Rheological Parameters of Fresh Concrete The ease of placement of concrete depends upon at least two physical properties, the yield stress and plastic viscosity. Currently the most common field test is the slump test, and it is related only to the yield stress. Therefore, a simple field test method intended to provide an evaluation of the two Bingham rheological parameters, yield stress and plastic viscosity, was developed. To determine the plastic viscosity the time necessary for the upper surface of the concrete in the standard slump cone to slump 100 mm was measured. The apparatus and test procedure are described. Hrsg.: National Institute of Standards and Technology, Building and Fire Research Laboratory, 1998
Comparison of Concrete Rheometers Comparison of measurements from five types of concrete rheometers (four of them are commercial available). The aim was to provide data to establish correlations among them. The Rheometers are named: BML (Island), BTRHEOM (France), CEMAGREF-IMG coaxial rheometer (France), IBB (Canada), Two-Point (UK). Hrsg.: Ferraris et al, National Institute of Standards and Technology, 2001