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Falling Ball Viscometer
The basic parameter influencing the performance of the fresh SCC in casting is its rheological properties. Thus, studying the rheology of SCC has become one of the central issues at ACBM. Concrete rheometers with various sensor geometries were designed and used in the past ten years. A comparison of different rheometers was conducted at the National Institute of Standards and Technology (NIST). The study showed that for the same concrete mixtures, different rheometers yielded different results. The reasons could be attributed to various geometries of the sensors and rheometers, testing procedure and the inhomogeneity of the material itself. Another way to investigate the rheological behavior of materials can be made with the application of a falling/pulling ball viscometer. The viscosity calculation is based on the velocity of the moving ball and the equilibrium of forces. The external forces are normally traced with a pulley system or the intensity of a magnetic field, neither of which is suitable for field measurement. The objective of this research is to design a falling ball viscometer, which can be used under both the lab and field conditions.
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