A scientific approach to measure the workability of concrete using concrete shear box
  Girish S., Ajay N., Girish Kumar S. and Hrushikesh M.
  Workability of concrete is measured by rheological properties to overcome the inadequacies of the empirical tests, in particular, the slump test and is based on material science approach. In rheological method, the fresh concrete is characterized by two parameters, namely yield stress and plastic viscosity. These parameters provide a better understanding of the transformed concrete of today, thereby enhancing the quality of concrete and designing a more economical and complex structures with improved construction processes. Generally, rheometers are used to assess the rheological properties of fresh concrete. Some of the key observations is that the stimulus provided to concrete during testing by rheometer, in general, is dynamic and normally a high speed torque is applied to shear the sample and this is in variance to the actual field condition that the concrete experiences and also there is no concurrence in the measured rheological properties by various rheometers. This paper describes a new unique procedure for finding the rheological properties of fresh concrete using a specially designed and fabricated concrete shear box based on material science approach. The concrete shear box can be effectively used as an additional instrument for finding the rheological properties (yield stress and plastic viscosity) of fresh concrete under static condition with low shear rates.