Experimental studies on rheological properties of conventional vibrated concrete using direct shear box
  Ajay N., Ashwin. M. Joshi, Girish. S. and Harshitha M.R.
  Transformation in the field of concrete technology has resulted in concrete mixes with newer ingredients along with high desired properties. Till date, slump test is used to measure the fresh properties of concrete. Slump test is factually incapable of providing satisfactory flow characteristics of fresh concrete. To overcome this, rheological methods are adopted and fresh concrete is characterized by two parameters namely yield stress and plastic viscosity. These parameters provide better understanding, thereby resulting in efficient and improved construction processes. In this study, rheological properties of conventional vibrated concrete were investigated using a simple direct shear box. The concrete mixes were proportioned based on absolute volume concept. About 108 trials were considered with three different shear rates of 0.25, 0.625, 1.25 mm/min and three different normal stresses of 0.025, 0.05, 0.10 MPa. The results show that, concrete shear box can be effectively used as an additional instrument for finding rheological properties (yield stress and plastic viscosity) of fresh concrete under static condition with low shear rates.
 

Back