Biyanvilage Dareeju

Estimation of Poisson's ratio and variation of tensile yield strength of composite clay balls used in pebble matrix filtration

Clay balls can be used as alternatives to natural pebbles in pebble matrix filtration, a device for drinking water treatment. These clay balls are subjected to stresses due to self-weight and overburden in water saturated conditions. Although there are empirical relationships for evaluating tensile yield strength (Ts) of clay balls using Poisson’s ratio (µ), diameter (d) of clay balls, and failure polar force (Fs), so far for such calculations the value of Poisson’s ratio (µ) was taken from studies based on clay bricks. However, during ball preparation if clay is mixed with other raw materials from industry wastes such as saw dust or alum sludge in order to enhance the pollutant removal properties of the filter media, then the Poisson’s ratio (µ) of composite balls would be quite different to that of clay bricks. This paper describes a novel method for estimating Poisson’s ratio (µ) of composite clay balls by measuring vertical deformation using linear variable displacement transducers (LVDTs) in uniaxial compressive strength (UCS) apparatus and lateral deformation using particle image velocimetry (PIV).

Estimation of Poisson’s Ratio and Variation of Tensile Yield Strength of Composite Clay Balls Used in Pebble Matrix Filtration

AbstractClay balls can be used as an alternative to natural pebbles in pebble matrix filtration, a method for drinking water treatment. These clay balls are subjected to stresses due to self-weight...