<abstract xmlns="http://www.w3.org/1999/xhtml"><p>Extensive experimental investigations were carried out to evaluate the rheological behaviour of fly ash (FA) slurry without and with the addition of bottom ash (BA) and BA slurry without and with the addition of FA. The FA slurries exhibited Bingham behaviour at solid mass concentrations ranging from 60–65% and mixing proportions from 10– 40%. A substantial reduction in yield stress was observed except for mixing proportion of 40% on which the yield stress and viscosity were increased drastically for all solid concentrations. Hence, it can be concluded that the yield stress and viscosity of FA slurry were very much influenced by adding BA up to the mixing proportion of 30%. The rheological behaviour of BA slurries with and without the addition of FA in proportions of 10–50% was investigated and exhibited Newtonian behaviours for solid mass concentrations ranging from 30–50% without and with the addition of FA. The viscosity increases with increasing the solid concentrations and proportion of FA. Based on these experimental data, a correlation was developed to predict the relative viscosity of BA slurries as a function of solid volume fraction and FA mass proportion of 0–50% and the RMSE and R<sup>2</sup> values showed good agreement between the experimental and the predicted data.</p></abstract>

Extensive experimental investigations were carried out to evaluate the rheological behaviour of fly ash (FA) slurry without and with the addition of bottom ash (BA) and BA slurry without and with the addition of FA. The FA slurries exhibited Bingham behaviour at solid mass concentrations ranging from 60–65% and mixing proportions from 10– 40%. A substantial reduction in yield stress was observed except for mixing proportion of 40% on which the yield stress and viscosity were increased drastically for all solid concentrations. Hence, it can be concluded that the yield stress and viscosity of FA slurry were very much influenced by adding BA up to the mixing proportion of 30%. The rheological behaviour of BA slurries with and without the addition of FA in proportions of 10–50% was investigated and exhibited Newtonian behaviours for solid mass concentrations ranging from 30–50% without and with the addition of FA. The viscosity increases with increasing the solid concentrations and proportion of FA. Based on these experimental data, a correlation was developed to predict the relative viscosity of BA slurries as a function of solid volume fraction and FA mass proportion of 0–50% and the RMSE and R2 values showed good agreement between the experimental and the predicted data.

Experimental study on the rheological behaviour of coal ash slurries

Department of Civil Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi - 110016, India.

Journal of Hydrology and Hydromechanics

This chapter is distributed under the terms of the Creative Commons Attribution 4.0 Public License.

{"article-title":"Experimental study on the rheological behaviour of coal ash slurries"}

Extensive experimental investigations were carried out to evaluate the rheological behaviour of fly ash (FA) slurry without and with the addition of bottom ash...

Experimental study on the rheological behaviour of coal ash slurries

Published Online: Oct 20, 2015

Page range: 303 - 310

Received: Nov 10, 2014

Accepted: Apr 01, 2015

DOI: https://doi.org/10.1515/johh-2015-0029

Keywords
Coal ash slurry, Newtonian fluid, Yield stress, Plastic viscosity, Relative viscosity

© 2015 K.M. Assefa et al., published by De Gruyter Open

This chapter is distributed under the terms of the Creative Commons Attribution 4.0 Public License.

Experimental study on the rheological behaviour of coal ash slurries

Published Online: Oct 20, 2015

Page range: 303 - 310

Received: Nov 10, 2014

Accepted: Apr 01, 2015

DOI: https://doi.org/10.1515/johh-2015-0029

KeywordsCoal ash slurry, Newtonian fluid, Yield stress, Plastic viscosity, Relative viscosity

© 2015 K.M. Assefa et al., published by De Gruyter Open

This chapter is distributed under the terms of the Creative Commons Attribution 4.0 Public License.

Keywords
Coal ash slurry, Newtonian fluid, Yield stress, Plastic viscosity, Relative viscosity