Publicou 6 edições por ano
ISSN Imprimir: 2152-5102
ISSN On-line: 2152-5110
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Effect of Additive on the Rheological Characteristics of Slurries of Fly Ash and Bottom Ash Mixture at High Concentrations
RESUMO
Present study reports the rheological characteristics of slurries of mixture of fly ash and bottom ash slurry at high concentrations (above Cw ≈ 60 % by weight) with and without additive. The ratio of fly ash and bottom ash is kept at 4:1. Mixture of Sodium Carbonate and Henko detergent has been used as the additive. Rheological tests on slurries (with and without additive) were carried out in a Weissenberg Rheogoniometer with concentric cylinder platens. The variation of shear stress τ with shear rate γ shows that the mixture of fly ash and bottom ash slurries above a solid concentration of 40 % by weight show non-Newtonian behavior and that the experimental data fits a simple Bingham plastic model. Addition of additive results in a significant decrease in the yield stress and Bingham viscosity at all concentrations tested.