Rheological behaviour of bentonite suspension in presence of polyhydric alcohols
01 Jan 1999-Transactions of The Indian Ceramic Society (Indian Ceramic Society)-Vol. 58, Iss: 1, pp 15-18
TL;DR: In this paper, the relative influence of polyhydric alcohols on the flow behavior of bentonite suspension at room temperature was studied at a non-Newtonian region and as such rotational cup and bob viscometer of Mc-Michael type was used.
Abstract: The relative influence of some polyhydric alcohols, differing in their molecular weight, degree of dissociation and complex forming capacities, on the flow behaviour of bentonite suspension has been studied at room temperature. The experiments were conducted in non-Newtonian region and as such rotational cup and bob viscometer of Mc-Michael type was used. The changes in particle interaction and modes of particle association have been evaluated through the measurement of rheological properties such as yield stress and plastic viscosity of the interacted suspension. A significant reduction of plastic viscosity was noticed in all cases with the increase in yield value.
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TL;DR: In this paper, a rotational type viscometer was used to evaluate the rheological properties of common clay, quartz and fly ash suspensions with an ultimate objective of preparing slips with reproducible castability.
Abstract: Utilization of common clay in admixtures with various other substances for fabrication of utility goods and art objects are widely in practice. However, slip casting of slurries of such crude materials poses several problems in shaping of green bodies because of poor reproducibility due to lack of sufficient knowledge on the rheological properties of those suspensions. In the present investigation, suspensions containing common clay, quartz and fly ash have been selected for evaluating rheological properties of those suspensions with an ultimate objective of preparing slips with reproducible castability. Newtonianity of those suspensions were evaluated by rotational type viscometer and an attempt was made to explain the behavior of suspensions in terms of Newtonian factor `n' consistency factor `k' and viscosity V. Different factors responsible for affecting `n', `k' and `ri' were analyzed and their inter relationship established. It was found that the suspensions were of pseudo plastic in nature with a marked tendency towards becoming Newtonian. Rheological parameters like `n', `k' and `ri' were found to be extremely electrolyte sensitive. The entire phenomenon was explained by assuming floc structure and deflocculations were interpreted in terms of electrolytic as well as mechanical forces. Castability of suspension was found to be related to `n', `k' and V.
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TL;DR: In this paper, the Schofield-van Olphen model of particle interactions has been used to elucidate the conditions under which edge-face, edge-edge, and face-face coagulated structures exist.
249 citations
TL;DR: In this paper, the effect of NaCl and pH on the Bingham yield stress of the Na kaolinite samples can be explained in terms of the modes of particle interaction discussed previously in a detailed study of the “Al-free” Na-kaolinite.
53 citations
TL;DR: In this article, the effect of the electrolyte upon the density of packing of particles within flocs and average floc size was investigated and it was suggested that the Bingham yield stress is a more sensitive measure of particle-particle interactions than the sedimentation volume.
45 citations
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