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Influence of Starch Polysaccharide on the Remolded Properties of 2 Indian clay Samples

Rao, SM and Sridharan, A and Shenoy, MR (1993) Influence of Starch Polysaccharide on the Remolded Properties of 2 Indian clay Samples. In: Canadian Geotechnical Journal / Revue canadienne de géotechnique, 30 (3). pp. 550-553.

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The reported presence in marine clays and the recognized role of polysaccharide as a bonding agent provided the motivation to examine the role of starch polysaccharide in the remoulded properties of nonswelling (kaolinite) and swelling (bentonite) groups of clays. The starch polysaccharide belongs to a group of naturally occurring, large-sized organic molecules (termed polymers) and is built up by extensive repetition of simple chemical units called repeat units. The results of the study indicate that the impact of the starch polysaccharide on the remoulded properties of clays is dependent on the mineralogy of the clays. On addition to bentonite clay, the immensely large number of segments (repeat units) of the starch polysaccharide create several polymer segment - clay surface bonds that cause extensive aggregation of the bentonite units layers. The aggregation of the bentonite unit layers greatly curtails the available surface area of the clay mineral for diffuse ion layer formation. The reduction in diffuse ion layer thickness markedly lowers the consistency limits and vane shear strength of the bentonite clay. On addition to kaolinite, the numerous polymer segment - clay surface bonds enhance the tendency of the kaolinite particles to flocculate. The enhanced particle flocculation is responsible apparently for a small to moderate increase in the liquid limit and remoulded undrained strength of the nonswelling clay.

Item Type: Editorials/Short Communications
Publication: Canadian Geotechnical Journal / Revue canadienne de géotechnique
Publisher: NRC Research Press
Additional Information: Copyright of this article belongs to NRC Research Press.
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Date Deposited: 10 Feb 2011 08:46
Last Modified: 10 Feb 2011 08:46
URI: http://eprints.iisc.ac.in/id/eprint/35504

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