Step-by-Step Transition from Clay to Soil Shrinkage ... - Bentham Open
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Step-by-Step Transition from Clay to Soil Shrinkage ... - Bentham Open
Jul 20, 2008 - dried clay volume, vz (the vs and vz values are connected with clay type, see [23, 24]) and is in agreement with data from. [21]. Assumption 2.
The Open Mechanics Journal, 2008, 2, 77-88
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Open Access
Step-by-Step Transition from Clay to Soil Shrinkage Curve V.Y. Chertkov* Agricultural Engineering Division, Faculty of Civil and Environmental Engineering, Technion, Haifa 32000, Israel Abstract: Clay and soil containing it have shrinkage curves that are qualitatively different in shape. The objective of this work is to qualitatively show with maximum simplicity, how a clay shrinkage curve turns into a soil shrinkage curve. Because of the crack volume the measured shrinkage curve is not the single-valued feature of a soil. We use a concept of the reference shrinkage curve that is only stipulated by soil shrinkage without cracking, single-valued, and qualitatively similar to an observed shrinkage curve. We also use new concepts of an intra-aggregate soil structure: (i) a deformable, but non-shrinking surface layer of aggregates that loses water during shrinkage; and (ii) lacunar pores (micro-cracks) inside an intra-aggregate clay that increase in volume during shrinkage. Then, through a series of consecutive steps, illustrating each step by a separate graphic presentation, we move from a clay shrinkage curve to a soil shrinkage curve with predicted qualitative features that coincide with those experimentally observed in numerous soil shrinkage publications. We thereby demonstrate the qualitative physical impact of the intra-aggregate structure on soil shrinkage.
