clay - 53:030 Class Notes; C.C. Swan, University of Iowa...

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Period #3: Particle Characteristics and Size Effects A. Motivation: In the presence of water, some clay soils in pure form can greatly increase in volume (expand, or swell). When water is removed from a clay soil (by drying), the volume can be significantly reduced due to shrinkage. This leads to widespread cracking in the soil. In pure form, the most active clay soils can increase or decrease in volume by a factor of over 15! But since pure clays rarely exist naturally, most soils are not nearly that expansive or active. Nevertheless, active clay soils can potentially wreak havoc on engineered structures by expanding and shrinking somewhat. Visualization: In the laboratory: In this class period, we will begin to explore why clays expand and shrink. 1 dry clay soil saturated clay soil Note the expansion of the clay soil with the introduction of water. 53:030 Class Notes; C.C. Swan, University of Iowa
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The expansive and contractive characteristics of clay soils raise some fundamental questions: ( i) What is the nature of clay particles?
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This note was uploaded on 11/10/2010 for the course CIVIL 53:30 taught by Professor Swan during the Fall '09 term at University of Iowa.

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clay - 53:030 Class Notes; C.C. Swan, University of Iowa...

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