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The plasticity index (PI) is a measure of the plasticity of soil, specifically indicative of the range of moisture contents over which the soil behaves plastically. For sand, which typically has little to no plasticity, the plasticity index is usually zero or very close to it. This is because sand particles do not adhere to each other when wet, unlike clay, which can swell and shrink significantly with moisture changes. Consequently, sands are generally classified as non-plastic.

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