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Alternative Title:Characteristics and engineering properties of the soft soil layer at the top of highway subgrades.
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Abstract:A field laboratory investigation was performed to determine why excessive swelling was occurring on a pavement section of KY Route 499 that was about four years old. Swelling occurred on a section of roadway that had been constructed with a hydrated lime-stabilized subgrade. As shown by laboratory swell tests, swelling of the pavement was due to the absorption of water and expansion of the compacted clay shale subgrade. Results of laboratory swell tests showed that the hydrated lime, and sulfates, which were present in small amounts did not contribute to swell.
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