Closure to 'Cement, Lime, and Fly Ashes in Stabilizing Expansive Soils: Performance Evaluation and Comparison' by Masrur Mahedi,Bora Cetin, and David J. White

摘要

The original paper evaluated the performance of lime, cement, Class C fly ash, Class C fly ash-cement, and Class F fly ash-cement stabilized expansive soils based on the laboratory experiments. Compressive strength, swelling, Atterberg limits, pH, and impact of sulfate salts were evaluated for 33 different soil-stabilizer blends. Results showed that higher initial compressive strength could be achieved by cement treatment, whereas lime performed better in terms of ultimate strength development. Despite the higher ultimate compressive strength of lime treatment, the swelling of expansive soil was not adequately suppressed. The presence of sulfate salts in expansive soils impaired the performance of the stabilizers. In treating high-sulfate expansive soils, fly ash-cement blends performed better compared to cement and lime treatments alone.