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Suppression of Sulfate Attack on a Stabilized Soil

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A soil containing calcium sulfates was stabilized at 40°C, with ample moisture, by cementitious mixtures producing a range of calcium hydroxide upon hydration. Maximum expansion occurred when the stabilizing agent was lime, whereas a mixture containing portland cement, Class C fly ash, and an amorphous silica stopped the expansion. X-ray diffraction peak width and scanning electron microscopy (SEM) based image analysis showed that maximum expansion correlated with crystallization of colloidal ettringite. Ettringite was seen by SEM within an hour of mixing the soil with lime. Colloidal ettringite was not observed when portland cement, with supplementary cementing materials, was used for stabilization.
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Document Type: Research Article

Affiliations: 1: Louisiana Transportation Research Center, Baton Rouge, Louisiana 70808 2: Center for Advanced Microstructures and Devices, Louisiana State University, Baton Rouge, Louisiana 70806 3: Department of Civil & Environmental Engineering, Louisiana State University, Baton Rouge, Louisiana 70803 4: Department of Physics, Louisiana State University, Baton Rouge, Louisiana 70803

Publication date: 2005-06-01

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