Abstract
The strength and stability of collapsible soils can present problems during construction. To overcome these problems, sulfur cement as a treatment method was developed and evaluated in view of its microstructure, mineralogical composition, physical, thermal, mechanical, hydraulic, and chemical properties. The treated soil was prepared from modified sulfur, sulfur, fly ash, and soil aggregates. Specimens were treated in air, water, and saline solutions at different temperatures, ranging from room temperature to 60°C, and time, ranging from 28 days to one year. After treatment, specimens were tested for their compressive strength. The results indicated that the strength of the treated soil is about three times higher than that stabilized by normal Portland cement. The results of hydraulic conductivity of the treated soils are ranged between 1.46 × 10<sup>-13</sup> and 7.66 × 10<sup>-11</sup> m/s making it a good candidate for its potential use as stabilizing agent in arid lands. Leachability of sulfur and metal ions from the solidified material was below the norms stated by various environmental agencies. The treated soil offers many advantages as an alternative construction material particularly in situations that require a fast solidification in places of extremely cold, hot climates or corrosion conditions.
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