Stabilization of organic soils with cement is an efficient method to improve their mechanical properties such as resistance to compression. To evaluate the influence of organic matter on compressibility for a soil treated with cement, an experimental study was conducted. One-dimensional compression tests were performed on an organic soil treated with cement. To appeciate the influence of organic matter, additional tests were realized with specimens containing different organic matter contents. Also, as the nature of the organic matter present in a soil influences the cement setting and development, mixtures were prepared using inorganic soils in which different organic compounds were added. The results indicate that the preconsolidation pressure of organic soils increases with addition of cement, and that organic matter increases the compressibility of treated soils but in a less important way than for untreated ones. Also, it is shown that only some organic compounds affect the cementing process, and consequently the strength gain.
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