Resilient Moduli Characterization of Cement-Treated Silt

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4. Resilient Moduli Characterization of Cement-Treated Silt

The design and performance of a flexible pavement depend on the resilient modulus (M_R) of subgrade soil. Thus, M_R is a key design parameter for mechanistic-empirical pavement design of flexible pavements. Generally, the resilient modulus is determined by conducting repeated load triaxial (RLT) tests in the laboratory and has been used to characterize the subgrade soil behavior under repeated traffic loading conditions. The use of cement to stabilize natural subgrade soils is widely accepted by federal and many state highway agencies. Several research studies were conducted on the resilient behavior of cement-treated soils. However, limited research studies have been conducted on the resilient behavior of cement-treated silty soil. Therefore, the current research study assessed the resilient moduli properties of cement-treated silt. Cement-stabilized soil specimens were statically compacted and cured in a humid room for a stipulated curing period before conducting RLT tests. RLT tests were conducted on cement-treated specimens at different cement dosages and curing periods to study the effect of the cement dosage and curing time on the resilient modulus. Test results indicated that a significant improvement in performance was observed after cement treatment. The untreated soil specimens exhibited stress-softening behavior with an increase in deviator stress, whereas the cement-treated specimens exhibited stress-hardening behavior. The resilient modulus was increased with an increase in cement dosage. Statistical regression analyses were conducted on RLT test results using two- and three-parameter models and regression constants were determined. It was observed that the three-parameter model exhibited an excellent fit with experimental data.

8th International Symposium on Deformation Characteristics of Geomaterials (ISDCG2023)

II.6) Soil stabilisation and improvement