Swell-shrink and strength behaviors of lime and cement stabilized expansive organic clays |
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| Affiliation: | 1. Department of Civil Engineering, Indian Institute of Technology Hyderabad, Yeddumailaram — 502 205, India;2. Department of Civil Engineering, The University of Texas at Arlington, TX 76019, United States;1. Faculty of Engineering, Bu-Ali Sina University (BASU), Hamedan, Iran;2. McGill University, Montreal, Canada;3. School of Civil Eng., Faculty of Engineering, University of Tehran, Tehran, Iran;1. Centre de Recherche sur la Matière Divisée, CRMD and Laboratoire PRISME, Université d''Orléans, France;2. Mosul University, College of Engineering, Civil Engineering Department, Al-Majmooah Street, Mosul, Iraq;1. Research Center on Divided Matter – CRMD, FRE CNRS 3520 1b rue de la Férollerie, 45100 Orléans Cedex 2, France;2. Civil Engineering Department, College of Engineering, Mosul University, Iraq;1. Department of Engineering, High Politechnic College, University of Almería, La Cañada de San Urbano s/n, 04120 Almería, Spain;2. Department of Civil, Structural and Environmental Engineering, Trinity College Dublin, Dublin, Ireland;3. Institute of Materials Science of Sevilla (ICMS), Joint Center of the Spanish National Research Council (CSIC) and University of Sevilla (US), c/Américo Vespucio 49, 41092-Sevilla, Spain |
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| Abstract: | Organic soils are mostly composed of decayed plant matter and weathered rock material. Often, these soils are known for their inferior engineering behavior including very high compressibility and low shear strength. In order to improve these properties, organic soils are, by and large, modified with calcium based stabilizers such as lime, cement and fly ash. However, transportation agencies in the United States have mentioned that the anticipated improvements were never achieved or the improvement obtained disappeared quickly with time. Therefore, a research study was initiated to understand the behavioral mechanisms of lime and cement stabilized organic soils. Eight natural expansive soils bearing different organic contents (varying between 2 and 6%) were selected for the present investigation. First, optimum dosages of lime and cement were determined for the selected soils. Then treated and untreated (control) specimens were prepared to study their physical and engineering behaviors of the soil specimens at varied curing periods. There is a drastic increase in unconfined compressive strength (UCS) of lime and cement treated specimens until 28 days of curing. Beyond which, a negligible improvement in UCS property was recorded for lime treated specimens and a slight decrease in UCS for cement treated soils was noticed. This reduction in strength for cement treated specimens could be attributed to the reduction in pH concentration with curing as well as the formation of inorganic calcium humic acid at this stage. |
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