The Effect of Adding Calcined Clay on Some Geotechnical Properties of Clayey Soil Stabilized By Lime
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Researchers |
Dr. Ibraheem HAMOOD - Dr. Aref ALSWIDANI - Eng. Ayman MEZIAB |
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Published in |
Al-Baath Magazine for Engineering Sciences, Al-Baath University, Volume 40, Issue 7, 2018 |
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Abstract |
Calcined clay was obtained by thermal treatment of the clayey soil used in this study, levels of temperature ranging from (450, 650, 850°C) were studied for 3hours to be stabilized by lime. Pozzolanic activity of thermally treated soil samples, were determined using Chapelle test modified at each level. Combinations of clayey soil, lime and calcined clay selected according to the best result obtained from Chapelle test, were prepared. A constant content of lime (6%), measured as a percent of the dry soil mass was added. while the calcined clay ranged from (0%) to (20%). The experimental parts included compression test in standard proctor mould, Atterberg limits, free swelling and pressure of swelling in oedometer ring, linear shrinkage. the optimum moisture content and maximum dry density were obtained and the test results showed an improvement in consistency properties with a decrease in plasticity index with increase of calcined clay percentage added to the clayey soil. Values of free swelling decreased from (7.4%) to (1.2%), pressure of swelling decreased from (80KPa) to (10KPa) and linear shrinkage decreased from (16.7%) to (2.4%), all of that at the combination 6% lime, 20% calcined clay. that was a clear indicator to the improvement that took place in the clayey soil treated by calcined clay and lime. Key words: Calcined clay, lime, plasticity index, free swelling, pressure of swelling, linear shrinkage. |
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