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Influence of CaCl2 on Compaction and CBR Characteristics of Gypsum (CaSO4·2H2O) Stabilized High Plastic Clay
Lightweight structures that are constructed on clay would experience the uplift and settlement due to changes in moisture content. Soil with high plasticity could cause problems to the structures. Good numbers of options are available to stabilize the highly plastic clays. One such option in the recent past is the utilization of gypsum in soil stabilization. Gypsum can be derived from demolished building sites as waste. This paper presents the behavior of clay stabilized with gypsum, and also the effect of CaCl2 on the improvement of CBR and shear characteristics. The tests such as of standard compaction, California Bearing Ratio (CBR), free swell index (FSI), and direct shear are conducted. The proportions of gypsum used in the study are 0, 2, 4, 6, and 8% by dry weight of soil. A 2% CaCl2 is added to the clay which is stabilized at 6% gypsum in order to see the improvement in soil behavior. The results revealed that as % gypsum increases from 0 to 8%; initially, there was an increase in the maximum dry density (MDD) up to 4% gypsum content, and thereafter, it showed little decrease in MDD. The CBR of high plastic clay stabilized with gypsum showed marginal improvement. Free swell index of gypsum treated clay is reduced to almost 50% at 8% gypsum. For the gypsum stabilized clay when 2% CaCl2 is added, resulted in a further increase in CBR and MDD. The 6% gypsum and 2% CaCl2 addition to the high plastic clay resulted in improvement in strength and CBR values.
Influence of CaCl2 on Compaction and CBR Characteristics of Gypsum (CaSO4·2H2O) Stabilized High Plastic Clay
Lightweight structures that are constructed on clay would experience the uplift and settlement due to changes in moisture content. Soil with high plasticity could cause problems to the structures. Good numbers of options are available to stabilize the highly plastic clays. One such option in the recent past is the utilization of gypsum in soil stabilization. Gypsum can be derived from demolished building sites as waste. This paper presents the behavior of clay stabilized with gypsum, and also the effect of CaCl2 on the improvement of CBR and shear characteristics. The tests such as of standard compaction, California Bearing Ratio (CBR), free swell index (FSI), and direct shear are conducted. The proportions of gypsum used in the study are 0, 2, 4, 6, and 8% by dry weight of soil. A 2% CaCl2 is added to the clay which is stabilized at 6% gypsum in order to see the improvement in soil behavior. The results revealed that as % gypsum increases from 0 to 8%; initially, there was an increase in the maximum dry density (MDD) up to 4% gypsum content, and thereafter, it showed little decrease in MDD. The CBR of high plastic clay stabilized with gypsum showed marginal improvement. Free swell index of gypsum treated clay is reduced to almost 50% at 8% gypsum. For the gypsum stabilized clay when 2% CaCl2 is added, resulted in a further increase in CBR and MDD. The 6% gypsum and 2% CaCl2 addition to the high plastic clay resulted in improvement in strength and CBR values.
Influence of CaCl2 on Compaction and CBR Characteristics of Gypsum (CaSO4·2H2O) Stabilized High Plastic Clay
Lecture Notes in Civil Engineering
Satyanarayana Reddy, C. N. V. (editor) / Muthukkumaran, K. (editor) / Satyam, Neelima (editor) / Vaidya, Ravikiran (editor) / Ramanjaneyulu, Batchu (author) / Kumar, Nandyala Darga (author)
2021-09-27
10 pages
Article/Chapter (Book)
Electronic Resource
English
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