A holistic computational model for prediction of clay suspension structure |
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| Authors: | Yuan Guo Xiong |
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| Institution: | 1. Department of Civil Engineering, Case Western Reserve University, 2104 Adelbert Road, Bingham 269, Cleveland, OH 44106-7201, United States;2. Department of Civil Engineering, Case Western Reserve University, 2104 Adelbert Road, Bingham 206, Cleveland, OH 44106-7201, United States;1. Faculty of Geology, VNU University of Science, Vietnam National University, Hanoi 334 Nguyen Trai, Thanh Xuan, Hanoi, Viet Nam;2. Faculty of Marine and Coastal Engineering, Thuyloi University, 175 Tay Son, Dong Da, Hanoi, Vietnam;3. SedTrend Analysis Limited, 7236 Peden Lane, Brentwood Bay, BC, Canada V8M1C5;4. Faculty of Meteorology, Hydrology and Oceanography, VNU University of Science, Vietnam National University, Hanoi, 334 Nguyen Trai, Thanh Xuan, Hanoi, Vietnam;1. Department of Civil and Environmental Engineering, University of California, Davis, 2001 Ghausi Hall, One Shields Ave., Davis, CA 95616, United States;2. Facultad de Ingeniería y Ciencias Aplicadas, Universidad de los Andes, Monseñor Alvaro del Portillo 12455, Las Condes, Santiago, Chile;3. Department of Civil Engineering, Universidad Andres Bello, Santiago 8320000, Chile;1. West Virginia University, Davis College of Agriculture Natural Resources and Design, United States;2. School of Natural Resources, Energy Land Management, United States;3. Division of Plant and Soil Sciences, Environmental Soil Chemistry and Soil Fertility, United States;4. School of Natural Resources Appalachian Hardwood Center at West Virginia University, Morgantown, WV, United States;1. College of Water Sciences, Beijing Normal University, Beijing 100875, PR China;2. Engineering Research Center of Groundwater Pollution Control and Remediation, Ministry of Education, Beijing 100875, PR China;3. National Geomatics Center of China, Beijing 100830, PR China;1. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China;2. Southwest University of Science and Technology, 59 Qinglong Road, Mianyang 621010, Sichuan, China |
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| Abstract: | The formation of clay suspensions involves complex interactions among clay particles subjected to the geochemical environment during the sedimentation process. The structural characteristics have a major influence on the physical and mechanical behavior of the suspension. A modeling framework involving a Discrete Element Method(DEM) model with customized particle mechanical interactions is proposed in this paper for the holistic prediction of the physical structure of clay suspensions. The particle interaction force model is based on the Derjaguin, Landau, Verwey, and Overbeek(DLVO) theory that accounts for electrostatic repulsion, van der Waals attraction, contact repulsion, etc. Kaolinite is used as the model clay to demonstrate the model performance. The surface charge density of kaolinite is obtained through Atomic Force Microscope(AFM) force measurement and is implemented in the particle interaction force model in the subsequent simulations. Influencing factors, such as centrifugal acceleration, ionic concentration, platy structure of particles, and particle size, on the formation of kaolinite suspensions are studied with the numerical model and compare favorably well with the experimental data. This work lays down a unique framework consisting of computational modeling and microscale characterization of clay particles to holistically predict the characteristics of clay suspensions, which paves the basis to model and predict their bulk physical and mechanical behavior. |
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| Keywords: | Clay suspension Discrete element method DLVO theory Atomic force microscope Kaolinite Surface potential |
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