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Simulating macroscopic behavior of self-compacting mixtures with DEM
Affiliation:1. Microlab, Faculty of Civil Engineering and Geosciences, Delft University of Technology, 2628 CN Delft, The Netherlands;2. Department of Civil Engineering, COPPE-UFRJ, Rio de Janeiro, Brazil;1. Iowa State University;2. Northwestern University;3. Missouri University of Science and Technology;1. Virginia Tech Transportation Institute, Blacksburg, VA, USA;2. The Via Department of Civil and Environmental Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA;3. Virginia Center for Transportation Innovation and Research, Charlottesville, VA, USA;1. College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China;2. Army Engineering University of PLA, Xuzhou 221004, China;1. Department of Infrastructure Engineering, The University of Melbourne, VIC 3010, Australia;2. Department of Civil Engineering, Monash University, Melbourne, VIC 3800, Australia;1. Department of Construction Engineering, Universidade Federal do Paraná, ACF Centro Politécnico, Bloco III, Jardim das Américas, 81531-980 Curitiba, PR, Brazil;2. Department of Construction Engineering, Universitat Politècnica de Catalunya, C/Jordi Girona 31 C1, 08034 Barcelona, Spain;3. Smart Engineering, C/Jordi Girona 1-3 K2M 202c, 08034 Barcelona, Spain;4. Department of Construction Engineering, Universidade Estadual de Londrina, Rodovia Celso Garcia Cid, Pr 445 Km 380, Campus Universitário, 86051-980 Londrina, PR, Brazil
Abstract:Development of proper rheological models and suitable numerical methods are necessary for a thorough understanding of the basic flow properties of fresh mortar or concrete. Main challenge for models is to find a quantitative correlation between the model parameters and the properties and proportions of the mix ingredients. This paper presents a modeling approach for the rheological behavior of fresh self-compacting mixtures using a Discrete Element Method (DEM). The employed method is based on a conceptual idea where the grain-paste-grain interactions are explicitly described as an interactive two-phase paste-bridge system. Each mixture is considered to be an assembly of mutually interacting “grain-paste-grain” systems which can be characterized according to the mix composition with help of the “excess paste theory”. Macroscopic slump flow predictions are evaluated by laboratory tests. Simulations and experimental test results show good agreement.
Keywords:Discrete Element Method (DEM)  Flow analysis  Self-compacting mixture  Slump flow test  Excess paste theory  Two-phase element
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