Simulation Of The Behaviour Of Fully-graded Concrete At A Mesoscopic Level Based On A Rigid Body Spring Discrete Element Model
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Y.-P. Song, H.-L. Wang & B.-T. Wang
In this paper, the behaviour of the four-graded concrete is analyzed using the mesoscopic approach which treats the concrete as a three-phase system consisting of a cement mortar continuous phase, a coarse aggregate dispersed phase, and the interface transition zone (ITZ) - an interfacial zone between cement mortar and coarse aggregates. First, according to the aggregate grading curve of fully-graded concrete and Walraven function, a random aggregate structure is generated in which the shape, size and distribution of the aggregate particles resemble real concrete in the statistical sense. Then, based on the rigid body-spring discrete element model, this paper presents a procedure for mesoscopic study behaviour of four-graded concrete under the two-dimensional stress state. At last, the proposed numerical method is validated to simulate some routine tests of concrete carried out in the laboratory (which includes uniaxial compressive and tensile test and biaxial tensile-compressive test of four-graded concrete) and it proves that this method could effectively describe the failure behaviour of concrete under various plane stress state. Keywords: four-graded concrete, mesoscopic structure, random aggregate, rigid body spring model (RBSM), strength. 1 Introduction For various purposes, in massive concrete structures such as the concrete dam、water gate、dock、harbor construction、nuclear power plant, people
four-graded concrete, mesoscopic structure, random aggregate, rigid body spring model (RBSM), strength.