1 State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China 2 Jinan Rail Transit Group Co., Ltd., Jinan 250014, China 3 School of Qilu Transportation, Shandong University, Jinan 250002, China
Abstract: The geometry information of actual aggregates can be obtained by laser scanner to build an aggregate library. Then based on the idea of ‘dot matrix' a new random aggregate placement algorithm is proposed, so that a 3D mesoscopic concrete model can be generated, which can truly reflect the shape, distribution and gradation of aggregates in concrete. Simplified 2D plane geometry model was conveniently obtained by cutting the 3D geometry model. The sections of pebble concrete with aggregate content of 40% and gravel concrete with aggregate content of 30%, 40% and 50% were made, and the roughness, roundness and elongation ratio of the aggregates in the sections were statistically analyzed. A script was written using Python to import 2D plane geometry information into ABAQUS for meshing. And a 2D finite element model of meso-concrete can be obtained. Combined with the laboratory experiments, the influence of aggregate type and aggregate content on the failure mechanism of concrete was studied by the finite element method with the cohesive zone model, under uniaxial compressions. Moreover, this method is also effective to study the mesoscale model of materials with random distribution characteristics such as soil-rock mixtures and conglomerates.
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2023, Vol. 37 
