基于真实骨料的细观混凝土建模及数值模拟

doi:10.11896/cldb.21080155

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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.

Key words： laser scanning aggregate mesoscale concrete model aggregate placement algorithm cohesive zone model

Published: 25 May 2023 Online: 2023-05-23

CLC number:

TU528

Fund:National Key Research and Development Program of China(2016YFC0600901), the National Natural Science Foundation of China (41172116, U1261212) and the Innovation Fund Research Project of State Key Laboratory for Geomechanics & Deep Underground Engineering (Beijing) (SKLGDUEK202220).

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	Articles by authors
	ZHANG Longfei
	XIE Hao
	FENG Jili
	CHEN Yanwei

Cite this article:

ZHANG Longfei,XIE Hao,FENG Jili, et al. Meso-concrete Modeling and Numerical Simulation Based on Actual Aggregates[J]. Materials Reports, 2023, 37(10): 21080155-8.

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http://www.mater-rep.com/EN/10.11896/cldb.21080155 OR http://www.mater-rep.com/EN/Y2023/V37/I10/21080155

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