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Open AccessArticle

Meso-Scale Simulation of Concrete Uniaxial Behavior Based on Numerical Modeling of CT Images

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State Key Laboratory of Geomechanics and Geotechnical Engineering Institute Rock Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
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Hebei Province Key Lab of Structural Health Monitoring and Control, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
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Geotechnical and Structural Engineering Research Center, Shandong University, Jinan 250061, Shandong, China
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Key Laboratory of Transportation Tunnel Engineering of Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China
*
Author to whom correspondence should be addressed.
Materials 2019, 12(20), 3403; https://doi.org/10.3390/ma12203403
Received: 16 September 2019 / Revised: 14 October 2019 / Accepted: 16 October 2019 / Published: 17 October 2019
It is important to study the failure mechanism of concrete by observing the crack expansion and capturing key structures at the mesoscale. This manuscript proposed a method for efficiently identifying aggregate boundary information by X-ray computed tomography technology (CT) and a discrete element modeling method (DEM) for equivalent random polygon aggregates. This method overcomes the shortcomings of the Grain Based Model (GBM) which is impossible to establish a mesoscopic model with a large difference in grain radius. Through the above two methods, the CT slice images were processed in batches, and the numbers of edges, axial length, elongation of the aggregate were identified. The feasibility of the method was verified by the comparison between experimental and simulating results. Three mesoscopic models for different porosities were established. Based on aggregate statistics, this manuscript achieved the meso-model recovery to the maximum extent. The test results show that the crack appeared at the tip of the aggregate firstly, and then the broken boundary was applied in the direction of the applied load and around the pores. Finally, the crack was selectively expanded under the axial force. During the loading process, the minor principal stress was normally distributed. As the porosity and loading time increased, the heterogeneity increased. View Full-Text
Keywords: aggregate boundary; CT; grain based model aggregate boundary; CT; grain based model
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MDPI and ACS Style

Sun, H.; Gao, Y.; Zheng, X.; Chen, Y.; Jiang, Z.; Zhang, Z. Meso-Scale Simulation of Concrete Uniaxial Behavior Based on Numerical Modeling of CT Images. Materials 2019, 12, 3403.

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