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Title: Simulation on Compressive Property of Concrete with Large-Size Recycled Coarse Aggregate

Author(s): Tan Li and Jianzhuang Xiao

Publication: Materials Journal

Volume: 117

Issue: 5

Appears on pages(s): 159-168

Keywords: compression; cracking pattern; discrete element method (DEM); large-size recycled coarse aggregate (LRCA); 2-D particle flow code (PFC2D); recycled concrete

Date: 9/1/2020

Abstract:
The uniaxial compression behavior of concrete with 0.98 to 3.15 in. (25 to 80 mm) large-size recycled coarse aggregate (LRCA) was numerically studied. Most of the errors between results of experimental and numerical simulation are within 5 to 10%. The finite element method was used to compare with the discrete element method (DEM). The results show that with a higher replacement rate of LRCA, the DEM has higher accuracy. Failure image of models shows that when the strength of LRCA is lower, the influence of LRCA content is more obvious to cracking patterns of concrete. Kinetic curves show that the cracking resistance of concrete with LRCA is lower than normal concrete and the logarithm of the box-counting dimension has a good linear relationship with the replacement of LRCA, which shows that cracks in the concrete with LRCA have obvious fractal features.




  

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