AI Article Synopsis
- The coarse aggregate-mortar interface transition zone (ITZ) significantly affects concrete's mechanical properties, but studying it is challenging due to mesoscale limitations.
- A series of axial compression tests were performed using the discrete element method (DEM) to analyze the ITZ's impact on concrete specimens, focusing on four phases: coarse aggregates, mortars, ITZ, and voids.
- Results indicated that higher ITZ strength leads to increased compressive strength in concrete, fewer cracks, reduced anisotropy of contact orientation, and a variation in crack development and damage modes in compressed specimens.
Article Abstract
The coarse aggregate-mortar interface transition zone (ITZ) has a great influence on the mechanical properties of concrete, which cannot be easily studied using laboratory tests in the mesoscale. In this paper, a series of axial compression tests were conducted using the discrete element method (DEM) on concrete specimens for four phases: coarse aggregates, mortars, aggregate-mortar interface transition zones, and voids. The effects of ITZ strength on macroscopic stress and microscopic cracks under different strength reduction factors were investigated through axial compression testing. With the increase in interface transition strength, the compressive strength of the concrete becomes stronger; moreover, the number of cracks decreases, and the anisotropy of contact orientation becomes weaker. Meanwhile, the direction of crack development and the damage mode of compressed concrete specimens were also dependent on the coarse aggregate-mortar interface strength coefficient.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9781332 | PMC |
| http://dx.doi.org/10.3390/ma15248840 | DOI Listing |
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Article Synopsis
- The coarse aggregate-mortar interface transition zone (ITZ) significantly affects concrete's mechanical properties, but studying it is challenging due to mesoscale limitations.
- A series of axial compression tests were performed using the discrete element method (DEM) to analyze the ITZ's impact on concrete specimens, focusing on four phases: coarse aggregates, mortars, ITZ, and voids.
- Results indicated that higher ITZ strength leads to increased compressive strength in concrete, fewer cracks, reduced anisotropy of contact orientation, and a variation in crack development and damage modes in compressed specimens.
Fracture Behaviour of Real Coarse Aggregate Distributed Concrete under Uniaxial Compressive Load Based on Cohesive Zone Model.
Materials (Basel)
August 2021
Department of Building Engineering, School of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China.
Two-dimensional meso-scale finite element models with real aggregates are developed using images obtained by digital image processing to simulate crack propagation processes in concrete under uniaxial compression loading. The finite element model is regarded as a three-phase composite material composed of aggregate, mortar matrix and interface transition zone (ITZ). Cohesive elements with traction-separation laws are used to simulate complex nonlinear fracture.
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