Discrete element modeling of cemented recycled concrete aggregates under unconfined and k0 loading conditions

Mohammadinia, Alireza; Oskooei, Parisa Rahimzadeh; Arulrajah, Arul

doi:10.1016/j.trgeo.2020.100450

Cited by 13 publications

(3 citation statements)

References 39 publications

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“…One is to simplify the cement mortar into an aggregate of spherical particles and consider its bonding through a parallel bonding contact model [ 17 , 18 ]. The second is to simulate cohesion by generating cement particle bonding with sand particles [ 19 ].Considering that the size of sand used in the test is small, the simulation efficiency using the second method is extremely low; thus, the first method is used in this simulation. In order to make the numerical model generate enough contact to ensure particle bonding, the matrix porosity is 4 %.…”

Section: Simulated Testmentioning

confidence: 99%

Discrete Element Study on Bending Resistance of Geogrid Reinforced Cement-Treated Sand

2023

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Cement-treated sand reinforced with geogrids (CTSGs) has higher bending resistance and toughness than cement-treated sands (CTSs). To explore the reinforcement mechanism of geogrids with different stiffness and layers on CTSGs, three-point bending tests and numerical tests based on DEM are carried out on CTS specimens and CTSG specimens considering different reinforcement conditions. The results show that the geogrids and cement-treated sands have good cooperative working performance. Compared with CTSs, CTSG specimens show better ductility, flexural strength and toughness. The increase in geogrid stiffness and geogrid layers promote the reinforcement effect. On the meso-level, different geogrid stiffness and layers affect the crack propagation speed and distributions of cracks due to the anchorage action of geogrids, resulting in different reinforcement effects. In addition, the layers and stiffness of geogrids affect the evolution of the internal force chains of CTSG specimens. Both the increase in geogrid layers and decrease in geogrid stiffness reduce the average internal force of geogrids and weaken the anisotropy of the normal contact force of the specimens. The simulation results interpret the reinforcement mechanism of a CTSG specimen from crack development and internal force evolution, which can support a mesoscopic supplement to laboratory tests.

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Section: Simulated Testmentioning

confidence: 99%

Discrete Element Study on Bending Resistance of Geogrid Reinforced Cement-Treated Sand

2023

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“…In this study, the numerical simulation was carried out based on the particle flow program PFC3D developed by DEM. In PFC3D, particles with a finite mass interact through internal forces and moments, and the motion of particles follows Newton's second law [35]. The contact constitutive of steam-cured RAC adopted the linear parallel bonding model, in which the bonding between two contacting particles is highly similar to the mechanical behavior of cement-based materials [36].…”

Section: Numerical Modelmentioning

confidence: 99%

Experimental and Numerical Investigation on the Triaxial Compressive Behavior of Steamed Recycled Aggregate Concrete

et al. 2023

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The use of recycled aggregates to produce precast concrete products is conductive to the green development of construction industrialization. This paper aimed to study the effects of curing regimes and confining pressures on the triaxial compression behavior of recycled aggregate concrete (RAC). Triaxial compression tests were carried out on RAC under different curing regimes (standard curing, 60 °C—12 h and 80 °C—9 h), and the designed confining pressures were 0 MPa, 2.5 MPa, 5 MPa, and 10 MPa. The results show that the increase of confining pressure limits the expansion of cracks, causing the failure mode to change from vertical splitting to oblique shearing, and the triaxial compressive strength is doubled at most. Compared with standard curing, steam curing significantly weakened the triaxial compressive strength of RAC, which was related to the reduction of RAC cohesion, and the cohesion of RAC steam cured at 80 °C was reduced by 30%. The triaxial compression failure of RAC closely follows the Mohr–Coulomb criterion. Based on the discrete element method and test results, an RAC triaxial compression numerical model considering the shape of the actual coarse aggregate was established, and the propagation of cracks was discussed at the mesoscopic level.

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“…Alternatively, discrete element modeling (DEM) is a computational approach used for solving mathematical problems related to the material having discrete characteristics, such as granular material or many other geomaterials such as soils, rocks, and aggregates [88][89][90]. While continuum models concentrate on constitutive rules, DEM concentrates on interaction laws [91].…”

Section: Use Of Discrete Element Approachmentioning

confidence: 99%

A Critical Review on the Performance of Pile-Supported Rail Embankments under Cyclic Loading: Numerical Modeling Approach

et al. 2021

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Searching for economical and practical solutions to increase any transport substructure’s protection and stability is critical for ensuring the long-term viability and adequate load-bearing capacity. Piles are increasingly being used as an economical and environmentally sustainable solution to enhance the strength of soft subgrade soils on which embankments are raised. As per the available literature, there are two main strategies used to explain railway embankments’ performance: experimental approaches and numerical simulations on a broad scale. The purpose of this study is to examine the state-of-the-art literature on numerical modeling methods adopted to assess the performance of pile-supported rail embankments subjected to cyclic loading. The paper addresses the main results from various numerical methods to explain the appropriate mechanisms associated with the load deformation response. It also presents the key issues and drawbacks of these numerical methods concerning rail embankment development while outlining the specific shortcomings and research gaps relevant to enhanced future design and analysis.

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Discrete element modeling of cemented recycled concrete aggregates under unconfined and k0 loading conditions

Cited by 13 publications

References 39 publications

Discrete Element Study on Bending Resistance of Geogrid Reinforced Cement-Treated Sand

Discrete Element Study on Bending Resistance of Geogrid Reinforced Cement-Treated Sand

Experimental and Numerical Investigation on the Triaxial Compressive Behavior of Steamed Recycled Aggregate Concrete

A Critical Review on the Performance of Pile-Supported Rail Embankments under Cyclic Loading: Numerical Modeling Approach

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