Meso-scale modelling of compressive fracture in concrete with irregularly shaped aggregates

Naderi, Sadjad; Tu, Wenlin; Zhang, Mingzhong

doi:10.1016/j.cemconres.2020.106317

Cited by 124 publications

(22 citation statements)

References 63 publications

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“…It is worth mentioning that in a relevant study to the current one, the effect of aggregate shape on the uniaxial compressive fracture behaviour of concrete was investigated using the concrete damage plasticity (CDP) method [69]. It can be considered as complementary to this work.…”

Section: Discussionmentioning

confidence: 99%

Meso-scale modelling of static and dynamic tensile fracture of concrete accounting for real-shape aggregates

Naderi

Zhang

2021

Cement and Concrete Composites

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Section: Discussionmentioning

confidence: 99%

Meso-scale modelling of static and dynamic tensile fracture of concrete accounting for real-shape aggregates

Naderi

Zhang

2021

Cement and Concrete Composites

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“…The two-grade concrete was adopted and the aggregates were modelled as assemblies of elements approximating spheres. Referring to the works (Jin et al., 2021; Naderi et al., 2021), the aggregate volume fraction of specimens was set at 35%. It is the high computational cost to model those ITZ elements with actual sizes of 20 ∼ 50 μm (Scrivener et al., 2004).…”

Section: Meso-scale Numerical Modelmentioning

confidence: 99%

Combined effects of cryogenic temperature and strain rates on compressive behavior of concrete

Jin

Liu

Zhang

et al. 2022

International Journal of Damage Mechanics

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Concrete structures in extremely cryogenic environments may be subject to dynamic loadings as a result of occasional accidents or terrorist attacks during the service life. Considering the cryogenic temperature effect and strain rate effect of each phase for concrete, a meso-scale numerical model of the concrete subjected to cryogenic temperature and dynamic loadings was presented in this study, which serves as a preliminary foundation for calculating and evaluating the performances of concrete structures at cryogenic temperature. Taking concrete cube as an example, the dynamic compressive behavior and strain rate effect of concrete specimens at cryogenic temperature from 20 °C to –160 °C were modelled and investigated. The numerical results indicate that the failure appearances and compressive strength are highly related to the cryogenic temperature and dynamic loadings. The compressive strength at cryogenic temperature is greater than that at ambient temperature, and the sensitivity of dynamic compressive strength to strain rate is enhanced at cryogenic temperature. Moreover, the absorbed energy and dynamic elastic modulus tend to increase with the decrease of temperature and increase of strain rate. According to the numerical results, an empirical formula on dynamic increase factor of compressive strength at cryogenic temperatures (CDIF T) was established.

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“…The existing meso-scale concrete research findings show that aggregate generally does not crack (Unger and Eckardt, 2011;Wang et al, 2020;Naderi et al, 2021). In this study, an elastic model was used to characterize the mechanical behavior of aggregate, and the aggregate parameters were selected with reference to .…”

Section: Constitutive Model and Parameter Determination For Aggregate And Rebarmentioning

confidence: 99%

Meso-scale corrosion expansion cracking of ribbed reinforced concrete based on a 3D random aggregate model

Zhang¹,

Lü²,

Zhu³

et al. 2021

J. Zhejiang Univ. Sci. A

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In reinforced concrete structures, corrosion of the rebar produces 2-6 times more corrosion product than the original material, creating pressure on the surrounding concrete, leading to cracking. The study of corrosion and cracking in reinforced concrete structures is therefore of great importance for enhancing the durability of concrete. Unlike many previous studies, we used ribbed rebar similar to that used commercially and considered the mechanical behavior of the interface transition zone (ITZ) between the aggregate and mortar to simulate the processes of corrosion and cracking of reinforced concrete structures. We explored the failure mode of the interface layer under uniform corrosion and the influence of different factors on the corrosion expansion cracking and the shedding mode of a concrete cover. This was achieved by establishing a three-phase meso-scale model of concrete based on secondary development of ABAQUS, simulating the mechanical behavior of the ITZ using a cohesive element, and establishing a rust expansion cracking model for single and multiple rebars. The results showed that: (1) Under uniform rust expansion, concrete cracks are distributed in a cross pattern with a slightly shorter lower limb. (2) When the corrosion rate is low, the ITZ is not damaged. With an increase in the corrosion rate, the proportion of elements with tensile damage in the ITZ first increases and then decreases. (3) In the case of a single rebar, the larger the cover thickness, the higher the corrosion rate corresponding to ITZ failure, and the arrangement of the rebar has little influence on the ITZ failure mode. (4) In the case of multiple rebars, the concrete cover cracks when the rebar spacing is small, and wedge-shaped spalling occurs when the spacing is large.

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Meso-scale modelling of compressive fracture in concrete with irregularly shaped aggregates

Cited by 124 publications

References 63 publications

Meso-scale modelling of static and dynamic tensile fracture of concrete accounting for real-shape aggregates

Meso-scale modelling of static and dynamic tensile fracture of concrete accounting for real-shape aggregates

Combined effects of cryogenic temperature and strain rates on compressive behavior of concrete

Meso-scale corrosion expansion cracking of ribbed reinforced concrete based on a 3D random aggregate model

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