Modeling and predicting the mechanical behavior of concrete under uniaxial loading

Yong, Yu; Zheng, Yu; Xu, Jinjun; Wang, Xiaolu

doi:10.1016/j.conbuildmat.2020.121694

Cited by 20 publications

(17 citation statements)

References 37 publications

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“…LM was chosen to model interactions happening between the concrete specimen and the two load platens, while FLM was adopted to describe interactions among adjacent rigid particles. The reasonableness of choosing these models to simulate the concrete's uniaxial mechanical behaviors has once been verified in our previously-published studies (Yu et al, 2021aYu et al, 2021b.…”

Section: Principles For Mesoscale Demmentioning

confidence: 77%

“…In this study, since NAC and RAC samples are both modeled as two-dimensional 100×100 mm squares, natural, recycled and compensatory aggregates appearing in these samples are assumed as circular for simplicity. Similar with the practices done in modeling works of (Wang et al, 2019(Wang et al, , 2020Yu et al, 2021a), the sizes and contents of coarse NAs and RAs in NAC and conventional RAC samples are supposed to follow the classical Walraven's formulation:…”

Section: Random Aggregate Modelmentioning

confidence: 99%

“…in which P c represents the area percent of coarse particles with a diameter D less than D 0 ; D is the circular aggregate's diameter; P k denotes the fraction of the total area occupied by coarse aggregates (usually 75%, Yu et al, 2021a); and lastly D max is the maximum aggregate size, which keeps as 20 mm as per the calibration experiments of this study.…”

Section: Random Aggregate Modelmentioning

confidence: 99%

“…In equations ( 9)-( 13), ρ denotes the density, and ρ aggregate and ρ mortar are assumed in this study as 2650 and 2100 kg/m 3 in accordance with literature (Yu and Wu, 2019). Values of E * aggregate and A * aggregate are taken as 195.63 MPa and 96.61 GPa (data came from our previous article (Yu et al, 2021a)).…”

Section: Generic Expressions For Estimating Uniaxial Mechanical Prope...mentioning

confidence: 99%

“…After building the RAC’s random aggregate model, a finite element method or discrete element method (DEM) commonly can be used to simulate the mechanical responses of concrete. In this study, the latter technique is adopted since it has been shown in previous literature (Tan et al, 2019; Nitka and Tejchman, 2020; Sinaie et al, 2018) together with our recent investigations (Yu et al, 2021a) that DEM has the following distinct advantages: (a) easy to represent different types of ITZs; (b) handy for explicitly expressing crack’s initialization and development; (c) reasonably simulate concrete’s lateral deformation changes; and (d) superior in describing the concrete material’s mechanical property indexes quantitatively. With using DEM, more recently, Tan et al (Tan et al, 2019) successfully simulated the failure process of Modeled RAC plates under axial compression, and Zhang’s group (2021) innovatively discussed the crushing characters of recycled construction and demolition wastes used in road bases.…”

Section: Introductionmentioning

confidence: 99%

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Uniaxial mechanical behaviors of recycled coarse aggregate concretes cast with conventional and equivalent mortar volume methods

Yong

Yang

Zheng

et al. 2022

Advances in Structural Engineering

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Among the various kinds of adjustment methods to improve the material properties of recycled aggregate concrete (RAC), equivalent mortar volume (EMV) method is widely considered as economic and effective. This is mainly because that only an extra content of natural aggregates (NAs) is needed to be added in the mixture during fabricating RAC. To objectively evaluate the method, this study conducted a series of discrete element mesoscale simulations to illustrate and compare the mechanical behaviors and failure mechanisms for conventional and EMV methods designed RAC samples under uniaxial loadings. Particularly, the influences of the replacement ratio of RAs, the mixture’s water-to-cement ratio and the spatial location of coarse aggregates on the two RACs’ strength and deformation characteristics were analyzed. Additionally, generic expressions used for estimating the mechanical properties of conventional and EMV methods cast RAC samples were also tried to be established in the article. It was found by this study that: (a) As the replacement ratio grows, both the conventional RAC’s compressive strength and elastic modulus reduce monotonously, however, the tensile strength’s variation trend is highly dependent on the relative strength of new-to-old mortar; (b) Regardless of the RAC’s water-to-cement ratio, an EMV design method can always improve the elastic modulus of RAC effectively; (c) When the new mortar strength is lower than that of old mortar, adopting an EMV mix-design method notably improves the RAC’s tensile and compressive strengths, however, if the old mortar strength is obviously smaller, the EMV method’s enhancement to the concrete’s strength is limited; (d) Variabilities for compressive and tensile strengths of EMV method designed RAC samples are commonly higher than those of conventional RAC samples; and (e) Uniaxial mechanical property of RAC sample cast either using a conventional or EMV method can both be predicted with a same formulas.

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Section: Principles For Mesoscale Demmentioning

confidence: 77%

Section: Random Aggregate Modelmentioning

confidence: 99%

Section: Random Aggregate Modelmentioning

confidence: 99%

Section: Generic Expressions For Estimating Uniaxial Mechanical Prope...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Uniaxial mechanical behaviors of recycled coarse aggregate concretes cast with conventional and equivalent mortar volume methods

Yong

Yang

Zheng

et al. 2022

Advances in Structural Engineering

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Retracted: Predicting the compressive strength of modified recycled aggregate concrete

Yang

Feng

Esmaeili‐Falak

2022

Structural Concrete

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Reuse and recycling of construction wastes effectively prevent further destruction of the environment and nature due to the construction industry. One of the conventional methods is the reapplication of recycled aggregates (RAs) in concrete mix design and construction. Compressive strength (CS) is a considerable representation of the mechanical properties of recycled aggregate concrete (RAC). The present study is divided into two parts of experimental and predicting. In the laboratory studies phase, RA was used with 100% replacement. Due to the proven defects in RAC, glass fibers and silica fume (variables) have been used to compensate for these defects. Different mixing designs were used to construct concrete samples, and then the CS of each specimen was measured in the laboratory. Afterward, these data were used as training and testing in various conventional, ensembled and hybrid models as the tree-based learning algorithms, rules, Lazy-learning Algorithms, Functions, and Meta classifiers. Considering the applied performance statistical criteria (R 2 , root mean squared error, mean absolute error, and mean absolute percentage error), all models have provided excellent and acceptable results, which the precision of the multilayer perceptron single model and additive regression-random Forest hybrid model have the best agreement with measured values of CS of RAC.

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Image-Based Microstructural Finite Element Model of Concrete Subjected to Freeze–Thaw Cycles

Alhusain,

Al-Mayah

2024

Lecture Notes in Civil Engineering

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Modeling and predicting the mechanical behavior of concrete under uniaxial loading

Cited by 20 publications

References 37 publications

Uniaxial mechanical behaviors of recycled coarse aggregate concretes cast with conventional and equivalent mortar volume methods

Uniaxial mechanical behaviors of recycled coarse aggregate concretes cast with conventional and equivalent mortar volume methods

Retracted: Predicting the compressive strength of modified recycled aggregate concrete

Image-Based Microstructural Finite Element Model of Concrete Subjected to Freeze–Thaw Cycles

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