Towards a realistic morphological model for the meso-scale mechanical and transport behavior of cementitious composites

Niknezhad, Davood; Raghavan, Balaji; Bernard, Fabrice; Kamali-Bernard, Siham

doi:10.1016/j.compositesb.2015.06.024

Cited by 25 publications

(16 citation statements)

References 30 publications

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“…Concrete Damage Plasticity (CDP) is a popular constitutive model that was introduced by Kachanov [43] and further developed by Rabotnov [44] and Jankoviak et al [45]. The model has been used in this paper, as in the authors' previous work [26], for describing the elasto-plastic mechanical behavior of the mortar phase. This model uses the concept of isotropic damaged elasticity in combination with isotropic tensile and compressive plasticity to represent the inelastic behavior of the mortar.…”

Section: Mechanical Behaviormentioning

confidence: 97%

“…In order to calculate the damaged macroscopic permeability tensor K D , we have followed our previous approach in [26], and represented the specimen by a series of inter-connected cylinders of identical diameter, using however, a conforming mesh -in fact the very same FE mesh used for the mechanical analysis -rather than a non-conforming mesh that ignores the heterogeneities which was used in our previous work. Admittedly, this will introduce some degree of mesh-dependence in the results obtained when comparing the results obtained during different mechanical analyses, but will significantly save on computational time and effort since the element-wise ϵ-d results may directly be used to estimate damaged permeability values without a costly interpolation or Diffuse Approximation [51].…”

Section: Numerical Estimation Of the Macroscopic Permeability Tensormentioning

confidence: 99%

“…3. All mesostructures have been obtained using the computational geometric modeling algorithms described in detail in [26] and programmed in MATLAB [42] (Fig. 4).…”

Section: Morphological Model Of Concrete At the Mesoscale Levelmentioning

confidence: 99%

“…The literature shows 2D representations with circles/polygons [31,15,32], 3D analyses with spherical representations [25,33,30,34,26], realistic particles [35,26,36] and even considered the phenomenon of aggregate segregation due to elevated fluidity [26]. Finite Element mechanical analysis of the created mesostructures could use conforming/non-conforming meshes with tetrahedral [26] or cubic elements [37].…”

Section: Introductionmentioning

confidence: 99%

“…As far as the aggregate phase is concerned, one needs to take into account their mineralogical nature, morphology, granulometric distribution and volume fraction. Depending on the type of aggregate (siliceous, plastic, calcareous) ergo texture (rough/smooth) [24] one can expect varying levels of bonding to the mortar phase [25], and have angular or rounded shapes [26], and of course volume fraction and gradation [27][28][29] all of which can significantly modify the stress distribution and thus the damage distribution within the mortar phase [30] and thus contribute to wildly varying transport parameters (e.g. permeability) of the whole composite.…”

Section: Introductionmentioning

confidence: 99%

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Combined meso-scale modeling and experimental investigation of the effect of mechanical damage on the transport properties of cementitious composites

Raghavan¹,

Niknezhad²,

Bernard³

et al. 2016

Journal of Physics and Chemistry of Solids

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International audienceThe transport properties of cementitious composites such as concrete are important indicators of their durability, and are known to be heavily influenced by mechanical loading. In the current work, we use meso-scale hygro-mechanical modeling with a morphological 3D two phase mortar-aggregate model, in conjunction with experimentally obtained properties, to investigate the coupling between mechanical loading and damage and the permeability of the composite. The increase in permeability of a cylindrical test specimen at 28% aggregate fraction during a uniaxial displacement-controlled compression test at 85% of the peak load was measured using a gas permeameter. The mortar's mechanical behavior is assumed to follow the well-known compression damaged plasticity (CDP) model with isotropic damage, at varying thresholds, and obtained from different envelope curves. The damaged intrinsic permeability of the mortar evolves according to a logarithmic matching law with progressive loading. We fit the matching law parameters to the experimental result for the test specimen by inverse identification using our meso-scale model. We then subject a series of virtual composite specimens to quasi-static uniaxial compressive loading with varying boundary conditions to obtain the simulated damage and strain evolutions, and use the damage data and the previously identified parameters to determine the evolution of the macroscopic permeability tensor for the specimens, using a network model. We conduct a full parameter study by varying aggregate volume fraction, granulometric distribution, loading/boundary conditions and “matching law” parameters, as well as for different strain–damage thresholds and uniaxial loading envelope curves. Based on this study, we propose Avrami equation-based upper and lower bounds for the evolution of the damaged permeability of the composite

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Section: Mechanical Behaviormentioning

confidence: 97%

Section: Numerical Estimation Of the Macroscopic Permeability Tensormentioning

confidence: 99%

“…3. All mesostructures have been obtained using the computational geometric modeling algorithms described in detail in [26] and programmed in MATLAB [42] (Fig. 4).…”

Section: Morphological Model Of Concrete At the Mesoscale Levelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Combined meso-scale modeling and experimental investigation of the effect of mechanical damage on the transport properties of cementitious composites

Raghavan¹,

Niknezhad²,

Bernard³

et al. 2016

Journal of Physics and Chemistry of Solids

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Experimental Investigation of High-Strength Self-Compacting Fibre-Reinforced Concrete

Zende

Khadiranaikar

2018

Lecture Notes in Civil Engineering

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A novel approach to refining mesoscale geometric modeling for segregation in concrete

Ren,

Pacheco,

de Brito

et al. 2024

Low-carbon Mater. Green Constr.

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Segregation results in worse mechanical and durability performance of concrete. Therefore, an accurate modelling of segregation is required for reliable mesoscale modelling. In this context, this paper presents a method to develop the geometric mesoscale modelling of concrete taking into account segregation. In this method, coarse aggregate particles are generated as ellipsoids of random geometry and are randomly placed within concrete. The specimen is stratified in different numbers of layers ($$NoL$$ NoL ) that represent different segregation conditions. The geometric models of four concrete mix designs are generated and the relevant key parameters, e.g. aggregate distribution are analysed and validated. In addition, the segregation level of generated models is classified based on the volumetric index and the correspondence between segregation level and the value of $$NoL$$ NoL is presented. The results show that 1) The generated geometric models with $$NoL$$ NoL ranging from 1 to 10 align well with real segregation in concrete and can accurately represent the majority of segregation cases resulting from various experimental factors; 2) The $$NoL$$ NoL reflects the segregation level: more layers indicate a more heterogeneous mesostructure; 3) The larger aggregates of the generated models tend to settle at the bottom, while smaller aggregates rise toward the top, leading to uneven vertical distribution, especially as the $$NoL$$ NoL increases; 4) the mix 1 with low aggregate content can represent the construction material with large segregation, while the mix 2 is inverse.

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Towards a realistic morphological model for the meso-scale mechanical and transport behavior of cementitious composites

Cited by 25 publications

References 30 publications

Combined meso-scale modeling and experimental investigation of the effect of mechanical damage on the transport properties of cementitious composites

Combined meso-scale modeling and experimental investigation of the effect of mechanical damage on the transport properties of cementitious composites

Experimental Investigation of High-Strength Self-Compacting Fibre-Reinforced Concrete

A novel approach to refining mesoscale geometric modeling for segregation in concrete

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