The role of material fabric in concrete under uniaxial compression

Ghosh, Subha; Deb, Arghya

doi:10.1016/j.ijsolstr.2021.111079

Cited by 4 publications

(33 citation statements)

References 42 publications

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“…To incorporate the effect of particle geometry, area-weighted normals 𝑎 𝑘 𝑖 , def ined as 𝑎 𝑘 𝑖 = 𝐴 𝑘 𝑛 𝑘 𝑖 , where 𝐴 𝑘 is the area of the 𝑘 th interface, was used in the computation of the fabric tensors. 14 With this modification, the 𝑚 th order moment tensor with components 𝑁 𝑖 1 𝑖 2 …𝑖 𝑚 can be defined as:…”

Section: The Materials Fabricmentioning

confidence: 99%

“…is the average contact density of the assembly, 𝜓(𝐧) denotes the density of the contact orientation, and the integration is performed over the entire solid angle spanned by the domain. It has been shown in Ghosh and Deb 14 that the covariance between ̄𝐥 and 𝐭𝑎 is proportional to ̄𝐥 ⊗ 𝐭𝑎. On decomposing the average branch and traction vectors into their normal and tangential component vectors, one gets:…”

Section: Stress Fabric Relationshipmentioning

confidence: 99%

“…However, this explanation, linked to the "increased redundancy factor" of angular vis-à-vis rounded specimens, has little to do with the material fabric. Recent work by the authors 14,23 has shown that the material fabric in concrete depends strongly on aggregate angularity. In particular, the more anisotropic fabric in angular specimens gives rise to a stronger "internal confinement mechanism" which contributes significantly to the higher compressive strength of angular specimens.…”

Section: Introductionmentioning

confidence: 99%

“…As part of this, an expression for the volume-averaged stress for an assembly of polyhedral discrete particles with cohesion was derived by the authors. 14 The derivation accounted for the finite contact area between the particles. In addition, unlike in granular materials without cohesion, the branch and traction vectors were found to be correlated.…”

Section: Introductionmentioning

confidence: 99%

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The role of material fabric in confined concrete

Ghosh

Deb

2022

Num Anal Meth Geomechanics

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The paper is a comparative study of the role of material fabric in unconfined concrete and in concrete subjected to external confinement. In unconfined concrete, the material fabric is the principal reason for the early onset of shear bands in specimens with rounded aggregates. Anisotropy in the material fabric also determines the strength of the “internal confinement mechanism,” and contributes to higher macro strength in specimens with angular aggregates. In contrast, in confined specimens, fabric isotropy, typical of rounded aggregates, is found to be more suited to capture the benefits of external confinement. With increase in axial strain, the fabric dependent anisotropic contribution grows more slowly in specimens with rounded aggregates. This facilitates rapid mobilization of confining pressure, and contributes to the higher confining efficiency of such specimens. However, higher confining pressure in specimens with rounded aggregates also results in such specimens being more susceptible to mortar damage and Mode II interface fracture than their angular counterparts.

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Section: The Materials Fabricmentioning

confidence: 99%

Section: Stress Fabric Relationshipmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The role of material fabric in confined concrete

Ghosh

Deb

2022

Num Anal Meth Geomechanics

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“…Some concrete materials are developed to be eco-friendly, making use of environmental wastes and minimizing embodied carbon. Others are designed to optimize a set of objective functions, such as ECC, fiber reinforced concrete (FRC), or high-performance concrete (HPC), for optimized durability [11,12], compressive performance [11,13,14], tensile and flexural performance [15][16][17], crack mitigation [18], etc.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study on 3D Printed Cementitious Composites Mixes Subjected to Axial Compression

et al. 2021

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Aptly enabled by recent developments in additive manufacturing technology, the concept of functionally grading some cementitious composites to improve structural compression forms is warranted. In this work, existing concrete models available in Abaqus Finite Element (FE) packages are utilized to simulate the performance of some cementitious composites numerically and apply them to functional grading using the multi-layer approach. If yielding good agreement with the experimental results, two-layer and three-layer models case combinations are developed to study the role of layer position and volume. The optimal and sub-optimal performance of the multi-layer concrete configurations based on compressive strength and sustained strains are assessed. The results of the models suggest that layer volume and position influence the performance of multi-layer concrete. It is observed that when there exists a substantial difference in material strengths between the concrete mixes that make up the various layers of a functionally graded structure, the influence of position and of material volume are significant in a two-layer configuration. In contrast, in a three-layer configuration, layer position is of minimal effect, and volume has a significant effect only if two of the three layers are made from the same material. Thus, a multilayered design approach to compression structures can significantly improve strength and strain performance. Finally, application scenarios on some structural compression forms are shown, and their future trajectory is discussed.

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