Review of fundamental assumptions of the Two-Phase model for aggregate interlocking in cracked concrete using numerical methods and experimental evidence

Pundir, Mohit; Tirassa, Max; Ruiz, Miguel Fernández; Muttoni, Aurelio; Anciaux, Guillaume

doi:10.1016/j.cemconres.2019.105855

Cited by 16 publications

(9 citation statements)

References 17 publications

(22 reference statements)

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“…43,63,64 This would require the cohesive elements to be smaller than the characteristic length and would justify an usage of our hybrid approach. The presented method would also allow to study the propagation of cracks along surfaces with interlocking protuberances such as aggregates and re-bars in concrete 60,65,66 or for bioinspired sutures. 67,68 These are forming an active field of research, since interlocking mechanisms introduce a resistance to crack propagation which can increase the effective material strength.…”

Section: Discussionmentioning

confidence: 99%

“…Nevertheless there are applications where an interfacial crack study is required along a predefined path, for example, in geosciences when a weak interface is to be studied, [48][49][50][51] when rough cracks may, under mixed-mode loading, produce interlocking stresses increasing the shear strength [52][53][54][55][56][57][58][59][60] or in the study of adhesive bonds in laminar structures.…”

Section: Isotropic Body Weak Interfacementioning

confidence: 99%

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Coupling between cohesive element method and node‐to‐segment contact algorithm: Implementation and application

Pundir

Anciaux

2021

Numerical Meth Engineering

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In materials, the evolution of crack surfaces is intimately linked with the self-contact occurring between them. The developed contact forces not only mitigate the effect of stress concentration at crack tip but also contribute significantly to the transfer of shear and normal stresses. In this article, we present a numerical framework to study the simultaneous process of fracture and self-contact between fracturing surfaces. The widely used approach, where contact constraints are enforced with the cohesive element traction separation law, is demonstrated to fail for relative displacements greater than the characteristic mesh length. A hybrid approach is proposed, which couples a node-to-segment contact algorithm with extrinsic cohesive elements. Thus, the fracture process is modeled with cohesive elements, whereas the contact and the friction constraints are enforced through a penalty-based method. This hybrid cohesive-contact approach is shown to alleviate any mesh topology limitations, making it a reliable and physically based numerical model for studying crack propagation along rough surfaces.

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Section: Discussionmentioning

confidence: 99%

Section: Isotropic Body Weak Interfacementioning

confidence: 99%

Coupling between cohesive element method and node‐to‐segment contact algorithm: Implementation and application

Pundir

Anciaux

2021

Numerical Meth Engineering

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“…A higher quantity of aggregates is expected in the cracked shear plane. It increases crack roughness and strengthens the aggregate interlock for shear resistance in beams [54]. e aggregate treatment increased shear resistance, with treated aggregate size 20 mm showing the highest strength of 2.01 N/mm 2 and 0.95 N/mm 2 for a/ d � 1.25 and 2.5, respectively.…”

Section: Effect Of Aggregate Size On Ultimate Shearmentioning

confidence: 95%

Shear Performance of Concrete Beams with a Maximum Size of Recycled Concrete Aggregate

Odero¹,

Mutuku

Nyomboi³

et al. 2022

Advances in Materials Science and Engineering

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e use of concrete mixes with recycled materials has gained traction in research communities. However, the major drawback of the recycled concrete aggregate (RCA) has been the contribution of the cement paste mortar attached to the surface. e quantity of surface-attached mortar on the virgin aggregate dominates and de nes the shear performance of concrete beams. Concrete shear failure is usually abrupt and catastrophic, especially in concrete beams without shear reinforcement. e e ectiveness of the maximum size of RCA for the performance of untreated and treated with pozzolanic cement and rice husk ash (RHA) slurry was investigated. A total of sixteen ( 16) beams containing RCA of four (4) maximum sizes, 10, 14, 20, and 25 mm, were prepared and tested after 28 days. e beams were loaded in shear using shear span-depth ratios of 1.25 and 2.50. e results showed that the shear strength of the beams increases as the aggregate size increases to a maximum size of 20 mm, beyond which the shear strength reduces. It was attributed to the attached mortar, which increased as the size of the aggregate increased, creating a weak zone for shear failure in the concrete. In addition, RCA pretreatment using slurry-containing cement and RHA strengthened the attached mortar on the aggregate surface. It resulted in a dense and more compact aggregate that slightly improved the shear strength by about 2.2% for beams containing 20 mm RCA size. e ultimate shear strength of the experimental work in the study was predicted using eight (8) selected models from the literature. Models that account for the aggregate size and shear span to depth ratio resulted in shear strength ratios of 1.

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“…The empirical model for estimating dowel action was proposed in [4]. Several models for describing the effect of aggregate interlock were developed, among them well known model derived by Walraven [25] and new propositions presented recently in [26,27]. However, the activation of the individual shear transfer mechanism seems to be depended on the width of the inclined crack.…”

Section: Shear Transfer Actionsmentioning

confidence: 99%

Analysis of fracture processes in reinforced concrete beams without stirrups

Słowik

2021

Frattura Ed Integrità Strutturale

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The analysis of fracture processes which led to shear failure in reinforced concrete beams without transverse reinforcement was performed on the basis of test results from the author’s own experimental investigation and numerical simulations. The variable parameters during the experiment were a beam’s length and a shear span. It was observed that the character of failure in the beams depended on the beam’s length and the span-to-depth ratio. In slender beams characterized by the shear span-to-depth ratio 3.4 and 4.1, the formation of the critical diagonal crack caused a brittle, sudden failure and the shear capacity was low. In short beams, when the shear span-to-depth ratio was 1.8 and 2.3, the failure process had a more stable character with a slow developing of inclined cracks and the significantly higher load capacity was reached. The activation of various shear transfer mechanisms was examined with regard to the slenderness of the member and the transition between a beam action which took place in slender beams to an arch action which predominated in short beams was described.

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Review of fundamental assumptions of the Two-Phase model for aggregate interlocking in cracked concrete using numerical methods and experimental evidence

Cited by 16 publications

References 17 publications

Coupling between cohesive element method and node‐to‐segment contact algorithm: Implementation and application

Coupling between cohesive element method and node‐to‐segment contact algorithm: Implementation and application

Shear Performance of Concrete Beams with a Maximum Size of Recycled Concrete Aggregate

Analysis of fracture processes in reinforced concrete beams without stirrups

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