Experimental and numerical study on bond strength between conventional concrete and Ultra High-Performance Concrete (UHPC)

Farzad, Mahsa; Shafieifar, Mohamadreza; Azizinamini, Atorod

doi:10.1016/j.engstruct.2019.02.030

Cited by 158 publications

(53 citation statements)

References 21 publications

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“…The investigation of [1] and [45] interesting to note that different approaches for modeling the interface were proposed in these works. [60] proposed equivalent beam elements to represent the bond behavior at the interface, instead [21] proposed to construct an interface material between the concrete layers used. Both models proved to be efficient and were validated by comparing their results with a three-point flexural test.…”

Section: Numerical Investigations (Fe Simulation)mentioning

confidence: 99%

“…Both models proved to be efficient and were validated by comparing their results with a three-point flexural test. It is important to note that these models reduce the overestimation of the bond performances as compared to "tie" models, in particular when either no surface preparation or no bonding agent are employed in certain cases [11,21]. Despite their good efficiency the aforementioned models are complex and risk to reduce the practical interest of the practitioner which tends to simplify its numerical simulations by using "tie" interface conditions [31,47].…”

Section: Numerical Investigations (Fe Simulation)mentioning

confidence: 99%

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A cohesive FE model for simulating the cracking/debonding pattern of composite NSC-HPFRC/UHPFRC members

Savino

Lanzoni

Tarantino

et al. 2020

Construction and Building Materials

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The aim of this work is to propose to practitioners a simple cohesive Finite-Element model able to simulate the cracking/debonding pattern of retrofitted concrete elements, in particular Normal-Strength-Concrete members (slabs, bridge decks, pavements) rehabilitated by applying a layer of High-Performance or Ultra-High-Performance Fiber-Reinforced-Concrete as overlay. The interface was modeled with a proper nonlinear cohesive law which couples mode I (tension-crack) with mode II (shear-slip) behaviors. The input parameters of the FE simulation were provided by a new bond test which reproduces a realistic condition of cracking/debonding pattern. The FE simulations were accomplished by varying the overlay materials and the moisture levels of the substrate surface prior to overlay, since findings about their influence on the bond performances are still controversial. The proposed FE model proved to effectively predict the bond failure of composite NSC-HPFRC/UHPFRC members.

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Section: Numerical Investigations (Fe Simulation)mentioning

confidence: 99%

Section: Numerical Investigations (Fe Simulation)mentioning

confidence: 99%

A cohesive FE model for simulating the cracking/debonding pattern of composite NSC-HPFRC/UHPFRC members

Savino

Lanzoni

Tarantino

et al. 2020

Construction and Building Materials

View full text Add to dashboard Cite

show abstract

“…In order to provide a generalized model, some bonded material properties should, however, be taken into account, in particular the elastic modulus, the shear modulus, the Poisson's ratio and the geometry of both bonded materials [18,19,20,31,55]. Consequently, the deformability of the overlay can…”

Section: Lateral Shear Bond Testsmentioning

confidence: 99%

A cohesive model to predict the loading bond capacity of concrete structures repaired/reinforced with HPFRC/UHPFRC and stressed to mixed mode

Savino

Lanzoni

Tarantino

et al. 2020

Cement and Concrete Composites

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The risk of cracking/debonding of a cement overlay used to repair or strengthen an existing structure is still a key issue. Current bond test methods are not designed to measure the combined effect of peeling (mode I) and shear (mode II) on the interface. A few existing models propose theoretical approaches to predict that, but they were fitted on specific cases and lack in generality. In addition, controversial opinions about the influence of both the moisture level of the substrate surface prior to the application of the overlay and properties of the latter on the loading bond capacity call for further investigations. In this work, a cohesive model is developed to predict the loading bond capacity of an existing concrete structure overlaid by a layer of HPFRC/UHPFRC. Different bond tests were specifically designed for calibrating the cohesive parameters employed into the model, which also takes into account the type of the overlay used and the moisture conditioning level. An experimental campaign confirmed the reliability of the predictions of the proposed theoretical model.

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“…The general splitting tensile strength of the composite samples indicated an adequate strength level of bonding (>1.4 MPa), based on the quantitative bond strength quality proposed by Sprinkel and Ozyildirim [24]. Generally, improved bonding performance between UHPC and substrate NSC regardless of the moisture content of the substrate can be attributed to the good workability of UHPC which enhanced its capability to fill the pores on the substrate surface [14,25]. The good bond strength for the composite samples ensured that the ionic flow in the electrical migration test described next was related to the transport through the bulk material and cold-joint interface.…”

Section: Bond Strengthmentioning

confidence: 99%

Chloride Penetration at Cold Joints of Structural Members with Dissimilar Concrete Incorporating UHPC

et al. 2019

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This research examines the possibility of enhanced chloride transport at the cold joint incorporating UHPC. The effectiveness of the bond on chloride penetration at the concrete interface with various levels of moisture availability for the substrate at the time of UHPC repair was examined. To this effect, the substrate concrete was conditioned to different moisture content including 0%, 75%, and 100% relative humidity, and soaked prior to UHPC repair concrete casting. Chloride penetration was accelerated by an impressed current source and assessed by silver nitrate solution sprayed on the cold joint. Moreover, the tensile bond strength between substrate concrete and UHPC was measured using the splitting tensile test.

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Experimental and numerical study on bond strength between conventional concrete and Ultra High-Performance Concrete (UHPC)

Cited by 158 publications

References 21 publications

A cohesive FE model for simulating the cracking/debonding pattern of composite NSC-HPFRC/UHPFRC members

A cohesive FE model for simulating the cracking/debonding pattern of composite NSC-HPFRC/UHPFRC members

A cohesive model to predict the loading bond capacity of concrete structures repaired/reinforced with HPFRC/UHPFRC and stressed to mixed mode

Chloride Penetration at Cold Joints of Structural Members with Dissimilar Concrete Incorporating UHPC

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