Shear Bond between Ultra-High Performance Fibre Reinforced Concrete Overlays and Normal Strength Concrete Substrates

Javidmehr, Sara; Empelmann, Martin

doi:10.3390/su13158229

Cited by 9 publications

(6 citation statements)

References 22 publications

(38 reference statements)

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“…Other than this, increasing adhesive thickness reduces maximum loads at the overlap side (73). Cattaneo et al (72) discovered an analytical study of concrete bonding. The push-off test does not allow for the application of reversal cyclic loads.…”

Section: Modified Vertical Shear Testmentioning

confidence: 99%

Effect of various interface bond tests and their failure behavior on substrate and overlay concrete -A Review

Pulkit¹,

Saini²,

Chalak³

2023

Res. Eng. Struct. Mater.

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Concrete is a widely used building material in the construction sector. Still, the lifespan of concrete is limited because many factors can influence the performance of concrete structures, which can be classified based on physical, chemical, and mechanical changes that occur during their service life. In addition, the structure's lifespan is being reduced due to adverse environmental conditions and loads. These require maintenance, restoration, or reconstruction. Therefore, considerable concrete remediation is necessary, and the best option is to repair it. However, the cost associated with restoring the deteriorating concrete structures is higher. The repaired concrete strength mainly depends on the interface layer, situated between the substrate (old) and overlay (new) concrete. The interface layer strength primarily depends on interface adhesion, friction, aggregate interlock, bonding agent, compaction, cleanliness, moisture content, concrete age, roughness, and time-dependent variables. Multiple tests are available to analyse the bonding behavior between substrate-overlay concrete. However, no particular method is available to access the bond strength. This paper describes various methods and techniques used by researchers to evaluate bond strength. The reviewed summary has shown that concrete repair is the best solution, and higher-strength concrete uses show better shear results; also, conventional concrete is more economical than higher-strength concrete. Among all the available tests the bi-surface shear test and slant shear test are the more suitable method to determine the bond strength.

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Section: Modified Vertical Shear Testmentioning

confidence: 99%

Effect of various interface bond tests and their failure behavior on substrate and overlay concrete -A Review

Pulkit¹,

Saini²,

Chalak³

2023

Res. Eng. Struct. Mater.

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“…In other words, the shear and bend stresses can affect the interface bonding zone, resulting in the concentration of stress within the interface bonding zone, which affects the reliability of the test results. Guan [41] and Javidmeh [42] designed the L-shaped shear test to overcome the shortcomings of the single-sided direct shear test (Figure 7b). This approach can reduce the influence of the eccentric load induced by the stress concentrations within the interfacial bonding zone.…”

Section: Direct Shear Testmentioning

confidence: 99%

“…If the axial compressive stress at failure (σo) and the interfacial angle (α) are known, the normal (σn) and shear (τn) stresses at the interface can be calculated according to the diagram in Figure 8b. Guan [41] and Javidmeh [42] designed the L-shaped shear test to overcome the shortcomings of the single-sided direct shear test (Figure 7b). This approach can reduce the influence of the eccentric load induced by the stress concentrations within the interfacial bonding zone.…”

Section: Slant Shear Testmentioning

confidence: 99%

Review of the Interfacial Bonding Properties between Ultrahigh-Performance Concrete and Normal Concrete

Yao

et al. 2023

Applied Sciences

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As a high-quality building material exhibiting excellent toughness and durability, ultrahigh-performance concrete (UHPC) is increasingly being used in the construction industry and as building reinforcement. During the reinforcement of existing concrete structures with UHPC, their interface is the weakest part of a structure. Interface bonding ensures the operation of two types of materials together. However, existing studies rarely report the bonding of the UHPC–normal concrete (NC) interface. Herein, the existing test methods and interface bonding mechanisms are summarized. Subsequently, the differences among relevant design codes are investigated by comparing different theoretical formulas. Important influencing factors of the reinforcement method, namely, interface roughness, fiber type and content, interface agent type and content, moisture content, existing concrete strength, cementitious material content, curing conditions, freeze–thaw cycles, and chloride ions, are also considered. Further, the enhancement mechanism of the characteristics of the UHPC–NC interface is clearly described. Finally, the shortcomings and application prospects of the interfacial bonding properties are highlighted.

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“…The goal of this research was to further extend the knowledge of shear interface behaviour and the influence of different contributors to interface shear resistance. A statistical analysis of the experimental shear tests performed by other authors [16,[18][19][20][21][22][23][24][25][26][27][28] was carried out and curves of the shear stress-slippage relationship at different stages were proposed. This analytical model can be employed not only up to the ultimate interface shear capacity (which is the case for most calculation methods in the design norms), but also until the stage of severe layer slippage.…”

Section: Introductionmentioning

confidence: 99%

Analytical Method and Analysis of Cold-Joint Interface

et al. 2023

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The behaviour of the interface between two concrete layers, subjected to shear, is a complex process that is influenced by many different parameters. Knowledge of concrete interface performance is insufficient to this day. Most of the existing analytical methods are only suitable for determining the highest interface shear resistance and do not consider the interface behaviour at other stages. This article focuses on smooth concrete interfaces, which have their layers cast at different times (cold-joint interface). By analysing the results of different experimental push-off tests, presented in the literature, a novel analytical method was developed for the previously described concrete interface. Furthermore, numerical models of push-off tests were developed. A parametric numerical analysis was employed to determine the influence of various physical parameters that might affect interface shear behaviour. Most importantly, the results acquired using the proposed analytical method were compared with the findings of numerical analysis and experimental results acquired by other authors. The values of shear stress and slippage were found to be relatively close. Therefore, the proposed analytical method is suitable for the analysis of smooth concrete interfaces cast at different times.

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Shear Bond between Ultra-High Performance Fibre Reinforced Concrete Overlays and Normal Strength Concrete Substrates

Cited by 9 publications

References 22 publications

Effect of various interface bond tests and their failure behavior on substrate and overlay concrete -A Review

Effect of various interface bond tests and their failure behavior on substrate and overlay concrete -A Review

Review of the Interfacial Bonding Properties between Ultrahigh-Performance Concrete and Normal Concrete

Analytical Method and Analysis of Cold-Joint Interface

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