Stainless Steel Bonded to Concrete: An Experimental Assessment using the DIC Technique

Biscaia, Hugo C.; Franco, Noel; Chastre, Carlos

doi:10.1186/s40069-018-0229-8

Cited by 25 publications

(15 citation statements)

References 49 publications

(63 reference statements)

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“…Although the use of stainless steel reinforcement has been recommended in aggressive environments [5][6][7], studies investigating its influence on the bond mechanism between concrete and reinforcement are quite limited [8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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Bond-Slip Behavior between Stainless Steel Rebars and Concrete

et al. 2020

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Maintenance of reinforced concrete structures is a prevailing topic, especially with regard to lifeline structures and bridges, many of which are now designed with a service life beyond 100 years. Reinforcement made of ordinary (carbon) steel may corrode in aggressive environments. Stainless steel, being much more resistant to corrosion, is a valid solution to facilitate the protection of the works, increasing the service life and reducing the need for repair and maintenance. Despite the potential for stainless steel to reduce maintenance costs, studies investigating the influence of stainless steel on the behavior of reinforced concrete structures are limited. This study investigated the bond behavior of stainless steel rebars by means of experimental tests on reinforced concrete specimens with different concrete cover thicknesses, concrete strengths, and bar diameters. In each case, identical specimens with carbon steel reinforcement were tested for comparison. The failure modes of the specimens were examined, and a bond stress–slip relationship for stainless steel bars was established. This research shows that the bond behavior of stainless steel rebars is comparable to that of carbon steel bars.

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Section: Introductionmentioning

confidence: 99%

“…In [13], stainless steel application using externally bonded reinforcement (EBR) or near-surface mounted (NSM) bonding techniques was investigated for the structural strengthening of reinforced concrete. The interfacial bond-slip relationships of the NSM and EBR systems were described by means of trapezoidal and power functions.…”

Section: Introductionmentioning

confidence: 99%

Bond-Slip Behavior between Stainless Steel Rebars and Concrete

et al. 2020

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“…11 In the direct method, the local bond-slip relationship is obtained from a local approximation between the theoretical and the experimental bond-slip relationships, whereas in the indirect method it is obtained from the global behaviour, that is, from the load-slip relationship of the CFRP-to-parent material interface. Both ways have already been shown to reproduce quite precise results when implemented in different numeric strategies, for example, as seen in the studies by Nakaba et al, 12 Dai et al, 13,14 Ferracuti et al, 15 Mazzotti et al, 16 Liu and Wu, 17 Zhang et al 18 and Biscaia et al 19 The other monitoring approach that has been used recently by different researchers to assess the bond between an FRP composite and a substrate is the use of optical measurements such as digital image correlation (DIC), [20][21][22][23][24][25] laser interferometry or electronic speckle pattern interferometry (ESPI). 26 Unlike the strain gauges, where the strains are measured at a specific point, the main advantage of these techniques is the continuous displacement field that it is possible to generate.…”

Section: Introductionmentioning

confidence: 90%

“…Even at low cost, it is possible for anyone to easily measure displacements of two-dimensional (2D) problems such as the surfaces of an in-plane loaded structural element. Despite some studies [19][20][21][22] that indicate DIC can produce highly accurate measurements in the bond assessment between an FRP composite and a substrate, this is still not a wellestablished method. The main reason for that is the noisy signal commonly obtained from the displacement fields in the DIC measurements.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the determination of the bond stresses from the slip data requires two differential operations, which amplifies the fluctuations of the displacement fields measured with DIC. 19,27 Consequently, the local bond-slip relationship becomes hard to define with high accuracy. To bypass this difficulty, it can be found in the literature that researchers adjusted the slip distribution at the debonding instant into a theoretical and continuous formula.…”

Section: Introductionmentioning

confidence: 99%

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Using digital image correlation to evaluate the bond between carbon fibre-reinforced polymers and timber

Biscaia

Canejo

Zhang

et al. 2021

Structural Health Monitoring

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The use of optic measurements such as digital image correlation to take strain measurements of fibre-reinforced polymers bonded to a substrate has been on the increase recently. This technique has proven to be useful to fully characterize the bond behaviour between two materials. Although modern digital cameras can take high-definition photos, this task is far from simple due to the tiny displacements that need to be measured. Consequently, digital image correlation measurements lead to relative errors that, at an initial stage of the debonding process, are higher than those calculated close to the debonding of the fibre-reinforced polymer from the substrate. This study aims to evaluate and analyse the use of the digital image correlation technique on the bond between carbon fibre-reinforced polymer laminates and timber when subjected to a pull-out load consistent with fracture Mode II. To allow the quantification of the relative errors obtained from the digital image correlation measurements during the full debonding process, several strain gauges were used to measure the strains in the carbon fibre-reinforced polymer composite. The accuracy of the digital image correlation measurements is analysed by comparing it with those obtained from the strain gauges, which is a very well-established measuring technique. Another contribution of this study is to check the versatility of the digital image correlation measurements on a broader range of situations. To that end, several timber prisms were bonded with seven different bonding techniques with and without the installation of a mechanical anchorage at the carbon fibre-reinforced polymer unpulled end. The results showed that the digital image correlation technique was able to track the slips calculated from the strain gauge measurements until the debonding load, but after that, some difficulties to measure the displacements of the anchored carbon fibre-reinforced polymer-to-timber joints were detected. The digital image correlation technique also over predicted bond stresses when compared with those taken from the strain gauges, which led to bond–slip relationships with higher bond stresses.

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Feasibility of using aluminum alloy bars as near‐surface mounted reinforcement for flexural strengthening of reinforced concrete beams

Xing

Chang

Ozbulut

2020

Structural Concrete

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Aluminum alloys (AAs) possess various advantageous properties such as good corrosion resistance and high ductility and have recently gained interest in strengthening reinforced concrete (RC) structures. This paper investigates the potential application of AA bars as the near‐surface mounted (NSM) reinforcement in flexure strengthening of RC beams. A total of seven RC beams including one reference specimen and six specimens strengthened with NSM AA bars were designed and loaded monotonically up to failure. The tensile steel reinforcement ratio, NSM reinforcement ratio, precracking load, and bonding area of NSM reinforcement were selected as the main test variables. Results suggest that both the flexural capacity and stiffness of the strengthened beams improved with the use of NSM AA bars compared to the reference beam, and all the strengthened concrete beams exhibited a ductile failure mode. Nevertheless, increases in flexural load carrying capacities were modest when the AA bars were used as NSM reinforcement. Furthermore, an analytical model, which combined the sectional analysis method and interfacial stress analysis model, was developed to predict the load versus mid‐span deflection relationship of the concrete beams strengthened with NSM AA bars. The developed model was also capable of predicting the load–strain relationships in AA reinforcement. Good agreements were achieved between the analytical results and experimental results.

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Stainless Steel Bonded to Concrete: An Experimental Assessment using the DIC Technique

Cited by 25 publications

References 49 publications

Bond-Slip Behavior between Stainless Steel Rebars and Concrete

Bond-Slip Behavior between Stainless Steel Rebars and Concrete

Using digital image correlation to evaluate the bond between carbon fibre-reinforced polymers and timber

Feasibility of using aluminum alloy bars as near‐surface mounted reinforcement for flexural strengthening of reinforced concrete beams

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