Bond-slip relations for PBO-FRCM materials externally bonded to concrete

D’Ambrisi, Angelo; Feo, Luciano; Focacci, Francesco

doi:10.1016/j.compositesb.2012.06.002

Cited by 193 publications

(87 citation statements)

References 26 publications

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“…For PBO FRCM materials, D'Antino et al (2014) also concluded that, prior to failure, a considerable fibers/matrix slip occurs and at failure; the debonding occurs at the fibers/matrix interface without detachment of the cement-based matrix from the concrete substrate [14]. D'Ambrisi et al (2012) found that the fibers' arrangement and the number of fiber net layers control the bond behavior and characteristics of FRCM since the delamination occurs at the fibers/matrix interface [15]. It is worth mentioning that all of the available investigations in the current literature on the bond performance of FRCM and concrete were carried out using single or double shear testes (direct shear) on concrete blocks with only PBO FRCM strips.…”

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confidence: 99%

Effect of the Fiber Type and Axial Stiffness of FRCM on the Flexural Strengthening of RC Beams

Jabr

El-Ragaby

Ghrib

2017

Fibers

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Abstract:The use of externally-bonded fiber-reinforced polymer (FRP) sheets has been successfully used in the repair and strengthening of both the shear and flexural capacities of reinforced concrete (RC) beams, slabs and columns since the 1990s. However, the externally-bonded FRP reinforcements still present many disadvantages, such as poor performance in elevated temperature and fire, lack of permeability and strength degradation when exposed to ultraviolet radiation. To remedy such drawbacks, the fiber-/fabric-reinforced cementitious matrix (FRCM) has been recently introduced. The FRCM system consists of a fiber mesh or grid embedded in a cementitious bonding material. The present research investigates the flexural strengthening of reinforced concrete (RC) beams with FRCM. The experimental testing included eight large-scale concrete beams, 150 mm × 250 mm × 2400 mm, internally reinforced with steel bars and strengthened in flexure with FRCM. The investigated parameters were the internal steel reinforcement ratio and the FRCM systems. Two steel reinforcement ratios of 0.18 and 0.36 of the balanced reinforcement ratio, as well as three FRCM systems using glass, carbon and PBO fibers were investigated. Test results are presented in terms of load-deflection, load-strain and load-crack width relationships. The test results indicated that the PBO FRCM significantly increased the ultimate capacity of the strengthened RC beams with both low and moderate internal reinforcement ratios compared to the glass and carbon FRCM.

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mentioning

confidence: 99%

Effect of the Fiber Type and Axial Stiffness of FRCM on the Flexural Strengthening of RC Beams

Jabr

El-Ragaby

Ghrib

2017

Fibers

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“…There are many strengthening systems based on cement matrix for RC structures in technical literature such as the textile reinforced concrete (TRC) (Bruckner et al 2005); the textile reinforced mortar (TRM) (Triantafillou 2005); the fiber reinforced concrete (FRC) (Wu and Sun 2005); the mineral based composites (MBC) (Taljsten and Blanksvard 2007) and the fiber reinforced cementitious mortar (FRCM) (Bisby et al 2011, Ombres 2011a, 2011b, D'Ambrisi et al 2012a, 2012b, 2013. A comprehensive test program has been conducted to evaluate the performance of different cement-based inorganic pastes towards the development of fiber reinforced inorganic polymer (FRIP) composite (Dai et al 2014) The bond between the strengthening material and the concrete substrate is the key determining factor for the effectiveness of any strengthening systems.…”

Section: Introductionmentioning

confidence: 99%

Investigation of The Bond Behaviour Between PBO-FRCM Strengthening Material and Concrete

Tran

Stitmannaithum

Ueda

2014

ACT

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Fiber reinforced cementitious mortar (FRCM) systems, innovative strengthening systems, for repairing and strengthening concrete and masonry structures are an alternative option to traditional techniques such as fiber reinforced polymers (FRPs), steel plated bonding, and section enlargement. In this paper, a FRCM strengthening system made of polypara phenylene benzobisoxazole (PBO) fiber mesh embedded in cementitious matrix and bonded to concrete is investigated. There are two main parts in this paper: (i) the effective bond length of PBO mesh in PBO-FRCM system and (ii) the bond stress-slip relationship between PBO mesh and concrete substrate. An experimental program of single pull-out shear tests for the PBO-FRCM system is designed and conducted to verify the above two purposes. The results of this study can be used to estimate the effective bond length of PBO mesh in PBO-FRCM systems and also investigate if the debonding phenomenon occurs in the cementitious matrix or at the fiber and matrix interface. The comparison between the PBO-FRCM system and the ordinary FRP system is also discussed.

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“…And thus, the concrete/UHTCC interface becomes a weak transition face from concrete to UHTCC. In contrast, FRCM (fiber reinforced cementitious mortar) strengthening system showed several types of interface crack propagation modes due to different debonding mechanisms, including the interface debonding within the cementitious matrix, at the fiber mesh and cementitious matrix interface, at the concrete/matrix interface, and in the supporting concrete (Ortlepp et al 2006;D'Ambrisi et al 2012;Tran et al 2014).…”

Section: Interface Debonding Behaviormentioning

confidence: 99%

Flexural and Interface Behaviors of Reinforced Concrete/Ultra-high Toughness Cementitious Composite (RC/UHTCC) Beams

Hou

Hong

et al. 2015

ACT

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This paper presents an experimental investigation on the response of reinforced concrete (RC) beams with the use of ultra-high toughness cementitious composite (UHTCC) in the tension zone. Two parameters, the longitudinal reinforcement ratio and the depth of UHTCC layer, were varied. The failure mechanism, flexural behavior, interface performance, and cracking pattern were compared between RC and RC/UHTCC beams as well as between RC/UHTCC beams with different depths of the UHTCC layer. The experimental results revealed that the yielding load was improved apparently for beams with a reinforcement ratio of 0.67%, and the macro wide cracks in concrete turned into multiple tight cracks in the UHTCC layer depending on the prominent crack dispersion capacity of the UHTCC. However, RC/UHTCC beams with 1.0% and 1.73% reinforcement ratios showed shear-interface debonding failure prior to the yielding of reinforcement, and the failure resulted from the accumulated interface crack extension up to the support and the crush of concrete. Moreover, the theoretical analysis indicates that the interface cracking strength and ultimate interface bonding strength are related with the reinforcement ratio and UHTCC depth. The tensile stress difference of reinforcement in the UHTCC layer plays a controlling role in the interface debonding between concrete and UHTCC. The present study provides significant insights for the engineering application of hot-casting RC/UHTCC composite beam.

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Bond-slip relations for PBO-FRCM materials externally bonded to concrete

Cited by 193 publications

References 26 publications

Effect of the Fiber Type and Axial Stiffness of FRCM on the Flexural Strengthening of RC Beams

Effect of the Fiber Type and Axial Stiffness of FRCM on the Flexural Strengthening of RC Beams

Investigation of The Bond Behaviour Between PBO-FRCM Strengthening Material and Concrete

Flexural and Interface Behaviors of Reinforced Concrete/Ultra-high Toughness Cementitious Composite (RC/UHTCC) Beams

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