Confinement of reinforced concrete columns with glass fiber reinforced cementitious matrix jackets

Faleschini, Flora; Zanini, Mariano Angelo; Hofer, Lorenzo; Toska, Klajdi; Domenico, Dario De; Pellegrino, Carlo

doi:10.1016/j.engstruct.2020.110847

Cited by 50 publications

(19 citation statements)

References 38 publications

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“…This in turn has created a high demand, which has contributed to the evolution of glass fiber production in recent years, simultaneously now allowing the production of fibers in any other shape or size. The most important parameter determining the production and its success is the size of the fibers [ 30 , 31 , 32 ].…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Material Properties of Mortar Reinforced with Glass Fiber: An Experimental Study

et al. 2021

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The progressive increase in the amount of glass waste produced each year in the world made it necessary to start the search for new recycling methods. This work summarizes the experimental results of the study on mortar samples containing dispersed reinforcement in the form of glass fibers, fully made from melted glass waste (bottles). Mortar mixes were prepared according to a new, laboratory-calculated recipe containing glass fibers, granite as aggregate, polycarboxylate-based deflocculant and Portland cement (52.5 MPa). This experimental work involved three different contents (600, 1200, and 1800 g/m3) of recycled glass fibers. After 28 days, the mechanical properties such as compressive, flexural, and split tensile strength were characterized. Furthermore, the modulus of elasticity and Poisson coefficient were determined. The initial and final setting times, porosity, and pH of the blends were measured. Images of optical microscopy (OM) were taken. The addition of glass fibers improves the properties of mortar. The highest values of mechanical properties were obtained for concrete with the addition of 1800 g/m3 of glass fibers (31.5% increase in compressive strength, 29.9% increase in flexural strength, and 97.6% increase in split tensile strength compared to base sample).

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Section: Introductionmentioning

confidence: 99%

Mechanical and Material Properties of Mortar Reinforced with Glass Fiber: An Experimental Study

et al. 2021

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“…The latter provided critical and valuable information about the specimens' response when they were subjected to inelastic cyclic lateral deformations [33]. Similar work can be found in literature [34,35], where the transverse reinforcement and fiber hoop strains were monitored experimentally. In particular, the strain values that exceeded the yield strain were recorded during testing for both cases of the plain S220 bars of subassemblage D2 and the B500C beam reinforcement of specimens DCM_1, DCM_2, and DCM_3 (see Figure 8a-f).…”

Section: Monitoring Of the Steel Bar Micro-strainmentioning

confidence: 81%

Seismic Performance of RC Beam–Column Joints Designed According to Older and Modern Codes: An Attempt to Reduce Conventional Reinforcement Using Steel Fiber Reinforced Concrete

Tsonos

Kalogeropoulos

Iakovidis

et al. 2021

Fibers

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An analytical and experimental investigation was conducted herein to examine the cyclic load behavior of beam–column joint subassemblages, typical of both the modern reinforced concrete (RC) structures and of the pre-1960s–1970s existing ones. Seven exterior RC beam–column joint subassemblages were constructed and subjected to earthquake-type loading. Three specimens were designed according to the requirements of the Eurocode (EC) for ductility class medium (DCM), while the other three specimens possessed poor seismic details, conforming to past building codes. The hysteresis behavior of the subassemblages was evaluated. An analytical model was used to calculate the ultimate shear capacity of the beam–column joint area, while also predicting accurately the failure mode of the specimens. It was clearly demonstrated experimentally and analytically that it is possible for excessive seismic damage of the beam–column joint region to occur when designing according to the current European building codes. In addition, the proposed analytical model was found to be very satisfactory in accurately predicting seismic behavior and in preventing the premature brittle shear failure of the joints. The seventh subassemblage, constructed with steel fiber RC and significantly less transverse reinforcement than that required according to the EC, exhibited satisfactory ductile seismic performance, demonstrating the effectiveness of the proposed design solution.

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“…The use of FRCM in place of FRP is motivated by a better compatibility with the concrete substrate, which reduces debonding phenomena especially under harsh environmental conditions [ 20 , 21 ], such as high temperatures (close to the glass transition temperature of the epoxy matrix in FRP) or high humidity conditions [ 22 , 23 , 24 , 25 ]. Experimental investigations demonstrated the effectiveness of externally bonded FRCM systems for different applications, such as flexural [ 26 , 27 , 28 , 29 ] and shear strengthening [ 30 , 31 , 32 , 33 , 34 , 35 , 36 ] as well as increase of the confinement action of reinforced concrete members [ 37 , 38 , 39 , 40 , 41 ]. A critical issue of FRCM systems concerns the interfacial bond behavior between FRCM and concrete, which may trigger different failure modes such as cohesive debonding of concrete substrate, fiber rupture, fiber sliding within the matrix, and detachment at matrix-to-substrate interface.…”

Section: Introductionmentioning

confidence: 99%

Experimental Characterization of the FRCM-Concrete Interface Bond Behavior Assisted by Digital Image Correlation

Domenico

Quattrocchi

Alizzio

et al. 2021

Sensors

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Digital Image Correlation (DIC) provides measurements without disturbing the specimen, which is a major advantage over contact methods. Additionally, DIC techniques provide full-field maps of response quantities like strains and displacements, unlike traditional methods that are limited to a local investigation. In this work, an experimental application of DIC is presented to investigate a problem of relevant interest in the civil engineering field, namely the interface behavior between externally bonded fabric reinforced cementitious mortar (FRCM) sheets and concrete substrate. This represents a widespread strengthening technique of existing reinforced concrete structures, but its effectiveness is strongly related to the bond behavior between composite fabric and underlying concrete. To investigate this phenomenon, a set of notched concrete beams are realized, reinforced with FRCM sheets on the bottom face, subsequently cured in different environmental conditions (humidity and temperature) and finally tested up to failure under three-point bending. Mechanical tests are carried out vis-à-vis DIC measurements using two distinct cameras simultaneously, one focused on the concrete front face and another focused on the FRCM-concrete interface. This experimental setup makes it possible to interpret the mechanical behavior and failure mode of the specimens not only from a traditional macroscopic viewpoint but also under a local perspective concerning the evolution of the strain distribution at the FRCM-concrete interface obtained by DIC in the pre- and postcracking phase.

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Confinement of reinforced concrete columns with glass fiber reinforced cementitious matrix jackets

Cited by 50 publications

References 38 publications

Mechanical and Material Properties of Mortar Reinforced with Glass Fiber: An Experimental Study

Mechanical and Material Properties of Mortar Reinforced with Glass Fiber: An Experimental Study

Seismic Performance of RC Beam–Column Joints Designed According to Older and Modern Codes: An Attempt to Reduce Conventional Reinforcement Using Steel Fiber Reinforced Concrete

Experimental Characterization of the FRCM-Concrete Interface Bond Behavior Assisted by Digital Image Correlation

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