Experimental study of reinforced concrete beam-column joint retrofitted by CFRP grid with ECC and high strength mortar

Lim, Chhoung; Jeong, Yeongseok; Kim, Jinsup; Kwon, Minho

doi:10.1016/j.conbuildmat.2022.127694

Cited by 17 publications

(9 citation statements)

References 33 publications

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“…Their findings indicate that failure mechanism of the specimens may be changed by transferring the load joint to beam and the specimen's strength performance increases. Furthermore, the specimen exhibits enhanced ductility, enabling them to delay the failure [94]. Zuhair Murad et al carried out an experimental study of the cyclic behaviour of retrofitted beam-column joints using FRCM by adopting Ushaped and X-shaped configuration.…”

Section: Strengthening Of Beam-colum Joint Using Frcmmentioning

confidence: 99%

A state of art of review on strengthening of concrete structures using fabric reinforced cementitious matrix

Sagare,

2024

Res. Eng. Struct. Mat.

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Renovation, refurbishment, restoration, and retrofitting of existing structures have grown more challenging issues for the construction profession. Construction buildings are susceptible to damage at the time of the earthquake and need strengthening to enhance their strength, stiffness, and ductility. Fabric-reinforced cementitious matrix (FRCM) techniques have been recently introduced to the construction sector as a feasible solution for fiber-reinforced polymers (FRP) in strengthening application. FRCM composed of high strength fabric grids with cement-based material serve as a binder for FRCM matrices. The binder employed for FRCM composed of cement-based mortar along with polymers are added to improve the bond strength properties. The cementitious matrix utilized in FRCM has superior thermal resistance and better compatibility with the concrete surface. The utilization of FRCM matrix for upgrading and restoring the concrete members is gaining more prominence as a replacement to FRP. This work conducts a thorough analysis of the application of FRCM techniques to concrete structural members like beams, columns, slabs, and beam-column joints. This paper primarily aims to present the FRCM process on structural members and to discuss the flexural, shear, and load carrying FRCM materials that are used in the field.

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Section: Strengthening Of Beam-colum Joint Using Frcmmentioning

confidence: 99%

A state of art of review on strengthening of concrete structures using fabric reinforced cementitious matrix

Sagare,

2024

Res. Eng. Struct. Mat.

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“…Repairing with ECC is less costly than the conventional method and equals approximately 38% of the conventional method. Lim et al [13] studied reinforced concrete beam-column joint retrofitted by carbon fiber reinforced polymer grid covered with ECC and with high-strength mortar. According to the results of the experiments, ECC had higher total energy dissipation and ultimate strength compared to high-strength mortar.…”

Section: Use Of Ecc As a Repair And Retrofit Materialsmentioning

confidence: 99%

“…For example, in the 1990s, U.S. spending on infrastructure repair and reconstruction was around USD 300 billion [6]. In addition, epoxy, silicone-based polymers, and additional reinforcement applications used for repair/retrofit damage the environment and also cause problems such as bonding and poor durability in the beam-column joint [8,13,14]. Studies show that three out of four failures in repaired elements are caused by a lack of repair durability [15,16].…”

Section: Introductionmentioning

confidence: 99%

“…ECC shows a strain-hardening behavior after the first cracking [38] and achieves a tensile strain capacity of 3-5%, about 300-500 times higher than conventional concrete [27,30,[39][40][41]. Moreover, it has a high ultimate tensile strength (5-10 Mpa), modulus of rupture (8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25), fracture toughness (25-30 kJ/m 2 ), and compressive strength (up to 80 MPa) [25]. ECC also has good postcracking resistance and ductility because of the bridging effect of the fibers [42].…”

Section: Introductionmentioning

confidence: 99%

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Application of ECC as a Repair/Retrofit and Pavement/Bridge Deck Material for Sustainable Structures: A Review

2022

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Concrete structures cannot efficiently perform their functions over time due to chemical and physical external effects. Thus, enhancing the relationship between repair and aged structures, and also improving the durability properties of concrete is crucial in terms of sustainability. However, high costs, negative environmental effects, and incompatibility problems occur in repair/retrofit applications. Furthermore, three-quarters of the failures in the repaired/retrofitted structures are caused by a lack of repair durability. The need for repair in pavement/bridge decks is also frequently encountered, and early-age performance problems with repair materials cause pavement/bridge decks to be unavailable for certain periods of time. Engineered Cementitious Composite (ECC) can be effectively used as repair/retrofit and pavement/bridge deck material. It also has a minimal need for repair/retrofit thanks to its high durability properties. This article presents state-of-the-art research regarding the application of ECC as a repair/retrofit and pavement/bridge deck material. Studies in the literature show that the repair/retrofit properties of ECC outperform conventional concrete and steel fiber-reinforced concrete. ECC can be a solution to high early strength and drying shrinkage problems frequently encountered in the use of repair materials. It could also be used for different repair applications such as cast, sprayed, and trenchless rehabilitation. Moreover, ECC might fulfill specific requirements for pavement, pavement overlay, tunnel pavement, airfield pavement, and bridge deck. These superior performances are attributed to ECC’s kink-crack trapping mechanism, uniquely large inelastic strain capacity, strain hardening, high tensile strain capacity, and multiple microcracking and ductile behaviors, especially bonding behavior and self-healing.

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“…ECC (Engineered Cementitious Composite) materials have ultra-high toughness and provide sufficient bonding force when reinforced, and also solve the problem of poor durability performance of organic interface paste, which can effectively inhibit cracking [11][12][13]. Existing studies have confirmed that the application of ECC material to concrete structure reinforcement can improve the flexural load capacity of the beam [14][15][16].The combination of the ECC layer and the steel plate on the RC beam significantly delayed the formation and development of cracks, thereby enhancing the overreinforcement of the steel RC beams, as well as increasing their flexural capacity and ductility [17]. Hamoda tested and numerically analyzed the concrete beams strengthened with ECC and stainless steel strip.The experimental results demonstrated that hybrid SS-ECC strengthening can improve the ultimate capacity of NC beams by as much as 156% [18].…”

Section: Introductionmentioning

confidence: 99%

Finite element analysis on flexural performance of the bending capacity for concrete beams reinforced with ECC and aluminum alloy bars

Mo,

Huang,

Huang

et al. 2023

HSET

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The flexural performance of concrete beams reinforced by engineered cementitious composites (ECC) and embedded aluminum alloy bars was analyzed by finite element method, and compared the results with the existed experimental values to verify the correctness of the finite element model. On this basis, the effects of different ECC reinforcement thickness, the number of aluminum alloy reinforcement roots and the diameter of aluminum alloy reinforcement on improving the flexural performance of the reinforced beams were studied. The results showed that: ECC-aluminum alloy bars reinforcement can significantly improve the flexural performance of reinforced concrete beams, and the ultimate load capacity of reinforced beams was improved by 5.88%~73.66% compared with that of control beams; the effect of ECC-aluminum alloy bars reinforcement method was better than that of reinforcement with ECC material only; the degree of improvement of yield load of beams by ECC reinforcement layer was greater than that of ultimate load; The thickness of ECC reinforcement layer, the number of aluminum alloy reinforcement roots and diameter were proportional to the reinforcement effect of reinforced beams, among which increasing the number of aluminum alloy reinforcement roots had a great influence on the flexural load capacity of reinforced beams, which provided for the calculation of flexural performance of reinforced concrete structures.

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Experimental study of reinforced concrete beam-column joint retrofitted by CFRP grid with ECC and high strength mortar

Cited by 17 publications

References 33 publications

A state of art of review on strengthening of concrete structures using fabric reinforced cementitious matrix

A state of art of review on strengthening of concrete structures using fabric reinforced cementitious matrix

Application of ECC as a Repair/Retrofit and Pavement/Bridge Deck Material for Sustainable Structures: A Review

Finite element analysis on flexural performance of the bending capacity for concrete beams reinforced with ECC and aluminum alloy bars

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