Flexural behaviour of corroded reinforced concrete beams repaired with ultra-high toughness cementitious composite

Hou, Lei; Jin, Wang; Huang, Ting; Shen, Chun; Aslani, Farhad; Chen, Da

doi:10.1016/j.conbuildmat.2019.03.214

Cited by 35 publications

(9 citation statements)

References 35 publications

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“…The aforementioned literature review reveals that the majority of the conducted research is focused on the application of nonconventional jackets in strengthening methods of original RC structural members [17][18][19]21,22,24,[26][27][28][30][31][32][33][34]36,[38][39][40][41][42][43][44][45][48][49][50]56]. Significantly fewer studies investigate such jackets for the repair of preloaded and slightly damaged RC specimens [20,23,25,29,35,37,46,47,[51][52][53][54][55].…”

Section: Research Significancementioning

confidence: 99%

“…These reasons have led researchers to switch to new jacketing techniques with alternative materials such as steel [17][18][19], advanced materials such as fiber reinforced polymer (FRP) [20][21][22][23][24][25], textile reinforced concrete or mortar [26][27][28][29] and shape memory alloys [30][31][32], cement-based materials such as ferrocement [33][34][35][36], steel fibrous concrete or mortar [37][38][39][40], high-performance fiber reinforced concrete [41][42][43][44][45][46][47][48], self-compacting concrete (SCC) [49][50][51][52][53][54], and thin slightly reinforced flowable mortar [55,56]. Many of these jacketing techniques have been proved successful substitutes to common RC jacketing.…”

Section: Introductionmentioning

confidence: 99%

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Repair of Heavily Damaged RC Beams Failing in Shear Using U-Shaped Mortar Jackets

et al. 2019

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The effectiveness of slightly reinforced thin U-shaped cementitious mortar jacketing for the repair of damaged shear-critical reinforced concrete beams is experimentally investigated. The test project includes two parts. In the first one, five concrete beams over-reinforced against flexure and under-reinforced against shear with different ratio of closed stirrups were initially subjected to monotonic loading until failure. The initially tested beams have been designed to fail in shear after wide diagonal cracking and to exhibit various strength and deformation capacities along with different levels of damages. In the second experimental part, the heavily damaged beams were jacketed with mild steel small diameter U-shaped transverse stirrups and longitudinal reinforcing bars. The retrofitted specimens using the proposed jacketing technique were tested again following the same four-point-bending load scheme. Based on the overall performance of the beams, it is deduced that the shear strength and deformation capability of the jacketed beams were substantially increased compared to the corresponding capacities of the initial beams. Further, although all beams failed in a shear abrupt manner, the retrofitted ones exhibited reduced brittleness and higher deflections at failure up to six times with respect to the initially tested specimens. The level of the initial damage influences the efficiency of the jacketing. Additional test data derived from relative shear-damaged beam specimens and retrofitted with similar thin jackets is also presented herein in order to establish the effectiveness of this repair system and to clarify the parameters affecting its structural reliability. Comparisons indicated that jacketed beams can alter the failure mode from brittle shear to ductile flexural under certain circumstances.

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Section: Research Significancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Repair of Heavily Damaged RC Beams Failing in Shear Using U-Shaped Mortar Jackets

et al. 2019

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“…The results demonstrated that strengthened beams' failure load and rigidity enhanced up to 39.44% and 127.57%, respectively, compared with the control corroded beams. Hou et al 29 investigated the flexural behavior of corroded RC beams repaired with ultrahigh toughness cementitious composite (UHTCC). The results indicated that using UHTCC could improve the capacity at corrosion ratios by 11.2%.…”

Section: Introductionmentioning

confidence: 99%

Strategies for strengthening of corroded reinforced concrete beams using CFRP laminates and UHPC jacketing

Al‐Osta

Kharma

Ahmad

et al. 2022

Structural Concrete

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This article aims to investigate the flexural behavior of strengthened corroded reinforced concrete (RC) beams using carbon fiber‐reinforced polymer (CFRP) laminates and using a hybrid system of CFRP laminates and ultrahigh‐performance concrete (UHPC) layers. A total of 15 RC beam specimens were prepared, out of which one specimen was uncorroded–unstrengthened, and 14 specimens were corroded using accelerated corrosion set up to cause a significant reduction in the load‐carrying capacity of the RC beams. The damaged covers of the corroded RC beam specimens were first repaired and then strengthened with different strengthening strategies involving CFRP laminates alone as well as the CFRP laminates and UHPC jacketing together. The experimental results obtained by testing the strengthened RC beam specimens in flexure showed a significant enhancement in the load‐carrying capacity and stiffness of the strengthened corroded RC beams. The number of CFRP laminates, hybridization of the CFRP laminates and UHPC layer, and the thickness of the UHPC layer all significantly improved the load‐carrying capacity and stiffness of the strengthened corroded RC beams indicating the possibility of selecting an optimal strategy out of different options for strengthening the corroded beams to achieve a targeted degree of the efficacy of the strengthening. The analytical model developed in this study to estimate the flexural capacity of the strengthened RC beams was found to predict the values of the load‐bearing capacity of the RC beams strengthened using different strategies very close to their respective experimental values.

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“…A significant amount of work has been devoted to the study of reinforcing damaged elements. In particular, Kabir M. et al [7] investigated the operation of reinforced beams by using CFRP; Burningham C. et al [8] investigated the operation of reinforced beams by using the Steel Tendons Using Post-Tensioned Carbon Fiber-Reinforced Polymer Rods; Hou L. et al [9] investigated the operation via reinforced beams repaired with ultra-high toughness cementitious composite.…”

Section: Introductionmentioning

confidence: 99%

Research of the Residual Bearing Capacity and the Work of Damaged Reinforced Concrete Beams’ Inclined Sections

Kos

Klymenko

Polianskyi

et al. 2020

Teh. glas. (Online)

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The article is devoted to studies about the stress-strain state and the residual bearing capacity of inclined sections of reinforced concrete beams with concrete damages in the compressed zone near support areas. The developed method of calculating the bearing capacity of the inclined sections of damaged beams is described. The numerical test of prototypes was performed in the LIRA-CAD 2017 software complex. A comparison of the results of laboratory tests, a numerical experiment and calculation results by the proposed method is shown. It is stressed that with an increase in the area of damage, the bearing capacity decreases. The nature of the change in the stress-strain state under the presence of damage is described. It is pointed out that in the damaged samples, there is an inclination of the neutral axis in the cross section of the element – it tilts, the neutral axis becomes, almost, parallel to the front of the damage.

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Flexural behaviour of corroded reinforced concrete beams repaired with ultra-high toughness cementitious composite

Cited by 35 publications

References 35 publications

Repair of Heavily Damaged RC Beams Failing in Shear Using U-Shaped Mortar Jackets

Repair of Heavily Damaged RC Beams Failing in Shear Using U-Shaped Mortar Jackets

Strategies for strengthening of corroded reinforced concrete beams using CFRP laminates and UHPC jacketing

Research of the Residual Bearing Capacity and the Work of Damaged Reinforced Concrete Beams’ Inclined Sections

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