Experimental investigations of reinforced concrete beams repaired/reinforced by TRC composites

Truong, Ba Tam; Bui, Tan Trung; Limam, A.; Larbi, Amir Si; Le-Nguyen, Khuong; Michel, Marie

doi:10.1016/j.compstruct.2017.02.080

Cited by 35 publications

(10 citation statements)

References 18 publications

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“…The results from Verbruggen et al 9 showed that the TRC reinforcement layer had good crack bridging ability and its application on the full width of a beam was beneficial to bearing capacity improvement and crack width limitation. The experimental results of Truong et al 10 showed that the reinforcement effect of TRC was good and that it would not be affected by the precracking of the beam. Xu et al 11 studied the mechanical properties of TRC-strengthened beams with a secondary load under conventional conditions.…”

Section: Introductionmentioning

confidence: 96%

Flexural properties of load-holding reinforced concrete beams strengthened with textile-reinforced concrete under a chloride dry–wet cycle

Yin

2019

Journal of Engineered Fibers and Fabrics

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To study the reinforcement effect of textile-reinforced concrete (TRC) on concrete structures in a marine environment, a four-point bending loading method was used for graded loading to analyze the influence of the dry-wet cycle number, the reinforcement method, and chopped fiber addition on the flexural properties of load-holding reinforced concrete beams reinforced with textile-reinforced concrete. The results show that with the increase of dry-wet cycle numbers, the crack width and deflection of beams develop faster and the bearing capacity decreases. The performance of the prefabricated textile-reinforced concrete plate is close to that of a cast-in-place textile-reinforced concrete in limiting crack, bearing capacity, and deflection deformation. The addition of chopped fibers in fine-grained concrete can improve the reinforcement effect of textile-reinforced concrete. Based on the experimental results and referring to the relevant design codes and literature, the calculation formula of the bearing capacity of TRC-strengthened beam with a secondary load is established, and the calculated values are in good agreement with the actual values.

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Section: Introductionmentioning

confidence: 96%

Flexural properties of load-holding reinforced concrete beams strengthened with textile-reinforced concrete under a chloride dry–wet cycle

Yin

2019

Journal of Engineered Fibers and Fabrics

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“…The effectiveness of FRCM strengthening method is significantly affected by characteristics of fabric [16,17], impregnation quality of matrix into fabric [18], and coating condition of fabric [19]. Truong et al [20] tested twelve RC beams strengthened with FRCM, and reported that externally applied FRCM layer can increase the ultimate load of RC beams by 27%. Aljazaeri et al [21] evaluated the structural performance of FRCM-strengthened beams with glass spike or U-wrapped anchorage system.…”

Section: Introductionmentioning

confidence: 99%

Flexural strengthening of reinforced concrete beams using fabric reinforced Alkali-Activated Slag matrix

Shen

Chen

et al. 2021

Journal of Building Engineering

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Old Reinforced Concrete (RC) buildings are facing different degrees of structural deterioration and require proper strengthening to enhance their structural performance as well as to extend their life span. Fabric reinforced Alkali-Activated Slag (AAS) matrix is proposed to strengthen RC beams in this study. Seven RC beams with and without strengthening were prepared and tested under four-point bending. Test results indicate that use of AAS matrix as replacement for conventional cement-based matrix can change the failure mode of the strengthened beams from end-debonding of strengthening layer to slippage combined with rupture of fabric. The AAS-based strengthening strategy is able to enhance the loading capacity and flexural stiffness of RC beams as well as to reduce the strain of tensile reinforcements. Except the specimens failed in the premature debonding, increasing the fabric amount in the strengthening scheme improves the loading capacity of beams. In an optimal case, the yielding and ultimate loads of the strengthened beams are enhanced by 22.2% and 26.4%, respectively. Moreover, an analytical model was developed to predict the characteristic loads of the fabric reinforced AAS matrix strengthened beams. It shows that the analytical model could overestimate the yielding and ultimate loads of the strengthened beams, probably due to slippage and reduced synergistic effect of fabric bundles in the strengthening system. Based on that, two efficiency factors of 0.35 and 0.25, taking account of the area of effective fabric, are obtained and recommended to estimate the yielding and ultimate loads of fabric reinforced AAS matrix-strengthened beams, respectively.

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“…For these reasons, the bonding behavior at the interface may deteriorate rapidly if existing concrete structures lie in harsh environments, such as over-high/low temperature, in the presence of moisture, or even near fire and underwater. Therefore, some scholars have suggested replacing the epoxy systems with some inorganic cementitious materials to develop two major strengthening systems which combine FRP composites and cement-based materials [31], namely FRP sheets/plates bonded with a cementitious material [32] Some strengthening and retrofitting materials have been developed for existing concrete structures in the last decade, including textile reinforced mortar (TRM) [1][2][3][4][5][6], fiber reinforced cementitious matrix (FRCM) [7][8][9][10][11][12], textile reinforced concrete (TRC) [13][14][15][16], steel-reinforced grout (SRG) [17,18], and fiber reinforced polymer (FRP) composites [19][20][21][22][23][24][25]. Among them, fiber reinforced polymer (FRP) composites, including FRP sheets, FRP plates, FPR grids, and so forth, have been demonstrated to be an effective solution due to their favorable and prominent properties (e.g., light weight, high tensile strength, excellent corrosion resistance, and durability in harsh environments) [26,27].…”

Section: Introductionmentioning

confidence: 99%

“…To replace the effective strain corresponding to the FRP rod, the ultimate strain value of the FRP grid (ε u,grid ) has been defined as the measured ultimate or debonding strain of the CFRP grid (also called effective strain of CFRP grid [38,40]) and has been explored through regression analysis, in two series of tests. The analysis is shown in Figure 12 and the result is given as: ε u,grid = 1 0.0352ρ g + 0.0079 2 × 10 −6 (13) where ρ g is defined as the cross-sectional area of the CFRP grid per unit length in the horizontal direction. where ρg is defined as the cross-sectional area of the CFRP grid per unit length in the horizontal direction.…”

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confidence: 99%

Experimental Study on Shear Strengthening of RC Beams with an FRP Grid-PCM Reinforcement Layer

et al. 2019

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This paper investigates the shear strengthening effect of a number of reinforced concrete (RC) beams strengthened by a reinforcement layer which combines carbon fiber reinforced polymer (CFRP) grid and polymer cement mortar (PCM). A total of ten RC beams, including three types of specimens as Series A and seven kinds of specimens as Series B, were prepared and investigated. The test variables in both series of experiments included various reinforcement ranges and different reinforcement amounts that consisted of CFRP grids’ spacing and cross-section areas. The experimental results suggest that the shear strengthening effect of the CFRP grid-PCM layer for RC beams is obvious and adequate. Meanwhile, better performance is observed if the CFRP grid-PCM reinforcement layer is used for the full sectional reinforcement of RC beams with an I-shaped profile, in contrast to RC beams with reinforcement of the web only. In addition, a new evaluation method based on the effective strain of the CFRP grid is developed to determine the shear capacity of RC beams strengthened by a CFRP grid-PCM layer.

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Experimental investigations of reinforced concrete beams repaired/reinforced by TRC composites

Cited by 35 publications

References 18 publications

Flexural properties of load-holding reinforced concrete beams strengthened with textile-reinforced concrete under a chloride dry–wet cycle

Flexural properties of load-holding reinforced concrete beams strengthened with textile-reinforced concrete under a chloride dry–wet cycle

Flexural strengthening of reinforced concrete beams using fabric reinforced Alkali-Activated Slag matrix

Experimental Study on Shear Strengthening of RC Beams with an FRP Grid-PCM Reinforcement Layer

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