Strengthening of Concrete Structures with Textile Reinforced Mortars:                    State-of-the-Art Review

Koutas, Lampros N.; Tetta, Zoi; Bournas, Dionysios A.; Triantafillou, Thanasis

doi:10.1061/(asce)cc.1943-5614.0000882

Cited by 316 publications

(178 citation statements)

References 103 publications

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“…In all specimens, except ARLo1P and ARLo2, more than 50% of the cracks occurred in the pure bending section. This result indicates that TRM strengthening is advantageous for the uniform distribution of cracks [7,35,38,41]. In the ARLo2 specimen, the ratio of the cracks in pure bending decreased.…”

Section: Experiments Results and Discussionmentioning

confidence: 82%

“…In Table 5, Lo represents the low textile reinforced, O represents the over textile reinforced, and P represents the prestressed specimen. The strengthening process of the TRM specimen was as follows [38]: (1) the bottom surface of the RC beam was ground with a grid of grooves with of 2-3 mm depth; (2) the RC beam was set up on a strengthening device; (3) a primer was applied; (4) 6-mm-thick polymer mortar was poured using a trowel; (5) the textile was placed and pressed into the mortar for the non-prestressed specimens, whereas the textile was fixed on the clamp device at each side for the prestressed specimen; (6) the textile was prestressed parallel to the reinforcing axis to 5% of the tensile strength for the prestressed specimens; (7) a second layer of 6 mm thick polymer mortar was poured, and hand pressure was applied to cause the mortar to penetrate the textile; (8) steps (5)- (7) were repeated until all the designed textile layers were placed; (9) 6-mm-thick mortar was poured after the last textile was placed; (10) the prestressed TRM-strengthened beam specimen was cured for one day with the textiles fixed by using anchors and clamps.…”

Section: Specimens and Test Set-upmentioning

confidence: 99%

“…Substantial financial resources are required in repairing and strengthening the performance and durability of structures [1], and several researchers have investigated various repair/strengthening methods [2][3][4][5][6]. The textile-reinforced mortar (TRM) method is a structural strengthening method that involves producing textiles with an excellent tensile strength and chemical resistance, such as carbon, alkali-resistant-(AR-) glass, aramid, and basalt fiber, and attaching these materials onto the surface of the concrete structure using mortar, an inorganic material [7]. Unlike fiber-reinforced polymers, which reinforce fibers using polymer materials, textiles are composed of fibers, therefore, they have free formability and are applicable to various structures, including arches, columns, beam-column joints, and masonry structures [8].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental Study of Flexural Behavior of Reinforced Concrete Beam Strengthened with Prestressed Textile-Reinforced Mortar

Park

Hong

2020

Materials

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In this study, nine specimens were experimentally tested to analyze the strengthening efficiency of textile-reinforced mortar (TRM) and the difference in flexural behavior between prestressed and non-prestressed TRM-strengthened reinforced concrete beam. The test results show that TRM strengthening improves the flexural strength of TRM-strengthened reinforced concrete beams with alkali-resistant-(AR-) glass textile as well as that with carbon textile. However, in the case of textile prestressing, the strengthening efficiency for flexural strength of the AR-glass textile was higher than that of the carbon textile. The flexural stiffness of AR-glass textiles increased when prestressing was introduced and the use of carbon textiles can be advantageous to reduce the decreasing ratio of flexural stiffness as the load increased. In the failure mode, textile prestressing prevents the damage of textiles effectively owing to the crack and induces the debonding of the TRM.experimentally study for the bond was conducted and effective anchorage length was derived for fibers/matrix interface [13], and the bond-slip relation was predicted considering the loss of bond between PBO-FRCM system and the concrete substrate [14]. The flexural behavior of the structure which was strengthened with TRM was also investigated [15][16][17][18][19][20][21][22][23][24]. Herbrand et al.[25] applied a carbon textile-reinforced mortar to real bridge. The experimental results indicated increasing the fatigue and ultimate strength of bridge. Koutas et al. [7] reported the state-of-the-art review on the strengthening of concrete structure with TRM including studies for flexural, shear, confinement, and seismic retrofitting.The designing and strengthening of TRM, however, is still difficult because such an uncertainty involves errors that may occur during weaving, material application, and the construction process. Theoretical studies were conducted to predict the flexural strength of TRM-strengthened RC beam [17,18,20,24]. An efficient factor is applied in the designing of strengthening TRM to consider the poor bond between textile and mortar [26,27]. ACI Committee 549 [28] proposes an effective tensile strain to limit the ultimate tensile strain of fabric-reinforced cementitious matrix (FRCM). Flexural strength was predicted according to ACI 549.4R and the results underestimated the experimental results [19,29].A method of manually stretching the textile or fixing both sides of the textile was adopted during the construction stage to reduce this uncertainty regarding TRM strengthening [15,27]. The method of stretching and fixing the textiles has the advantages of preventing the local bending of the textiles, which can occur when the textiles are placed on the mortar, and accurately maintaining the reinforced axis [27,30]. This method, however, has a disadvantage: the axial load applied to the textile is not constant. Consequently, some researchers analyzed the performance of a structure by introducing a prestress to the textile [31][32][33][34][...

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Section: Experiments Results and Discussionmentioning

confidence: 82%

Section: Specimens and Test Set-upmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental Study of Flexural Behavior of Reinforced Concrete Beam Strengthened with Prestressed Textile-Reinforced Mortar

Park

Hong

2020

Materials

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“…Another method that has become increasingly established over the past 20 years is strengthening with textile reinforced concrete (abbreviated: TRC; also known as textile reinforced mortar, abbreviated: TRM, or fibre-reinforced cementitious matrix (abbreviated: FRCM) composites) [19][20][21][22][23][24]. Similar to shotcrete, TRC is-from the material's side-very compatible with the steel reinforced concrete of the primary building element.…”

mentioning

confidence: 99%

“…TRC can be used to increase the bending, torsional, longitudinal, and shear load-bearing capacity and to improve serviceability and functionality, e.g., References [22,24]. In this article, the focus lies on a model to calculate the increase of the flexural load-carrying capacity due to an additional TRC layer.…”

mentioning

confidence: 99%

Flexural Strengthening of RC Structures with TRC—Experimental Observations, Design Approach and Application

et al. 2019

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Today, the need for structural strengthening is more important than ever. Flexural strengthening with textile reinforced concrete (TRC) is a recommendable addition to already proven methods. In order to use this strengthening method in construction practice, a design model is required. This article gives a brief overview of the basic behavior of reinforced concrete slabs strengthened with TRC in bending tests as already observed by various researchers. Based on this, a design model was developed, which is presented in the main part of the paper. In addition to the model, its assumptions and limits are discussed. The paper is supplemented by selected application examples to show the possibilities of the described strengthening method. Finally, the article will give an outlook on open questions and current research.

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Nachweise im Grenzzustand der Tragfähigkeit

Bergmann¹,

Bielak²,

Bosbach³

et al. 2023

Handbuch Carbonbeton

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Strengthening of Concrete Structures with Textile Reinforced Mortars: State-of-the-Art Review

Cited by 316 publications

References 103 publications

Experimental Study of Flexural Behavior of Reinforced Concrete Beam Strengthened with Prestressed Textile-Reinforced Mortar

Experimental Study of Flexural Behavior of Reinforced Concrete Beam Strengthened with Prestressed Textile-Reinforced Mortar

Flexural Strengthening of RC Structures with TRC—Experimental Observations, Design Approach and Application

Nachweise im Grenzzustand der Tragfähigkeit

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