RC Slabs Repaired and Strengthened by Alumina/Polymer Mortar and Prestressing Strands in the Tension Zone: Experimental Investigation Under Static and Fatigue Loadings

Han, Kyoung-Bong; Hong, Sung-Jong; Park, S. K.

doi:10.1007/s11029-012-9303-5

Cited by 7 publications

(5 citation statements)

References 19 publications

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“…De acordo com a literatura, esta dispersão pode ser explicada porque o concreto é um material heterogêneo, sendo assim a tensão de ruptura varia de um corpo de prova para o outro e, como não é possível ensaiar o mesmo corpo de prova que foi rompido, para determinar a resistência à flexão simples sob carga centrada, a relação entre tensões varia ainda mais de uma amostra para a outra. Talvez, devido a este problema, alguns autores optam por aplicar tensões mais baixas, com ciclos pré-estabelecidos, e apresentam medidas de deformação sem ruptura dos corpos de prova [16,19,23].…”

Section: Figura 8: Resultados Do Ensaio De Fadigaunclassified

Estudo do comportamento mecânico do concreto com borracha de pneu

et al. 2016

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RESUMOEste estudo trata da análise das propriedades mecânicas do concreto, elaborado a partir da substituição de parte do agregado miúdo por borracha de pneu triturado. Foram realizados testes experimentais em corpos de prova submetidos à compressão axial, flexão simples sob carga centrada e fadiga. As medições foram feitas em três traços de concreto: 1) concreto sem borracha (denominado na presente pesquisa por concreto de referência); 2) concreto com borracha e consumo de cimento igual ao de referência; e 3) concreto com borracha e acréscimo de cimento até a obtenção da resistência do concreto de referência. Os resultados obtidos mostram que a adição de borracha provoca redução na resistência mecânica do concreto, o que pode reduzir as aplicações deste novo material. A presença da borracha também conferiu um menor módulo de elasticidade ao concreto, o que pode ser desejável em situações envolvendo ações de impacto, forças dinâmicas e fadiga. Além dessa vantagem, a aplicação da borracha de pneu no concreto contribui na reciclagem de um material poluente e que normalmente é descartado no meio ambiente. Palavras-chave: concreto; borracha de pneu; propriedades mecânicas. ABSTRACTThis study discusses the mechanical properties of concrete, elaborated from the partial replacement of fine aggregate by crushed rubber. It was made experimental tests in specimens submitted to axial compression, Young's modulus (stiffness), three-point bending flexural and fatigue. The measurements were performed on three mixtures: 1) concrete without rubber (denominated as reference concrete), 2) concrete with rubber and the consumption of cement equal of reference and 3) concrete with rubber and the addition of cement on the mixture until it obtains the same strength of the reference concrete. The results have indicated that adding rubber in concrete decreases the strength, which could reduce the application of this new material. The rubber also decreased the elastic modulus; this could improve the behavior of materials in situations involving impact actions, dynamics loads and fatigue. Furthermore, this new composite contributes on rubber tire recycling processes.

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Section: Figura 8: Resultados Do Ensaio De Fadigaunclassified

Estudo do comportamento mecânico do concreto com borracha de pneu

et al. 2016

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“…These factors occur as a result of various changes in the external environment, such as the increased service life and climate change. 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].…”

Section: Introductionmentioning

confidence: 99%

“…Water-mortar ratio; 2 Silica sand;3 Polyvinyl alcohol fiber;4 Hexacalcium hexaoxotris expansive admixture.…”

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confidence: 99%

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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“…Structural engineers have extensive experience of repairing concrete structures above water [3][4][5][6]. The conventional approach to the repair of reinforced concrete columns that have shallow damages, however, is to use patch repair for the damaged zones where cracking and spalling occur [7,8].…”

Section: Introductionmentioning

confidence: 99%

Behavior of Concrete Columns Repaired with Polymer Mortar and Epoxy Fiber Panel

Hong

Park

2013

Advances in Materials Science and Engineering

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Underwater structures are not easy to check for the degree of damage or to repair and strengthen damaged regions. Even during repair and strengthening, quality control is very difficult, because the work is done under water. Moreover, underwater structures severely deteriorate, owing to special environmental conditions. If this deterioration continues, the structures face serious structural problems, because of the corrosion of steel rods and the loss of concrete sections. Repairing or strengthening underwater structures requires effective, economic underwater repair and reinforcement techniques that allow the same working conditions as on the ground while maintaining dry condition for the repair sections. However, systematic studies on the repair and strengthening techniques for underwater structures are insufficient. This study proposes a new repair method for underwater structures, which applies epoxy fiber panel forms and shear connectors. To demonstrate the repair effects, this study compared and evaluated the failure modes and repair effects by the surface condition of repair sections, by applying various repair methods, in consideration of the ground and underwater conditions.

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RC Slabs Repaired and Strengthened by Alumina/Polymer Mortar and Prestressing Strands in the Tension Zone: Experimental Investigation Under Static and Fatigue Loadings

Cited by 7 publications

References 19 publications

Estudo do comportamento mecânico do concreto com borracha de pneu

Estudo do comportamento mecânico do concreto com borracha de pneu

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

Behavior of Concrete Columns Repaired with Polymer Mortar and Epoxy Fiber Panel

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