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Flexural behavior of reinforced concrete beams with cementitious repair materials

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Abstract

There is an urgent need to develop efficient methods for the repairs and rehabilitation of currently existing structures, they are being deteriorated over time, and also the magnitude of loadings keeps rapidly increasing for such structures. Possibly one of the most challenging taks in the rehabilitation processes is to upgrade the overall capacity of deteriorated concrete structures. Recently, considerable efforts are being directed toward developing new construction materials. This paper presents the experimental study for the flexural behavior of reinforced concrete beams repaired by Polymer Cement Mortar (PCM) and Ordinary Portland Cement Mortar (OPCM) in the tension region. Tests were performed for eight reinforced concrete beams with varying reinforcement ratios, repair materials and repair lengths. Emphasis is given to overall bending capacity, deflection, ductility index, failure mode and crack development of repaired beams. The results are compared with those from the control beam.

Résumé

Il est urgent de développer une méthode efficace pour le renforcement et la réparation afin de remettre en état la structure dont le fonctionnement est dégradé en raison de l'accroissement de la charge ou de l'écoulement du temps. Au cours du processus de renforcement, un des paramètres les plus importants est d'améliorer la performance globale des structures en béton endommagées. La tendance d'aujourd'hui est de développer un nouveau matériau. Dans cet article sont menées des études expérimentales sur la flexion de poutres en béton armé réparées ou renforcées avec du mortier de ciment polymère (MCP) et du mortier de ciment portland ordinaire (MCPO) repectivement. Pour des essais, 8 échantillons d'essais ont été fabriqués en variant le rapport d'armature, le matériau de réparation, ainsi que la longueur à réparer, avant de faire les essais. Les résultats confirment: la capacité de la flexion, une flèche, un indice de la ductilité, une rupture apparente, la forme de la fissure des poutres réparées. Et ces résultats ont été comparés avec celui de l'échantillon de référence.

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Abbreviations

A :

the cross-sectional area (cm2)

A s :

the cross-sectional area of reinforcement (cm2)

d :

the effective depth (cm)

ρ:

the reinforcement ratio

μφ :

the ductility index of rotation

μθ :

the ductility index of curvature

μΔ :

the ductility index of deflection

φ y :

the rotation of yield load

φ u :

the rotation of ultimate load

θ y :

the curvature of yield load

θ u :

the curvature of ultimate load

Δ y :

the deflection of yield load

Δ u :

the deflection of ultimate load

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Authors and Affiliations

  1. Department of Civil Engineering, Sungkyunkwan University, 300, Chunchun-Dong, Jangan-Gu, 440-746, Suwon, Kyonggi-Do, Korea

    S. K. Park & D. S. Yang

Authors
  1. S. K. Park
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  2. D. S. Yang
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Park, S.K., Yang, D.S. Flexural behavior of reinforced concrete beams with cementitious repair materials. Mat. Struct. 38, 329–334 (2005). https://doi.org/10.1007/BF02479298

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  • DOI: https://doi.org/10.1007/BF02479298

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