Materials for the repair and protection of concrete

Robery, Peter; Shaw, J D N

doi:10.1016/s0950-0618(97)00048-2

Cited by 13 publications

(4 citation statements)

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“…Compatibility of the repair material with the existing substrate is an important consideration if the repair is to withstand all the stresses induced by the influences, such as volume changes and chemical/electrochemical effects. Several types of concrete repair materials [8,11,20,21] have been introduced and used through years. These have ranged from polymer modifiers for Portland cement based products to pure polymers such as epoxy resins and polysters based systems.…”

Section: Introductionmentioning

confidence: 99%

Corrosion degradation and repair of a concrete bridge

Guettala

Abibsi

2006

Mater Struct

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Reinforced concrete corrosion has been widely reported in the literature over the last two to three decades even though certain cement concrete works remain in excellent state after more than one century of exposure to severe climatic conditions. This type of damage is responsible for the huge financial costs spent each year on the repair of deteriorated structures all over the world. This article describes the diagnosis carried out on the degradation of a reinforced concrete bridge put into service only 20 years back as well as the follow up repair. The stages of repair and reinforcement are discussed as well as its state after repair. The processes leading to damage and necessary repair strategies and procedures to avoid further damage under the given environmental conditions were obviously not understood by the designers of the repair works. It's also shown in this study the importance of maintenance and regular inspection of a given cement concrete work or the lack of it as is the case. Résumé La corrosion du béton armé aété largement reportée dans la littérature pour les deux dernières décennies malgré que certaines structures en béton armé demeurent dans unétat excellent après plus d'un siècle d'exposition aux conditions climatiquesA. Guettala · A. Abibsi Faculty of Engineering Biskra University -Algeria sévères. Ce type d'endommagement est responsable des coûts financiersénormes dépensées chaque année dans la réparation des structures détérioréesà travers le monde. Cet article décrit le diagnostique fait sur la dégradation d'un pont en béton armé mis en service il y'a seulement 20 années ainsi que le suivi après réparation. Les causes principales de la dégradation ainsi que les différentesétapes de réparation et le renforcement sont décrites et discutées. Des processus causant des endommagements et des stratégies nécessaires de réparation pouréviter encore plus de détérioration sous des conditions environnementales données n'étaient pas bien cernées par les concepteurs de ces travaux de réparation. Cetteétude a montré aussi l'importance de la maintenance et de l'inspection régulière ou plutôt leur absence comme c'est le cas.

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Section: Introductionmentioning

confidence: 99%

Corrosion degradation and repair of a concrete bridge

Guettala

Abibsi

2006

Mater Struct

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“…Focusing on mortar with polymers, their properties are influenced by the cement hydration, the association between the organic and inorganic phases and the distribution of the polymer in mortar (Xiang-Ming, 2013;Xiang-Ming et al, 2013). Studies have shown that mortars with polymers tend to be more ductile than cement mortars; their lower elasticity modulus produces a smaller risk of cracking by retraction, thus avoiding the formation of cracks at the repair concrete-mortar interphase and they increase durability (Ming-Gin et al, 2007;Phoo-ngernkham et al, 2015;Metcherine, 2013;Pascal et al, 2004;Shash, 2005;Hassan et al, 2001;Cabrera & Al-Hasan, 1997;Mangat & Limbachiya, 1997;Robery & Shaw, 1997;Medeiros et al, 2009). Another aspect to be considered, is curing and its influence on the repair concrete-mortar bonding, being necessary to control the humidity in the interphase since it can affect hydration and produce high porosity in the area (Zhou & Van Breguel, 2016;Rashid et al, 2015).…”

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confidence: 99%

Comportamiento mecánico de secciones de hormigón y mortero = Mechanical behavior of concrete-mortar sections

Casal

Escamilla

Fernández

et al. 2018

ADE

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ResumenEl objetivo del presente trabajo es comparar el comportamiento de los elementos estructurales sometidos a flexión o compresión después de haber sido reparados, mediante la sustitución del hormigón deteriorado por mortero de cemento Portland o mortero modificado con polímeros. En primer lugar, las probetas cúbicas se fabricaron con diferentes proporciones de reparación de mortero de cemento para ensayar a compresión, con los materiales colocados tanto en serie como en paralelo. Del análisis de resultados, se puede concluir que los sistemas mixtos - mortero de hormigón modificado con polímeros sometido a compresión pueden soportar cargas mayores que la reparación del mortero de cemento Portland, aunque en ningún caso pueden restaurar la capacidad de carga del hormigón. En los elementos sometidos a flexión, las vigas reparadas pueden alcanzar la resistencia inicial a la fractura de las vigas y soportar cargas aún mayores. Por lo tanto, la reparación de estructuras de cemento deterioradas con morteros de reparación es una buena alternativa, especialmente en elementos estructurales sometidos a flexión, y se realizan con morteros de cemento Portland. En las estructuras sometidas a compresión, es mejor utilizar morteros de reparación modificados con polímeros que aumentan la ductilidad cuando el mortero de reparación se ubica en serie con respecto a la carga.AbstractThe aim of the present work is to compare the behavior of structural elements subjected to bending or compression after having been repaired, by substituting the deteriorated concrete by Portland cement mortar or mortar modified with polymers. Firstly, cubic specimens were manufactured with different repair concrete-mortar proportions to be tested to compression, with the materials placed both in series and in parallel. From the results analysis, it can be concluded that mixed systems - polymer-modified concrete mortar subjected to compression can withstand greater loads than the repair Portland cement mortar, although they are in no case able to restore the load capacity of concrete. In elements subjected to bending, the repaired beams are able to achieve the initial fracture strength of the beams, and support even higher loads. Therefore, repairing deteriorated concrete structures using repair mortars is a good alternative, especially in structural elements subjected to bending, and performed using Portland cement mortars. In structures subject to compression, it is better to use repair mortars modified with polymers which increase the ductility when the repair mortar is located in series regarding the load

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“…A seleção dos produtos a serem utilizados em reparos, tem sido regularmente baseada em propriedades mecânicas de duvidosa coerência, ao invés de uma análise com critérios adequados 10 .…”

Section: Justificativa E Importânciaunclassified

Estudo da fissuração associada à retração em argamassas para reparo em estruturas de concreto.

Peña¹,

Ramón²

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Materials for the repair and protection of concrete

Cited by 13 publications

References 0 publications

Corrosion degradation and repair of a concrete bridge

Corrosion degradation and repair of a concrete bridge

Comportamiento mecánico de secciones de hormigón y mortero = Mechanical behavior of concrete-mortar sections

Estudo da fissuração associada à retração em argamassas para reparo em estruturas de concreto.

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