Reinforced concrete repairs in beams

Nounu, Ghassan; Chaudhary, Zia-UL-Hasan

doi:10.1016/s0950-0618(99)00014-8

Cited by 21 publications

(9 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The positive terminal of this DC power supply is connected to the rebar making it act as anode, while the negative terminal is connected to a counter electrode becoming a cathode. The counter electrode could be in the form of an internal bar [45], external mesh [46], or external plate [41,47]. The concrete specimens should be partially immersed in sodium chloride (NaCl) solution in a suitable tank, where the NaCl solution is in direct contact with the bottom of the structure.…”

Section: Introductionmentioning

confidence: 99%

Experimental Assessment of Rebar Corrosion in Concrete Slab Using Ground Penetrating Radar (GPR)

Zaki

Johari

Hussin

et al. 2018

International Journal of Corrosion

View full text Add to dashboard Cite

Corrosion of steel reinforcement is a major cause of structural damage that requires repair or replacement. Early detection of steel corrosion can limit the extent of necessary repairs or replacements and costs associated with the rehabilitation works. The ground penetrating radar (GPR) method has been found to be a useful method for evaluating reinforcement corrosion in existing concrete structures. In this paper, GPR was utilized to assess corrosion of steel reinforcement in a concrete slab. A technique for accelerating reinforcement bar corrosion using direct current (DC) power supply with 5% sodium chloride (NaCl) solution was used to induce corrosion to embedded reinforcement bars (rebars) in this concrete slab. A 2 GHz GPR was used to assess the corrosion of the rebars. The analysis of the results of the GPR data obtained shows that corrosion of the rebars could be effectively localized and assessed.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental Assessment of Rebar Corrosion in Concrete Slab Using Ground Penetrating Radar (GPR)

Zaki

Johari

Hussin

et al. 2018

International Journal of Corrosion

View full text Add to dashboard Cite

show abstract

“…The patching repair method is recommended as an appropriate method for the RC members which are in the corrosion acceleration period as well as the deterioration stage (JSCE 2001). There have been some researches on the performance of RC in both structural as well as durability aspects (Shash 2005;Nounu et al 1999). It is generally accepted that the response of the repair system to the changes exerted by the repair must be understood for design and construction of durable concrete repair (Emmons and Vaysburd 1995).…”

Section: Introductionmentioning

confidence: 99%

Flexural Behavior of Corroded RC Members with Patch Repair - Experiments & Simulation

Sahamitmongkol

Suwathanangkul

Phoothong

et al. 2008

ACT

View full text Add to dashboard Cite

Structural performance of RC repaired by patching method was experimentally investigated and compared with noncorroded as well as corroded RC. Two repair materials; namely, polymer-modified mortar and epoxy-based repair material was applied for the repair work. The mechanical properties as well as the bonding characteristics of these two repair materials are different. It was found that the polymer-modified mortar can partially restore the structural performance while the more ductile epoxy-based repair material strengthen corroded RC structure so that its ultimate load carrying capacity is beyond that of non-corroded RC. The numerical analysis was conducted to reproduce the structural performance of repair RC observed by incorporating experimentally measured properties of repair materials. The bonding characteristic between repair materials and base concrete is represented by basic Coulomb friction model. The proposed concept of analysis shows satisfactorily accurate results which match well with experimental findings.

show abstract

“…Observándose que en el caso de vigas sometidas a condiciones agresivas en ambientes con cloruros, con el paso del tiempo, los morteros de cemento muestran una excesiva fisuración y son capaces de restaurar sólo el 50% de la capacidad de carga. De ahí que se busquen alternativas que le confieran mejores características, como el micro hormigón, que presenta más resistencia al ingreso de cloruros y no se fisura apenas (Nounu y Chaudhary 1999), morteros modificados con polímeros o morteros a los que se añaden diferentes materiales como fibras de refuerzo, fibras híbridas, vidrio reciclado, fosfato de magnesio o geopolímeros, y que les confieren características determinadas en función del material añadido (Al-Zahrani et al 2003;Calmon et al 2014 En cuanto a los morteros con polímeros, sus propiedades están influenciadas por la hidratación del cemento, la asociación entre las fases orgánicas e inorgánicas y la distribución del polímero en el mortero . Estudios realizados han demostrado que tienden a ser más dúctiles que los morteros de cemento, que su menor módulo de elasticidad da lugar a un menor riesgo de aparición de fisuras por retracción evitando así la formación de grietas en la interfase hormigón-mortero de reparación y que aumentan su durabilidad (Cabrera y Al-Hasan 1997;Hassan, Brooks y Al-Alawi 2001;Lee, Wang y Chiu 2007;Mechtcherine 2013;Mangat y Limbachiya 1997;Medeiros et al 2009;Pascal, Alliche y Pilvin 2004;Phoo-Ngernkham et al 2015;Robery y Shaw 1997;Shash 2005).…”

Section: Antecedentesunclassified

“…El coste de intervención en un elemento estructural, para alcanzar un cierto nivel de seguridad y durabilidad, va creciendo progresivamente cuanto más tarde se haga dicha intervención. Sólo en el Reino Unido se gastan aproximadamente 573 millones de euros anualmente en reparaciones de éstas estructuras (Comett 1995;Nounu y Chaudhary 1999).…”

Section: Patología Del Hormigón Armadounclassified

See 1 more Smart Citation

Estudio del comportamiento mecánico de elementos de hormigón reparados con morteros de reparación

Casal¹

View full text Add to dashboard Cite

Deterioration of reinforced concrete structures prior to the lifetime for which they have been projected is a common problem in construction. The origin of this deterioration is due to different factors, ranging from the aggressiveness of the environment to the conditions of use and maintenance, making it necessary to know the damage origin in order to determine the more appropriate repair materials, repair methods, as well as to ensure the durability of those repairs. The 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. In addition, four concrete reinforced beams, which had previously been tested to bending until fracture, were repaired and tested to bending with different amounts and types of steel. 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.

show abstract

Reinforced concrete repairs in beams

Cited by 21 publications

References 5 publications

Experimental Assessment of Rebar Corrosion in Concrete Slab Using Ground Penetrating Radar (GPR)

Experimental Assessment of Rebar Corrosion in Concrete Slab Using Ground Penetrating Radar (GPR)

Flexural Behavior of Corroded RC Members with Patch Repair - Experiments & Simulation

Estudio del comportamiento mecánico de elementos de hormigón reparados con morteros de reparación

Contact Info

Product

Resources

About