Corrosion inhibitors and other protective systems in concrete repair: concepts or misconcepts

Vaysburd, Alexander M.; Emmons, Peter

doi:10.1016/s0958-9465(03)00044-1

Cited by 65 publications

(27 citation statements)

References 2 publications

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“…However, the 0.0833% P. muellerianus admixture portrayed negative inhibition efficiency, η = -55.86±48.09% (experimental) or -14.93±39.26% (predicted) which indicated that the admixture rather aggravated, rather than inhibited, steel-reinforcement corrosion. This bear suggestion of the 0.0833% P. muellerianus admixture as representing inadequate quantity of admixture concentration which studies [41,43] posited as being potent with significantly intense corrosion attack rather corrosion inhibition in corrosive system. These constitute reasons the reported works in literature [41,43] identified needs for the use of suitable concentration, i.e.…”

Section: Inhibition Efficiency and Adsorption Isotherm Modelsmentioning

confidence: 89%

“…This bear suggestion of the 0.0833% P. muellerianus admixture as representing inadequate quantity of admixture concentration which studies [41,43] posited as being potent with significantly intense corrosion attack rather corrosion inhibition in corrosive system. These constitute reasons the reported works in literature [41,43] identified needs for the use of suitable concentration, i.e. sufficient quantity, of inhibitor for attaining effective corrosion inhibition and avoiding corrosion aggravation of steel-rebar in the requisite corrosive system.…”

Section: Inhibition Efficiency and Adsorption Isotherm Modelsmentioning

confidence: 89%

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Electrochemical Performance of Phyllanthus Muellerianus on the Corrosion of Concrete Steel-reinforcement in Industrial/Microbial Simulating-environment

Okeniyi¹,

Loto²,

Popoola³

2014

Port. Electrochim. Acta

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Electrochemical monitoring techniques were employed in this study to assess anticorrosion performance of Phyllanthus muellerianus leaf-extract on concrete steelreinforcement in 0.5 M H 2 SO 4 , used for simulating industrial/microbial environment. For this, steel-reinforced concretes admixed with different concentrations of the natural plant leaf-extract were partially immersed in the acidic test-solution and subjected to electrochemical monitoring of corrosion potential, corrosion current and corrosion rate. Test responses analysed as per ASTM G16-95 R04, showed that the corrosion rate correlated, r = 84.93%, ANOVA p-value = 0.0403, with the leaf-extract concentration admixed in concrete and the ratio of the standard deviation of potential to the standard deviation of current. These identified the 0.3333% Phyllanthus muellerianus (per weight of cement) with optimum effectiveness at inhibiting steel-reinforcement corrosion both by the experimental model, η = 91.66±2.51%, and by the prediction from the correlation fitting model, η = 85.54±14.44%. Fittings of both the experimental and the predicted data followed the Flory-Huggins and the Frumkin adsorption isotherms which suggest prevalent mechanism of physical adsorption (physisorption) of the extract on steel-rebar surface. These support the use of Phyllanthus muellerianus as environmentally-friendly admixture for inhibiting concrete steel-reinforcement corrosion in the industrial/microbial service-environment.

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Section: Inhibition Efficiency and Adsorption Isotherm Modelsmentioning

confidence: 89%

Section: Inhibition Efficiency and Adsorption Isotherm Modelsmentioning

confidence: 89%

Electrochemical Performance of Phyllanthus Muellerianus on the Corrosion of Concrete Steel-reinforcement in Industrial/Microbial Simulating-environment

Okeniyi¹,

Loto²,

Popoola³

2014

Port. Electrochim. Acta

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“…The presence of fine particles in the mixtures requires an extra dosage of water Lime mud from cellulose industry as raw material in cement mortars • 5 or superplasticizer additive to keep the workability invariable. However, the mentioned factors influence significantly the rheological behaviour (37,38) and the eventual impact due to fine particle is hard to be quantified. Is important remind here that the purpose of this experimental research is evaluate the real influence of LM, keeping them invariable.…”

Section: Fresh State Propertiesmentioning

confidence: 99%

“…Chlorides exert some influence on the kinetics of hydration, becoming higher in cement with extra dosage of LM. However, according to the EN 998-1:2003 standard, the global content of Cl − ions should not exceed 0.1 wt.% of mortar/ concrete constitution, since the efflorescence formation is often observed, compromising the durability of the material (38)(39)(40). Besides, the reaction between Cl − ions and C 3 A (tricalcium aluminate) or C4AF (tetracalcium aluminoferrite) imply in the chloroaluminates formation (40), in which the expansion occurrence increase the porosity that diminishes the mechanical strength.…”

Section: Fresh State Propertiesmentioning

confidence: 99%

Lime mud from cellulose industry as raw material in cement mortars

Modolo¹,

Senff²,

Labrincha³

et al. 2014

Mater. construcc.

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ABSTRACT:This study reports the use of lime mud (LM) in cement-based-mortars. Lime mud is a waste generated in the production of cellulose by the kraft mill process. It is mainly composed of CaCO 3 , a small amount of magnesium carbonate and other trace minerals. Mortars were prepared by adding different amounts of LM (10, 20 and 30% by weight of cement) in dry weight. The mortar compositions were evaluated through rheology and flow table measurements, assuring that all the samples exhibited adequate conditions for testing in both equipments. The hardened state properties were also evaluated through mechanical strengths at 7, 28 and 90 days of curing. Following a waste management solution perspective, this work intend to provide a general evaluation of LM application in cement based mortars, looking at both fresh and hardened properties in order to guarantee that the final application requirements are not hindered. RESUMEN: Lodo de carbonato de la industria de celulosa como materia prima en las morteros de cemento.Este estudio revela el uso de lodo de carbonato (LM) en morteros de cemento. El LM es un residuo compuesto principalmente por CaCO 3 generado en la producción de pasta de papel por el método Kraft. Los morteros se prepararon a partir de la adición de diferentes niveles de LM (10, 20 y 30% en peso de cemento) en peso seco. Las composiciones de los morteros fueron caracterizadas através de mediciones de reología de mesa y de flujo, asegurando que las muestras exhibían condiciones adecuadas para su caracterización en ambos equipamientos. Las propiedades en estado endurecido también se evaluaron através de resistencias mecánicas a los 7, 28 y 90 días de cura. Con objeto de gestión de residuos, este trabajo tiene la intención de proporcionar una visión general de la aplicación de LM en los morteros, haciendo hincapié en las propiedades con el fin de garantizar que los requisitos para su aplicación final no se vean obstaculizados.

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“…It was therefore, concluded that the risk of corrosion in the substrate would increase with time (Cusson et al 2004). The efficacy of using corrosion inhibitors was challenged by Vaysburd and Emmons (2004) for two reasons:…”

Section: Concrete Patching Materialsmentioning

confidence: 99%

Corrosion of concrete reinforcement and electrochemical factors in concrete patch repair

Zhang¹,

Mailvaganam²

2006

Can. J. Civ. Eng.

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1139/L05-088Canadian Journal of Civil Engineering, 33, 6, pp. 785-793, 2006-06-01 Corrosion characteristics and key electrochemical factors in patch repair Zhang, J. Y.; Mailvaganam, N. P. Abstract: Corrosion of concrete reinforcement at a patch repair is a complex problem and the current knowledge of its mechanism is quite limited. This review has examined the correlation between two corrosion mechanisms, macrocell and microcell corrosion, from fundamental electrochemical principles. It was found that both mechanisms could play significant roles in inducing corrosion damage, contrary to the prevailing opinion that macrocell corrosion is the main deterioration mechanism in patch repair. This has practical implications that need to be considered for an effective and durable repair. A review of the studies done to date also enabled the identification of the key factors in patch repair controlling the corrosion characteristics.Corrosion could occur at different locations ⎯in the vicinity of the patch: substrate, interface, or patch area⎯ depending on the respective electrochemical environments induced by the repair material properties and treatments, as well as the in-service exposure and mechanical loading.The review indicates that much of the needed research should focus on identification of corrosion mechanisms in order to effect successful patch repair in reinforced concrete structures.

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Corrosion inhibitors and other protective systems in concrete repair: concepts or misconcepts

Cited by 65 publications

References 2 publications

Electrochemical Performance of Phyllanthus Muellerianus on the Corrosion of Concrete Steel-reinforcement in Industrial/Microbial Simulating-environment

Electrochemical Performance of Phyllanthus Muellerianus on the Corrosion of Concrete Steel-reinforcement in Industrial/Microbial Simulating-environment

Lime mud from cellulose industry as raw material in cement mortars

Corrosion of concrete reinforcement and electrochemical factors in concrete patch repair

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