Performance evaluation of organic coatings against corrosion in reinforced cement mortars

Zafeiropoulou, Theodosia; Rakanta, E.; Batis, G.

doi:10.1016/j.porgcoat.2011.04.005

Cited by 64 publications

(33 citation statements)

References 10 publications

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“…This usage of 3.5% NaCl medium for the saline/marine environment followed practice in studies [40][41][42] as well as the identification from text of the 3.5% by weight as the typical content of salt in most seawater [19]. The remaining two samples for corrosion test in this study were the duplicate of Ctrl in Water samples that were also longitudinally immersed in plastic bowls but which contained distilled water.…”

Section: Methodsmentioning

confidence: 99%

Effects of Phyllanthus muellerianus Leaf-Extract on Steel-Reinforcement Corrosion in 3.5% NaCl-Immersed Concrete

Okeniyi

Loto

Popoola

2016

Metals

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This paper investigates Phyllanthus muellerianus leaf-extract effects on steel-reinforcement corrosion in concrete immersed in 3.5% NaCl, simulating saline/marine environment. Different concentrations of the leaf-extract were admixed in steel-reinforced concrete samples, which were immersed, with normal control, in the test-environment, while positive control samples were immersed in distilled water. Electrochemical measurements of corrosion-rate (by linear-polarizationresistance instrument), corrosion-current (by zero-resistance-ammeter) and corrosion-potential (by high impedance multimeter) were obtained for assessing the reinforcing-steel corrosion. Analyzed results showed that the corrosion-rate exhibited excellent correlation (R = 98.82%, Nash-Sutcliffe Efficiency = 97.66%, ANOVA p-value = 0.0006) with function of the admixture concentration and of the corrosion noise-resistance (ratio of corrosion-potential and corrosion-current standard deviations). The 0.3333% Phyllanthus muellerianus (per weight of cement) exhibited optimal efficiency, η = 97.58% ± 1.28% (experimental) or 95.33% ± 4.25% (predicted), at inhibiting concrete steel-reinforcement corrosion in the test-environment, which compares well with the positive control performance model, η = 97.96% ± 0.03%. The experimental and predicted models followed the Langmuir adsorption isotherm, which indicated physisorption as the Phyllanthus muellerianus leaf-extract adsorption mechanism on the reinforcing-steel. These support suitability of the N-, S-, and O-containing and π-electron rich Phyllanthus muellerianus leaf-extract as an environmentally-friendly inhibitor for effective corrosion-protection of steel-reinforcement in concrete designed for the saline/marine environment.

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Section: Methodsmentioning

confidence: 99%

Effects of Phyllanthus muellerianus Leaf-Extract on Steel-Reinforcement Corrosion in 3.5% NaCl-Immersed Concrete

Okeniyi

Loto

Popoola

2016

Metals

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“…The test results of both initial and weathered samples showed that the coating was completely impermeable to carbon dioxide under the test conditions and fulfilled the requirements concerning S d for CO 2 [4,5].…”

Section: Carbon Dioxide Permeabilitymentioning

confidence: 71%

“…Table 1 shows water vapour permeability of the coating foils. The study showed that the acrylic coating before weathering had the mean S d for H 2 O value 0.65, thus the material fulfilled the requirements [4,5]. A slight increase in S d value was noted after 126 cycles of weathering, but the samples still fulfilled appropriate requirements.…”

Section: Water Vapour Permeabilitymentioning

confidence: 99%

“…The barrier properties are often expressed in a diffusion equivalent air layer thickness S d [m]. In the case of S d for CO 2 , the value should be more than 50 meters, whereas S d for H 2 O ought to be less than 2 meters [4,5]. Another very beneficial feature of acrylic coatings is their high weathering resistance, thus they are often chosen as protective materials on concrete structures.…”

Section: Introductionmentioning

confidence: 99%

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Application of acrylic-based coatings for concrete protection

Kozak

2018

MATEC Web Conf.

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Abstract. The paper presents a description of acrylic-based polymers used in civil engineering for concrete protection. Some information on chemistry and properties of the acrylic coatings is included together with current trends in coating technology. Moreover, the paper shows test results, that is barrier properties and SEM observations of a commercial elastic acrylic-based polymer subject to artificial weathering for 1000h. The studies showed that the weathering did not change carbon dioxide permeability of the tested coating and its influence on water vapour permeability of the material was also very small. The test results show that an assessment of coating performance based only on barrier properties is not enough.

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“…Two approaches are generally used to evaluate the efficiency of inhibitors for concrete application; one uses simulated pore solution testing [8], and the other uses actual concrete or mortar specimens [9][10][11]. Both methods are sometimes used in conjunction [12].…”

Section: Introductionmentioning

confidence: 99%

Protection of reinforcement steel corrosion by phenyl phosphonic acid pre-treatment PART I: Tests in solutions simulating the electrolyte in the pores of fresh concrete

Etteyeb

Dhouibi

Takenouti

et al. 2015

Cement and Concrete Composites

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The carbon steel electrodes were first treated by immersion in 0.1 M phenyl phosphonic acid (C 6 H 5 P(O)(OH) 2, PPA) solution during 24 or 72 hours, then they were transferred into the corrosion test solution representing interstice pore electrolyte polluted by seawater:sat. Ca(OH) 2 + 0.5M NaCl) to evaluate the protective effectiveness of the pre-treatment. The investigation was performed essentially by polarization curves and electrochemical impedance measurements with rotating disc electrode. Very high protective effect was observed with steel pre-treated during 72 hours with stationary electrode. From polarization and electrochemical impedance spectroscopy experiments, the protective efficiency was found to be in the 90-99% range for 72 hour pre-treatment. This protective property remains effective even one month immersion. EDS analysis showed the presence of the phosphorus on the steel surface, probably due to the presence of iron-PPA complex.

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Performance evaluation of organic coatings against corrosion in reinforced cement mortars

Cited by 64 publications

References 10 publications

Effects of Phyllanthus muellerianus Leaf-Extract on Steel-Reinforcement Corrosion in 3.5% NaCl-Immersed Concrete

Effects of Phyllanthus muellerianus Leaf-Extract on Steel-Reinforcement Corrosion in 3.5% NaCl-Immersed Concrete

Application of acrylic-based coatings for concrete protection

Protection of reinforcement steel corrosion by phenyl phosphonic acid pre-treatment PART I: Tests in solutions simulating the electrolyte in the pores of fresh concrete

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