Combined effect of carbonation and chloride ingress in concrete

Zhu, Xingji; Zi, Goangseup; Cao, Zhifeng; Cheng, Xudong

doi:10.1016/j.conbuildmat.2016.02.034

Cited by 118 publications

(49 citation statements)

References 47 publications

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“…By these, the corrosion noise resistance, R n , was also evaluated for each steel-reinforced concrete samples using ratios of Weibull model of standard deviations of corrosion potential to the standard deviations of corrosion current as per Equation (7). Figure 3, therefore, shows the results of the corrosion noise resistance for the steel-reinforced concrete samples, superimposed on the plots of corrosion rate, in increasing order of the corrosion rate effect on the embedded reinforcing-steel in the samples.…”

Section: Corrosion Rate and Corrosion Noise Resistance For Correlatiomentioning

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: Corrosion Rate and Corrosion Noise Resistance For Correlatiomentioning

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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“…Besides, cracks provide a convenient channel for water ingression, harmful ions and oxygen towards the internal concrete and the surface of rebar, which could result in accelerating corrosion of rebar. Therefore, it is necessary to investigate corrosion behavior of rebar under the effect of crack in chloride aggressive environment [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Effect of Crack on Durability of RC Material under the Chloride Aggressive Environment

et al. 2018

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Exposed to aggressive environments, the rebar in reinforced concrete (RC) bridges will be corroded gradually. Durability of RC material mostly depends on the rebar corrosion behavior. In this research, influences of crack on rebar corrosion were investigated. Firstly, RC specimens with different crack number, width and spacing were prepared and the rebar corrosion was conducted through an accelerated chloride penetration method. Then, corrosion current densities of rebar were calculated from electrochemical test methods including liner polarization (LP), Tafel potentiodynamic polarization (TPP) and electrochemical impedance spectroscopy (EIS) measurements. Finally, the discussion was presented about a more reasonable electrochemical testing method for rebar corrosion in RC material. Besides, the significant influence factor among crack width, number and spacing was evaluated based on both One-way analysis of variance (One-way ANOVA) and Turkey's honest significant difference (Turkey's HSD) test. The results revealed that a more reasonable way to obtain corrosion current densities of rebar is combining EIS measurement with TPP measurement. Crack number shows the most significant effect on corrosion behavior of rebar, while crack spacing possesses the least one.

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“…The first one is due to the physical barrier provided by the concrete cover on the reinforcement, whose efficiency depends on the quality and thickness of the concrete cover. The chemical protection results from the high pH in the aqueous solution of the concrete pores, allowing the formation of a thin protective film known as the passivating layer 8 .…”

Section: Introductionmentioning

confidence: 99%

Durability of Concrete After Fire Through Accelerated Carbonation Tests

et al. 2019

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Degradation of mechanical properties and durability of reinforced concrete structures occur when they are subjected to fire situations, depending on the characteristics of the material, fire duration and the ways of fire extinguishing. Mechanical properties such as compressive strength, tensile strength and elasticity modulus are some examples of typically altered characteristics in concrete during high temperature exposure. Nevertheless, little is known about the advance of the carbonation front on fire-damaged concrete, which is a characteristic directly related to the durability of the structural system. For this purpose, the carbonation front was evaluated in specimens with characteristic strengths of 20 MPa and 35 MPa, subjected to high temperatures (200 °C, 500 ºC and 700 ºC) and different types of cooling (fast and slow). It was observed that the concrete durability is harmed by exposure to high temperatures and fast cooling. However, advance of the carbonation front was not verified in slow cooling situations.

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Combined effect of carbonation and chloride ingress in concrete

Cited by 118 publications

References 47 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

Effect of Crack on Durability of RC Material under the Chloride Aggressive Environment

Durability of Concrete After Fire Through Accelerated Carbonation Tests

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