Effectiveness of corrosion inhibiting admixture combinations in structural concrete

Civjan, Scott A.; LaFave, James M.; Trybulski, Joanna; Lovett, Daniel; Lima, José Pinto de; Pfeifer, Donald W.

doi:10.1016/j.cemconcomp.2004.07.007

Cited by 23 publications

(6 citation statements)

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“…This has generally been agreed to be about 0.6, although some authors have observed different values [1,7]. In an aerated chloride solution, at the critical Cl − /OH − threshold, the chlorides cause dissolution of the protective layer of the oxides of iron and thus dissolution of the metal in the pit [1,6,8]. This creates charge difference, as a result of excess positive metal ions, forcing Cl − ions to rapidly migrate into the pit giving rise to metal chloride.…”

Section: Introductionmentioning

confidence: 94%

“…The protective layer is a film of the gamma ferric oxides ( -Fe 2 O 3 ), iron oxide hydroxide [FeO(OH)] and magnetite (Fe 3 O 4 ) which prevent Fe 2+ from entering into the solution as well as oxygen from diffusing to the steel surface [4]. The layer has also been found to be rich in lime with inclusions of C-S-H gel [5,6]. The high electric resistivity of concrete is also another aspect that helps in corrosion resistance of the rebar.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Chlorides on Corrosion of Simulated Reinforced Blended Cement Mortars

Wachira

2019

International Journal of Corrosion

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Cementitious materials are subject to degradation when subjected to corrosive chloride media. This paper reports the experimental results on corrosion studies conducted on a potential cementitious material, PCDC, made from a blend of 55 % Ordinary Portland Cement (OPC), Dried Calcium Carbide Residue (DCCR), and an incineration mix of Rice Husks (RH), Spent Beaching Earth (SBE), and Ground Reject Bricks (BB). The experiments were run along 100 % OPC. Different w/c were used. Corrosion current densities using linear polarisation resistance (LPR) and corrosion potentials measurements versus saturated calomel electrode were used for the determination of corrosion rates and potentials, respectively, for simulated reinforcement at different depths of cover in the cement mortars. The results showed that PCDC exhibited higher corrosion current densities over all depths of covers and early attainment of active corrosion than the control cements. In conclusion, PCDC and OPC can be used in a similar corrosive media during construction.

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Effects of Chlorides on Corrosion of Simulated Reinforced Blended Cement Mortars

Wachira

2019

International Journal of Corrosion

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“…However, most modern synthetic inhibitors tend to contaminate the environment, necessitating the development and exploration of highly potent and environmentally acceptable alternatives [26]. In the last five decades, various attempts have been made to improve the protective nature of concrete pore ions by adding admixtures that inhibit corrosion at different stages of the concrete-making process [27,28]. Chemical admixtures for concrete must meet specific requirements to efficiently eliminate several substances commonly used for corrosion protection of steel, without adversely affecting durability, concrete hydration, development of mechanical properties, or other material characteristics.…”

Section: Introductionmentioning

confidence: 99%

Corrosion inhibitors for enhanced strength, durability, and microstructure of coastal concrete structures

Sasidharan

Parida

Singh

et al. 2023

Mater. Res. Express

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The prevalence of catastrophic structural member failure caused by steel corrosion in civil infrastructure underscores the importance of reducing reinforcement corrosion to enhance overall infrastructure costs, reliability, and sustainable development. This study examines the use of corrosion inhibitors to improve the durability and strength of concrete structures, with a focus on their long-term effectiveness in resisting corrosion in reinforced concrete structures. Multiple approaches such as inhibitors, repairing processes, and coatings have been explored to prevent concrete corrosion damage, with an emphasis on concrete corrosion performance in coastal and corrosive situations. This study investigates the effect of six different corrosion inhibitors (zinc oxide, magnesium oxide, urea, sodium nitrate, sodium molybdate, and diethyl ether) on the compressive strength, durability, and microstructural properties of concrete samples. The compressive strength is assessed using both destructive (28 days cube compressive strength) and non-destructive (Ultrasonic Pulse Velocity) test methods, while concrete durability is evaluated using the rapid chloride permeability test . SEM imaging is also conducted to analyze the microstructure of each mix. The findings of this study highlight the importance of inhibitors in enhancing the durability of reinforced concrete structures.

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“…Corrosion of RC is a problem throughout the world, demanding significant amounts for repair and rehabilitation. Extensive research has been done to establish relationships between the chloride ions content and the onset of corrosion [4][5][6][7][8]. Haque and Kayyali [9] showed that not all chloride ions that ingress into concrete remain free in the pore solution.…”

Section: Introductionmentioning

confidence: 99%

Effect of Sulphate and Chloride Ingress on Selected Cements Mortar Prisms Immersed in Seawater and Leather Industry Effluent

Wachira

Ngari

Thiong’o

et al. 2019

Advances in Civil Engineering

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Cement structures are major capital investments globally. However, exposure of cement-based materials to aggressive media such as chloride- and sulphate-laden environments such as coastal areas affects their performance. Ordinary Portland cement (OPC) is the main cement used in buildings and civil structures such as dams and bridges. This paper reports the findings of an experimental investigation on the effect of ingress of Cl− and SO42− on compressive strength development and the ions’ diffusivity in selected OPC brands in Kenya. The aggressive media used included seawater (SW) and wastewater from leather industry (WLI). Three brands of commonly used cements of OPC in Kenya were used. Mortar prisms were prepared from each brand of cement at different water-to-cement ratios (w/c) of 0.5, 0.6, 0.65, and 0.7 and allowed to cure for 28 days in a highly humid environment. The aggressive ions’ ingress in the mortar prisms was accelerated using a potential difference of 12 V ± 0.1 V. Analysis of diffusivity and diffusion coefficient of Cl− and SO42− was finally done. Compressive strength analysis was done before (at the 2nd, 7th, 14th, and 28th day) and after exposure to the aggressive ions. The results showed that the diffusivity of chlorides was more pronounced than that of sulphates. Diffusivity was observed to be higher at higher w/c ratios for all cement categories. It was observed that compressive strength increased with curing age, with the highest observed at 28 days. Cement A was generally found to have the highest compressive strength for all w/c ratios. The compressive strength was observed to increase after the mortar prisms were exposed to SW as opposed to the ones exposed to WLI. Generally, it was also observed that the strength gain increased with increase in w/c. The loss in strength was also observed to increase with increase in w/c.

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Effectiveness of corrosion inhibiting admixture combinations in structural concrete

Cited by 23 publications

References 1 publication

Effects of Chlorides on Corrosion of Simulated Reinforced Blended Cement Mortars

Effects of Chlorides on Corrosion of Simulated Reinforced Blended Cement Mortars

Corrosion inhibitors for enhanced strength, durability, and microstructure of coastal concrete structures

Effect of Sulphate and Chloride Ingress on Selected Cements Mortar Prisms Immersed in Seawater and Leather Industry Effluent

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