Adsorption of organic core-shell corrosion inhibitors on cement particles and their influence on early age properties of fresh cement paste

Zhu, Yangyang; Ma, Yuwei; Hu, Jie; Zhang, Zhangming; Huang, Jinzhen; Wang, Yangyang; Wang, Hao; Cai, Weixi; Huang, Haoliang; Yu, Qijun; Wei, Jiangxiong

doi:10.1016/j.cemconres.2020.106000

Cited by 8 publications

(4 citation statements)

References 52 publications

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“…Amphiphilic polyethylene oxide (PEO 113 )-b-polystyrene (PS 1171 ) copolymer was used to prepare microcapsule-based corrosion inhibitor (MCI) by dialysis in this study; the details related to the preparation procedure, copolymers and MCI can be found in [ 19 , 20 ]. The concentration of benzotriazole (BTA) encapsulated in MCI was 2.10 mg/mg and the concentration of MCI solution was 0.5 g/L the average diameter of MCI was about 250 nm [ 19 , 20 ].…”

Section: Methodsmentioning

confidence: 99%

“…In our previous studies [ 19 , 20 ], tailored microcapsule-based corrosion inhibitors (MCI) with no significantly harmful impact on cement-based materials was successfully prepared. Very high pH sensitivity was relevant for the prepared MCI: on one hand, the prepared MCI presented a high stability in SPS with pH of 13; on the other hand, 5 times higher amount of the released benzotriazole (BTA) was observed in SPS with pH lower than 11.…”

Section: Introductionmentioning

confidence: 99%

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pH-Triggered Release Performance of Microcapsule-Based Inhibitor and Its Inhibition Effect on the Reinforcement Embedded in Mortar

Huang

Zhu

et al. 2021

Materials

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The smart release of healing agents is a key factor determining the inhibition efficiency of microcapsules-based corrosion inhibitors for reinforced concrete. In this study, the release behavior of benzotriazole (BTA) in microcapsule-based inhibitors was investigated in mortar sample to clarify the influence of different hydration products on the release process. The results indicated that under high pH environment (pH > 12.4), only about 5% reserved BTA was released from the mortar sample. pH drop resulted in the increased release of BTA from mortar sample. Most BTA in the microcapsule-based inhibitors was released from mortar sample in low pH environment, which was closely related to morphology/composition alterations of hydration products caused by pH drop of the environment. The smart release of BTA dramatically delayed corrosion initiation of reinforced mortar and halted corrosion product accumulation on the steel surface. Therefore, the corrosion resistance of the reinforced mortar was improved after corrosion initiation.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

pH-Triggered Release Performance of Microcapsule-Based Inhibitor and Its Inhibition Effect on the Reinforcement Embedded in Mortar

Huang

Zhu

et al. 2021

Materials

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“…[1][2][3][4][5][6][7][8][9] The development of new organic corrosion inhibitors is based on compounds containing nitrogen, oxygen, and sulfur atoms. [10][11][12] The adsorption is favorable thanks to specific functional groups that can act on two fronts: at first they can promote the adsorption process on concrete surface through the negative charge localization on the oxygen atoms and on carboxylic groups or negatively charged DOI: 10.1002/masy.202000231 substituents, and moreover, they are also able to develop a repulsive action towards chloride ions. Thanks to the repulsive interactions this kind of inhibitors can avoid chlorides to be in contact with the carbon steel passive layer.…”

Section: Introductionmentioning

confidence: 99%

Organic Inhibitors to Prevent Chloride‐Induced Corrosion in Concrete: Atomistic Simulations of Triethylenetetramine‐Based Inhibitor Film

Raffaini

Catauro

Bolzoni

et al. 2021

Macromolecular Symposia

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Inhibitors are largely used to prevent chloride‐induced corrosion in reinforced concrete structures thanks to both a barrier effect on chloride penetration and a competition with the adsorption of the inhibitor. The interaction mechanisms between passive film on carbon steel, the inhibitor molecule, and chlorides still require deeper understanding. Theoretical studies based on molecular mechanics (MM) and molecular dynamics (MD) methods can be useful to better understand the passive film formation and its interaction with chlorides. In this work, the interaction between a triethylenetetramine (TETA) inhibitor film on γ‐FeOOH surface and chlorides is studied using MD methods. After MM optimization in the initial adsorption stage, some chlorides are close to protective TETA film. After MD run at room temperature effectively, chlorides remain close to the protective film. In order to have an effective barrier on chloride attack, the metal oxide must remain wholly covered by the protective film. The TETA film well covers the lepidocrocite surface but cannot kinetically efficiently prevent the chloride‐induced corrosion compared to other organic films exposing COO− groups because it does not exert any repulsion to chlorides.

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“…On the one hand, the exposure surface would be the passive layer due to the high pH concrete pore solution. On the other hand, the surrounding cement hydrated productions might also influence the exertion of the inhibition effect [10]. However, most of the related numerical studies merely considered the adsorption process between inhibitors and steel reinforcements.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Adsorption of Organic Inhibitors on C-S-H Gel

et al. 2020

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Corrosion inhibitors are one of the most effective anticorrosion techniques in reinforced concrete structures. Molecule dynamics (MD) was usually utilized to simulate the interaction between the inhibitor molecules and the surface of Fe to evaluate the inhibition effect, ignoring the influence of cement hydration products. In this paper, the adsorption characteristics of five types of common alkanol-amine inhibitors on C-S-H gel in the alkaline liquid environment were simulated via the MD and the grand canonical Monte Carlo (GCMC) methods. It is found that, in the MD system, the liquid phase environment had a certain impact on the adsorption configuration of compounds. According to the analysis of the energy, the binding ability of MEA on the surface of the C-S-H gel was the strongest. In the GCMC system, the adsorption of MEA was the largest at the same temperature. Furthermore, for the competitive adsorption in the GCMC system, the adsorption characteristics of the inhibitors on the C-S-H gel were to follow the order: MEA>DEA>TEA>NDE>DETA. Both MD and GCMC simulations confirmed that the C-S-H gel would adsorb the organic inhibitors to a different extent, which might have a considerable influence on the organic inhibitors to exert their inhibition effects.

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Adsorption of organic core-shell corrosion inhibitors on cement particles and their influence on early age properties of fresh cement paste

Cited by 8 publications

References 52 publications

pH-Triggered Release Performance of Microcapsule-Based Inhibitor and Its Inhibition Effect on the Reinforcement Embedded in Mortar

pH-Triggered Release Performance of Microcapsule-Based Inhibitor and Its Inhibition Effect on the Reinforcement Embedded in Mortar

Organic Inhibitors to Prevent Chloride‐Induced Corrosion in Concrete: Atomistic Simulations of Triethylenetetramine‐Based Inhibitor Film

Numerical Simulation of Adsorption of Organic Inhibitors on C-S-H Gel

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