The inhibition behavior of a water-soluble silane for reinforcing steel in 3.5% NaCl saturated Ca(OH)2 solution

Liu, Jiaping; Cai, Jingshun; Shi, Liang; Liu, Jianzhong; Zhou, Xiaocheng; Mu, Song; Hong, Jinxiang

doi:10.1016/j.conbuildmat.2018.08.151

Cited by 24 publications

(8 citation statements)

References 29 publications

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“…The hydrophobic substances generated by the hydrolysis of TIA under alkaline conditions were all around the nanopores. Therefore, to adapt to the actual situation, the TIA polymers are distributed on both sides of the pores in this model [18,21]. In this part, Sections 3.1 and 3.2 describe the percolation kinetics of erosion solutions in C-S-H gel channels and the adsorption behavior of TIA by molecular dynamics.…”

Section: Resultsmentioning

confidence: 99%

“…Based on this understanding, adding hydrophobic materials or treating with corrosive ion complexes is an acceptable method to resist the intrusion of water or corrosive ions and thereby improve the durability of concrete [15][16][17][18][19][20]. At present, Liu has introduced a new nanomaterial for the cement hydration response, which can form insoluble nano-calcium carboxylate particles in parallel with the cement hydration process to regulate the gel channels of concrete [21].…”

Section: Introductionmentioning

confidence: 99%

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Mechanisms and Critical Technologies of Transport Inhibitor Agent (TIA) throughout C-S-H Nano-Channels

Luo

Huang

2022

Materials

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The critical issue of the durability of marine concrete lies in the continuous penetration and rapid enrichment of corrosive ions. Here a new ion transfer inhibitor, as TIA, with calcium silicate hydrate (C-S-H) interfacial affinity and hydrophobicity is proposed through insights from molecular dynamics into the percolation behavior of the ion solution in C-S-H nano-channels and combined with molecular design concepts. One side of the TIA can be adsorbed on the surface of the cement matrix and can form clusters of corrosive ions to block the gel pores so as to resist the ion solution percolation process. Its other side is structured as a hydrophobic carbon chain, similar to a door hinge, which can stick to the matrix surface smoothly before the erosion solution is percolated. It can then change into a perpendicular chain shape to reduce the percolation channel’s diameter and thereby inhibit the percolation when ions meet the inhibitor. Therefore, once the erosion solution contacts TIA, it can quickly chelate with calcium ions and erosion ions at the interface to form clusters and compact pores. In addition, the water absorption, chloride migration coefficient, and chloride content of concrete samples decreased significantly after adding TIA, proving that TIA can effectively enhance the durability of cement-based materials. The structure–activity relationship of ion transfer that is proposed can provide new ideas for solving the critical problems of durability of cement-based materials and polymer molecular design.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanisms and Critical Technologies of Transport Inhibitor Agent (TIA) throughout C-S-H Nano-Channels

Luo

Huang

2022

Materials

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“…Carbon steel (Q235 steel bar, Ø10 mm, and L 90 mm) with the composition of C 0.181%, Mn 0.580%, Si 0.350%, S 0.023%, P 0.012%, and Fe 97.5% was used in this study. Detailed preparation of steel surface is described elsewhere [14]. The steel were ground with SiC paper from 100 # , 400 # , 1000 # , and 1200 # , then further polished with Al 2 O 3 polishing powder, finally rinsed with acetone (Aladdin, Shanghai, China).…”

Section: Methodsmentioning

confidence: 99%

Layered Double Hydroxides Precursor as Chloride Inhibitor: Synthesis, Characterization, Assessment of Chloride Adsorption Performance

et al. 2018

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In this study, the chloride adsorption behaviors of CaAl-Cl LDH precursors with various Ca:Al ratios were investigated. The optimal chloride ion removal rate was 87.06% due to the formation of hydrocalumite. The chloride adsorption products of CaAl-Cl LDH precursors were further characterized by X-ray diffraction analysis and atomic structure analysis, the adsorption mechanism was considered to be co-precipitate process. The chloride adsorption behaviors of cementitious materials blended with CaAl-Cl LDH precursors were further investigated. Leaching test according to Test Code for Hydraulic Concrete (SL352-2006) was performed to testify the stability of chloride ions in the mortar. The results show that more than 98.3% chloride ions were immobilized in cement mortar blended with CaAl-Cl LDH precursor and cannot be easily released again. The inhibition performance of steel in the electrolytes with/without CaAl LDH precursor was investigated by using electrochemical measurements. The results indicate that CaAl LDH precursor can effectively protect the passive film on steel surface by chloride adsorption. Considering the high anion exchange capacities of the LDHs, synthesized chloride adsorbent precursor can be applied as new inhibitors blended in cementitious materials to prevent the chloride-induced deterioration. Moreover, the application of chloride adsorption on CaAl-Cl LDH could also be of interest for the application of seawater blended concrete.

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“…Recently, the effect of silane-based impregnating agent treatments on concrete surfaces has been evaluated by testing water absorption [13][14][15], chloride ion diffusion [16][17][18], carbonation depth [19,20], of the concrete used in this study is shown in Table 1. Natural sand with a 2 mm maximum size and gravel with a 25 mm maximum size were used as fine and coarse aggregates, respectively.…”

Section: Introductionmentioning

confidence: 99%

Effect of SiO2 Sol/Silane Emulsion in Reducing Water and Chloride Ion Penetration in Concrete

Geng

Hou

et al. 2020

Coatings

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Here, a new concrete hydrophobic treatment method is developed using SiO2 sol and silane emulsion. The effectiveness of the modification for concrete protection is evaluated through testing water absorption and chloride diffusion. Two types of concrete with different strength grades (C40, C50) are used as the research object. The results show that the water capillary absorption coefficient and chloride ion diffusion coefficient of concrete decrease greatly under the protection of SiO2 sol and silane emulsion. Additionally, the protection effect is better with the increase of SiO2 consumption. Contact angle test results reveal that when the coating amount of SiO2 sol and silane emulsion is 300 g/m2, respectively, the contact angle reaches 150.2°, indicating the concrete (C40) surface reaches the superhydrophobic state. Through scanning electron microscope (SEM) observation, it is found that the hydrophobic effect of the SiO2 sol/silane emulsion is mainly due to the change in the surface morphology of concrete (C40).

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The inhibition behavior of a water-soluble silane for reinforcing steel in 3.5% NaCl saturated Ca(OH)2 solution

Cited by 24 publications

References 29 publications

Mechanisms and Critical Technologies of Transport Inhibitor Agent (TIA) throughout C-S-H Nano-Channels

Mechanisms and Critical Technologies of Transport Inhibitor Agent (TIA) throughout C-S-H Nano-Channels

Layered Double Hydroxides Precursor as Chloride Inhibitor: Synthesis, Characterization, Assessment of Chloride Adsorption Performance

Effect of SiO2 Sol/Silane Emulsion in Reducing Water and Chloride Ion Penetration in Concrete

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