Influence of a Nano-Hydrophobic Admixture on Concrete Durability and Steel Corrosion

Cai, Jingshun; Ran, Qianping; Ma, Qi; Zhang, Hao; Li, Kai; Zhou, Yang; Mu, Song

doi:10.3390/ma15196842

Cited by 9 publications

(4 citation statements)

References 27 publications

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“…Cai et al [63] and Li et al [64] both explored the use of nano-hydrophobic materials in concrete for enhanced durability and corrosion resistance. Cai's study revealed a substantial reduction in water adsorption (>78%) and a doubling of the initial corrosion time for steel reinforcement.…”

Section: Nanomaterialsmentioning

confidence: 99%

“…This interaction highlights the potential for improved corrosion protection of reinforcement in concrete structures through the strategic use of silane-modified materials. Cai et al [63] studied the impact of a nanohydrophobic admixture (TIA) on the durability of concrete and corrosion of steel using electrochemical measurements. TIA delayed initial corrosion onset, extending it by over one cycle with 30 kg m −3 TIA.…”

Section: Impact On Reinforcement Corrosion Of Bmhcmentioning

confidence: 99%

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A comprehensive review of hydrophobic concrete: surface and bulk modifications for enhancing corrosion resistance

Gnanaraj S,

2024

Eng. Res. Express

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Corrosion in concrete structures constitutes significant challenges, threatening integrity and requiring high maintenance costs. Hydrophobic concrete presents an emerging solution for addressing corrosion in concrete structures, especially in marine environments. This review article investigates advanced techniques for surface and bulk modifications of hydrophobic concrete, focusing on their efficacy in enhancing corrosion resistance. Surface modifications using silane-siloxane coatings and polyurethane treatments significantly reduce water absorption by up to 30% and chloride ion permeability by up to 50%. Bulk modifications incorporating nano-silica and calcium stearate demonstrate marked improvements in mechanical properties and corrosion resistance, with calcium stearate reducing corrosion rates by 40%. These treatments also contribute to an average increase in compressive strength of 15% and a decrease in corrosion current densities, indicating practical utility in environments such as marine conditions. Additionally, innovative techniques like fluorosilane treatments and steel fibres further fortify impermeability and structural integrity, demonstrating the versatility of hydrophobic concrete in addressing corrosion challenges. Moreover, using eco-friendly ingredients underscores its potential for sustainable infrastructure development. In summary, hydrophobic concrete offers a comprehensive strategy for combating corrosion, providing surface and bulk modifications that enhance durability, reduce maintenance costs, and ensure the long-term sustainability of modern infrastructure.

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Section: Nanomaterialsmentioning

confidence: 99%

Section: Impact On Reinforcement Corrosion Of Bmhcmentioning

confidence: 99%

A comprehensive review of hydrophobic concrete: surface and bulk modifications for enhancing corrosion resistance

Gnanaraj S,

2024

Eng. Res. Express

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“…Alternatively, much attention has been paid to the introduction of inorganic nanomaterials or hydrophobic organic components with specific advantages. Although inorganic nanomaterials such as nano-SiO 2 [ 6 , 7 ], TiO 2 [ 8 ], Fe 3 O 4 [ 9 ], and carbon nanomaterials [ 10 ] can fill the connecting pores and reduce the harmful pores, the serious aggregation of nanomaterials in cement slurries and required high dosage amount may cause limited effects, increased shrinkage and poor workability [ 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of an Amphiphilic Micelle of Diblock Copolymer on Water Adsorption of Cement Paste

et al. 2023

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To reduce the inhibiting effects of polystyrene-based emulsion on the hydration process and strength development of cementitious materials, an amphiphilic diblock copolymer polystyrene-block-poly(acrylic acid) (PS-b-PAA) was synthesized via reversible addition-fragmentation chain transfer (RAFT) polymerization and demonstrated in cement paste system for improving the resistance to water absorption without significantly reducing 28-day compressive strength. Firstly, the dissolved PS-b-PAA was added into water, and it quickly self-assembled into amphiphilic 80 nm-sized micelles with hydrophobic polystyrene-based core and hydrophilic poly(acrylic acid)-based shell. The improved dispersion compared to that of polystyrene emulsion may minimize the inhibiting effects on strength development, as the effects of PS-b-PAA micelle as hydrophobic admixtures on rheological properties, compressive strength, water absorption, hydration process, and pore structure of 28-day cement pastes were subsequently investigated. In comparison with the control sample, the saturated water absorption amount of cement pastes with 0.4% PS-b-PAA was reduced by 20%, and the 28-day compressive strength was merely reduced by 2.5%. Besides, the significantly increased hydrophobicity instead of slightly decreased porosity of cement paste with PS-b-PAA may contribute more to the reduced water adsorption characteristics. The study based on prepared PS-b-PAA micelle suggested a promising alternative strategy for fabricating polystyrene-modified concrete with reduced water absorption and unaffected compressive strength.

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“…The next strategy involves using a coating to prevent water from contact with the concrete. Ionic varnishes, edge varnishes, and ground varnishes are mostly included [3]. The design of concrete products as well as the causes of hybrid cracking have been the focus of the bulk of nano-research in building projects.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Nano-Based Bio-Carbonates in Superhydrophobic Concrete—A Review

et al. 2023

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Concrete must be a hydrophilic compound that is easily fabricated by nature. At the nanoscale, mechanical and chemical reactions alter the quality of cement-based substances. Continuous sprinkling of nano-silica solution synthesised with minimal surface solvents has been used to create a superhydrophobic (SH) concrete surface while similarly modifying the surface’s chemical composition and dynamical intrinsic structure. In this study, we examine the impacts of admixtures in SH concrete including nano-based bio-carbonate. The fundamental characteristics and dispersal techniques of nanoparticles often employed in cement-based compounds are reviewed initially in this paper. Investigations of the large contact angle, small slide angle, and carbonated thickness have been employed to analyze the impacts of admixtures. Additionally, the industry and uses of nanoparticles for concrete substances are addressed, and the expense is inventively represented by a survey questionnaire. Finally, this article identifies the obstacles that now occur in the field of research and offers appropriate future viewpoints.

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Influence of a Nano-Hydrophobic Admixture on Concrete Durability and Steel Corrosion

Cited by 9 publications

References 27 publications

A comprehensive review of hydrophobic concrete: surface and bulk modifications for enhancing corrosion resistance

A comprehensive review of hydrophobic concrete: surface and bulk modifications for enhancing corrosion resistance

Effects of an Amphiphilic Micelle of Diblock Copolymer on Water Adsorption of Cement Paste

The Effects of Nano-Based Bio-Carbonates in Superhydrophobic Concrete—A Review

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