Facile fabrication of superhydrophobic coatings on concrete substrate

Hou, Pingping; Zhan, Zhao-Hui; Qi, Shuai; Ma, Yingjie; Li, Bo; Ran, Qianping

doi:10.1108/prt-01-2021-0010

Cited by 4 publications

(2 citation statements)

References 23 publications

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“…Clions diffusion in concrete is closely related to water migration; thus, it is essential to develop waterproofing coatings (Song et al, 2017;Yang et al, 2021;Chen et al, 2023aChen et al, , 2023bYin et al, 2022aYin et al, , 2022bYin et al, , 2022cYin et al, 2022aYin et al, , 2022bYin et al, , 2022cYin et al, 2023aYin et al, , 2023bYin et al, , 2023cYin et al, 2023aYin et al, , 2023bYin et al, , 2023cYin et al, 2020aYin et al, , 2020b. Recently, the application of superhydrophobic concrete surfaces (SCS) has attracted much attention due to their total water repellence (Husni et al, 2017;Li et al, 2019;Yin et al, 2020aYin et al, , 2020bHou et al, 2021;Cui et al, 2024;Cui et al, 2023). It is well known that the wettability of SCS benefits from micro-rough morphology and low surface energy (Song et al, 2019a(Song et al, , 2019b.…”

Section: Introductionmentioning

confidence: 99%

Anti-corrosive superhydrophobic coatings for reinforcement protection: recycling of concrete garbage

Wen,

Cao,

et al. 2024

ACMM

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Purpose The purpose of this paper was to prepare a ternary hierarchical rough particle to accelerate the anti-corrosive design for coastal concrete infrastructures. Design/methodology/approach A kind of micro-nano hydrophobic ternary microparticles was fabricated from SiO2/halloysite nanotubes (HNTs) and recycled concrete powders (RCPs), which was then mixed with sodium silicate and silane to form an inorganic slurry. The slurry was further sprayed on the concrete surface to construct a superhydrophobic coating (SHC). Transmission electron microscopy and energy-dispersive X-ray spectroscopy mappings demonstrate that the nano-sized SiO2 has been grafted on the sub-micron HNTs and then further adhered to the surface of micro-sized RCP, forming a kind of superhydrophobic particles (SiO2/HNTs@RCP) featured of abundant micro-nano hierarchical structures. Findings The SHC surface presents excellent superhydrophobicity with the water contact angle >156°. Electrochemical tests indicate that the corrosion rate of mild steel rebar in coated concrete reduces three-order magnitudes relative to the uncoated one in 3.5% NaCl solution. Water uptake and chloride ion (Cl-) diffusion tests show that the SHC exhibits high H2O and Cl- ions barrier properties thanks to the pore-sealing and water-repellence properties of SiO2/HNTs@RCP particles. Furthermore, the SHC possesses considerable mechanical durability and outstanding self-cleaning ability. Originality/value SHC inhibits water uptake, Cl- diffusion and rebar corrosion of concrete, which will promote the sustainable application of concrete waste in anti-corrosive concrete projects.

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Section: Introductionmentioning

confidence: 99%

Anti-corrosive superhydrophobic coatings for reinforcement protection: recycling of concrete garbage

Wen,

Cao,

et al. 2024

ACMM

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“…Phenomena in the natural world have inspired the discoveries of new materials (Ye et al , 2011; Cheng et al , 2017; Zhou et al , 2018). A typical example is the superhydrophobic surface of lotus leaves, on which water contact angles (WCA) are greater than 150° and sliding angles (SA) are smaller than 10° (Hou et al , 2021; Nun et al , 2002; Jiang et al , 2020; Kim et al , 2018). Researchers investigated the underlying physical and chemical properties and discovered that the lotus leaves is composed of micro- and nanoscale hierarchical structures combined with low-surface-energy materials (Li et al , 2014).…”

Section: Introductionmentioning

confidence: 99%

Facile preparation of robust superhydrophobic coating on concrete surface through “all-covalent” strategy

Hou

Huang

Wang

et al. 2022

PRT

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Purpose The purpose of this study is to prepare a robust superhydrophobic coating on concrete substrate with remarkable chemical and mechanical durability through “all-covalent” strategy. Design/methodology/approach Amino-modified silica nano/micro-particles were prepared through two synthetic steps. “All-covalent” strategy was introduced to prepare a robust superhydrophobic coating on concrete surface via a “all-in-one” dispersion and a simple spraying method. The successful construction of the products was confirmed by Fourier transform infrared spectroscopy, water contact angles (WCA), X-ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM). The concrete protective properties were verified by solution immersion test, pull-off test and rapid chloride migration coefficient test. The mechanical durability was tested by falling sand impact. Findings Hierarchical structures combined with the low-surface-energy segments lead to typically superhydrophobic coating with a WCA of 156° and a sliding angle of 1.3°. The superhydrophobic coating prepared through “all-covalent” strategy not only improves chemical and mechanical durability but also achieves higher corrosion and wear resistance than the comparison sample prepared by physically blending strategy. More importantly, the robust superhydrophobic coating showed excellent adhesion and protective performance of concrete engineerings. Practical implications This new “all-covalent” superhydrophobic coating could be applied as a concrete protective layer with properties of self-cleaning, anti-graffiti, etc. Originality/value Introduction of both silica nanoparticles and silica microparticles to prepare a robust superhydrophobic coating on concrete surface through “all-covalent” strategy has not been systematically studied previously.

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Superhydrophobic coatings prepared from fluorinated silica nanoparticles and fluororesin: wetability, chemical stability, mechanical durability and water repellency

Hou,

Qian,

et al. 2024

PRT

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Purpose The purpose of this study is to explore the interfacial adhesion between superhydrophobic coatings FC-X (X = 1%, 2%, 3%, 4% and 5%) and the concrete substrate, along with the impact of FC-X on the water repellency characteristics of the concrete substrate. Design/methodology/approach One synthetic step was adopted to prepare novel F-SiO2 NP hybrid fluororesin coating. The impact of varying mass fractions of F-SiO2 NPs on the superhydrophobicity of FC-X was analyzed and subsequently confirmed through water contact angle (WCA) measurements. Superhydrophobic coatings were simply applied to the concrete substrate using a one-step spraying method. The interfacial adhesion between FC-X and the concrete substrate was analyzed using tape pasting tests and abrasion resistance measurements. The influence of FC-X on the water repellency of the concrete substrate was investigated through measurements of water absorption, impermeability and electric flux. Findings FC-4% exhibits excellent superhydrophobicity, with a WCA of 157.5° and a sliding angle of 2.3°. Compared to control sample, FC-X exhibits better properties, including chemical durability, wear resistance, adhesion strength, abrasion resistance, water resistance and impermeability. Practical implications This study offers a thorough investigation into the practical implications of enhancing the durability and water repellency of concrete substrates by using superhydrophobic coatings, particularly FC-4%, which demonstrates exceptional superhydrophobicity alongside remarkable chemical durability, wear resistance, adhesion strength, abrasion resistance, water resistance and impermeability. Originality/value Through the examination of the interfacial adhesion between FC-X and the concrete substrate, along with an assessment of FC-X’s impact on the water repellency of the concrete, this paper provides valuable insights into the practical application of superhydrophobic coatings in enhancing the durability and performance of concrete materials.

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Facile fabrication of superhydrophobic coatings on concrete substrate

Cited by 4 publications

References 23 publications

Anti-corrosive superhydrophobic coatings for reinforcement protection: recycling of concrete garbage

Anti-corrosive superhydrophobic coatings for reinforcement protection: recycling of concrete garbage

Facile preparation of robust superhydrophobic coating on concrete surface through “all-covalent” strategy

Superhydrophobic coatings prepared from fluorinated silica nanoparticles and fluororesin: wetability, chemical stability, mechanical durability and water repellency

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