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Recent Advances in Hydrophobic and Icephobic Surface Treatments of Concrete
Coatings ( IF 3.4 ) Pub Date : 2020-05-05 , DOI: 10.3390/coatings10050449 Rosa Di Mundo , Claudia Labianca , Giuseppe Carbone , Michele Notarnicola
Coatings ( IF 3.4 ) Pub Date : 2020-05-05 , DOI: 10.3390/coatings10050449 Rosa Di Mundo , Claudia Labianca , Giuseppe Carbone , Michele Notarnicola
In this review, we present a survey on hydrophobic surface treatments of concrete, important protection tools against deterioration and corrosion phenomena. In the frame of a standardized distinction in coatings, pore blockage, and impregnation methods, we highlight the huge variety of compounds and formulations utilized, and the different performances reached in terms of water contact angle, water absorption, chloride penetration, and, rarely reported, anti-icing/icephobic action. Our view covers the spectrum of the surface treatments, but also makes a comparison with hydrophobic bulk modifications of concrete, procedures often utilized as well; further, novel proposals of more sustainable routes are presented. We note that coating and impregnation, preferably when based on polyurethane and silane/siloxane, respectively, appear more effective against water ingress. The achieved wetting character is hydrophobic or, at most, overhydrophobic. Superhydrophobic coatings for concrete have been obtained by embedding nano-powders in hydrophobic emulsions, allowing to add a nanotexture to the preexisting complex roughness of the material. Concrete treated with this type of coating has also recently shown a pronounced icephobic character, a parameter that goes beyond the freeze–thaw characterization usually conducted on cement-based materials.
中文翻译:
混凝土憎水和憎冰表面处理的最新进展
在这篇综述中,我们对混凝土的疏水性表面处理进行了调查,这是防止变质和腐蚀现象的重要保护工具。在涂层,孔堵塞和浸渍方法的标准化区分的框架内,我们重点介绍了所用化合物和配方的种类繁多,以及在水接触角,吸水率,氯离子渗透性方面达到的不同性能,并且鲜有报道,抗冰/疏血作用。我们的观点涵盖了表面处理的范围,但也与疏水性的混凝土散装改性(经常使用的程序)进行了比较;此外,提出了关于更可持续路线的新颖建议。我们注意到涂层和浸渍,最好分别基于聚氨酯和硅烷/硅氧烷,似乎更有效地防止进水。达到的润湿特性是疏水的,或至多是超疏水的。通过在疏水性乳液中嵌入纳米粉末,获得了用于混凝土的超疏水涂料,从而可以为材料预先存在的复杂粗糙度添加纳米纹理。最近,用这种类型的涂料处理过的混凝土也表现出明显的憎冰特性,这一参数超出了通常在水泥基材料上进行的冻融特性。
更新日期:2020-05-05
中文翻译:
混凝土憎水和憎冰表面处理的最新进展
在这篇综述中,我们对混凝土的疏水性表面处理进行了调查,这是防止变质和腐蚀现象的重要保护工具。在涂层,孔堵塞和浸渍方法的标准化区分的框架内,我们重点介绍了所用化合物和配方的种类繁多,以及在水接触角,吸水率,氯离子渗透性方面达到的不同性能,并且鲜有报道,抗冰/疏血作用。我们的观点涵盖了表面处理的范围,但也与疏水性的混凝土散装改性(经常使用的程序)进行了比较;此外,提出了关于更可持续路线的新颖建议。我们注意到涂层和浸渍,最好分别基于聚氨酯和硅烷/硅氧烷,似乎更有效地防止进水。达到的润湿特性是疏水的,或至多是超疏水的。通过在疏水性乳液中嵌入纳米粉末,获得了用于混凝土的超疏水涂料,从而可以为材料预先存在的复杂粗糙度添加纳米纹理。最近,用这种类型的涂料处理过的混凝土也表现出明显的憎冰特性,这一参数超出了通常在水泥基材料上进行的冻融特性。