Mechanically stable and superhydrophobic nano-SiO2@silane/silicate coating for enhanced impermeability of mortar

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-02-25 DOI:10.1016/j.conbuildmat.2025.140541

Wei Liu , Jiale Song , Hui Zhao , Zhaokuan Cui , Shuheng Zhang , Yu Qiao , Chenhong Cao , Weiguang Li

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引用次数: 0

Abstract

The superhydrophobic coating can effectively inhibit the intrusion and adhesion of water-corrosive media on the surface of concrete. However, the poor mechanical stability and expensive materials significantly restricts its application in concrete engineering. Thus, superhydrophobic nano-SiO₂@silane/silicate coating are successfully prepared by simply spraying nano-SiO₂@silane on the surface of mortar pretreated by silicate. The pretreated silicate can enable the surface of mortar to enhance flatness and compactness, offering an optimal substrate for spraying nano-SiO₂@silane hydrolysate. Further, the low surface energy of silane and the micro-nanostructure formed by nano-SiO₂ synergistically make the composite coating possess excellent superhydrophobic properties, with a contact angle of 154° and a slide angle of 5°. Notably, compared with original mortar, the water absorption rate, water vapor transmission rate, and chloride ion penetration depth are reduced by 86.4 %, 67.3 % and 87.9 %, respectively, exhibiting outstanding impermeability. In addition, the coated mortar possesses excellent self-cleaning properties and resistance to rain erosion. Meanwhile, the coated mortar also exhibits excellent resistance to mechanical wear (>200 cycles of abrasions) and resistance to UV radiation (>100 h). Such outstanding comprehensive performance can guarantee concrete to long-term apply in outdoors. This work provides a simple, feasible, economical, and effective research idea for developing superhydrophobic coatings on concrete.

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.