Owing to the inherently multi-scale hydrophilicity of concrete, water and corrosive ions that may cause deterioration can easily adsorb to the surface through capillarity, and further penetrate into the interior of concrete. Superhydrophobic surface is one of the best choices for anti-corrosion, but it faces difficulties in durability and adaptability. This study reports a facile route to fabricate superhydrophobic concrete via in-situ biomineralization of inorganic crystals CaCO₃ at specific sites controlled by organic matrix. Under the bionic induction of dopamine, the multi-stage gradient structure has been fabricated on calcite crystal, in which a micro-nano composite structure has been formed on the concrete surface. The induction mechanism is explained by the density functional theory. The structure, composition and topological features of the prepared nano-coatings have been characterized by various surface analysis techniques. After modified by silane, the superhydrophobicity and hydrophobic stability of the surface has been confirmed by its large contact angle (CA = 156 ± 3°) and its stability under water, being attributed to the modified concrete voids, the surface micro/nanostructures and a silane layer on them.

由于混凝土固有的多尺度亲水性，可能导致变质的水和腐蚀性离子很容易通过毛细作用吸附到表面，并进一步渗入混凝土内部。超疏水表面是抗腐蚀的最佳选择之一，但它在耐久性和适应性方面面临困难。这项研究报告了通过无机晶体CaCO ₃原位生物矿化来制造超疏水混凝土的便捷途径在有机基质控制的特定位置。在多巴胺的仿生诱导下，在方解石晶体上制备了多级梯度结构，其中在混凝土表面形成了微纳米复合结构。感应机制由密度泛函理论解释。所制备的纳米涂层的结构，组成和拓扑特征已通过各种表面分析技术表征。经硅烷改性后，表面的超疏水性和疏水性稳定性已得到证实，它具有较大的接触角（CA = 156±3°）和在水中的稳定性，这归因于改性后的混凝土空隙，表面的微观/纳米结构和表面硅烷层在它们上面。