Coppola Luigi, Coffetti Denny, Crotti Elena, Gazzaniga Gabriele, Pastore Tommaso
Department of Engineering and Applied Sciences, University of Bergamo, 24044 Dalmine (BG), Italy.
UdR Materials and Corrosion, Consorzio INSTM, 50121 Florence, Italy.
Materials (Basel). 2020 Apr 24;13(8):2001. doi: 10.3390/ma13082001.
One of the most important parameters concerning durability is undoubtedly represented by cement matrix resistance to chloride diffusion in environments where reinforced concrete structures are exposed to the corrosion risk induced by marine environment or de-icing salts. This paper deals with protection from chloride ingress by a silane-based surface-applied corrosion inhibitor. Results indicated that the corrosion inhibitor (CI) allows to reduce the penetration of chloride significantly compared to untreated specimens, independently of w/c, cement type, and dosage. Reduction of chloride diffusion coefficient (D) measured by an accelerated test in treated concrete was in the range 30-60%. Natural chloride diffusion test values indicate a sharp decrease in apparent diffusion coefficient (D) equal to about 75% when concrete is protected by CI. Mechanism of action of CI in slowing down the chloride penetration inside the cement matrix is basically due to the water repellent effect as confirmed by data of concrete bulk electrical resistivity.
关于耐久性的最重要参数之一无疑是在钢筋混凝土结构面临海洋环境或除冰盐引发的腐蚀风险的环境中，水泥基体对氯离子扩散的抵抗能力。本文探讨了通过硅烷基表面应用缓蚀剂来防止氯离子侵入的方法。结果表明，与未处理的试件相比，缓蚀剂（CI）能够显著降低氯离子的渗透，且不受水灰比、水泥类型和用量的影响。通过加速试验测得的处理后混凝土中氯离子扩散系数（D）的降低幅度在30%至60%之间。自然氯离子扩散试验值表明，当混凝土用CI保护时，表观扩散系数（D）急剧下降，约为75%。混凝土体积电阻率数据证实，CI减缓氯离子在水泥基体内渗透的作用机制主要是由于其憎水作用。
