This research paper discusses an experimental study aimed at enhancing the durability of mortar coating on pre-stressed concrete cylindrical pipes (PCCP) exposed to corrosive soil. Two mortar coating mixtures were studied: a control mixture before and after adding 17% fly ash. The specimens were exposed to Kenitra soil (non-aggressive soil) and Errachidia soil (the most aggressive environment). Several electrochemical techniques have been used such as open circuit potential (OCP), the linear polarization resistance (LPR) and electrochemical impedance spectroscopy (EIS) to assess the corrosion of steel wire coated with thick mortar coatings mixture under accelerated corrosion by an impressed constant voltage. The visual examination, Scanning Electron Microscopy (SEM) coupled with EDS analysis, Chloride penetration depth, and carbonation depth were performed to confirm experimental results. The results indicated that the fly ash blending in mortar coatings of prestressed concrete cylinder pipe (PCCP) improves the corrosion resistance of the prestressed wires in despite the strong and prolonged attack by aggressive soil.

本研究论文讨论了一项旨在提高暴露在腐蚀性土壤中的预应力混凝土圆柱管（PCCP）上砂浆涂层耐久性的实验研究。研究了两种砂浆涂料混合物：添加17％粉煤灰之前和之后的对照混合物。标本暴露于Kenitra土壤（非侵蚀性土壤）和Errachidia土壤（最具侵蚀性的环境）。已经使用了几种电化学技术，例如开路电势（OCP），线性极化电阻（LPR）和电化学阻抗谱（EIS）来评估在施加恒定电压的加速腐蚀下，涂有厚实砂浆涂料混合物的钢丝的腐蚀。目测，扫描电子显微镜（SEM）和EDS分析，氯离子渗透深度，进行碳化和深度测定以证实实验结果。结果表明，尽管侵蚀性土壤长期强烈侵蚀，但预应力混凝土圆筒管（PCCP）砂浆涂料中的粉煤灰掺合仍提高了预应力钢丝的耐腐蚀性。