地铁钢筋腐蚀特性对混凝土抗压强度的影响

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基于室内加速腐蚀试验,采用氧离子外渗法研究了杂散电流和氧离子共同作用下地铁钢筋的腐蚀特性及对混凝土抗压强度的影响。研究结果表明:杂散电流和氯离子共同作用下地铁钢筋的腐蚀发展,与杂散电流、氧离子单一因素作用下的腐蚀发展相比更快,且杂散电流强度和氧离子浓度越大越显著。地铁混凝土抗压强度因钢筋腐蚀均有不同程度的降低,其中又以杂散电流和氧离子共同作用下混凝土抗压强复的损失最为显著。电化学腐蚀测试表明,导致杂散电流和氯离子共同作用下地铁混凝土抗压强度显著下降主要源于杂散电流和氧离子之间存在交互作用。
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