山东沿海钢筋混凝土公路桥的劣化破坏及其对策的研究

Study on the deterioration and destruction and its countermeasures for high way bridges along the coast in ShanDong

山东沿海的一些钢筋混凝土公路桥,由于盐害、冻害、中性化作用等多种劣化因子作用,投入使用10年左右,混凝土出现严重的损伤开裂,钢筋严重锈蚀,保护层剥落。虽经维修加固,2～3年后仍出现腐蚀破坏,有些桥梁需要重建。调查表明,原设计混凝土标号过低,保护层过薄,桥面排水不当,加速了劣化过程。其主要对策是针对不同环境条件的劣化因子,进行耐久性设计。

The high way bridges along the coast in ShanDong have been wrecked by neutralization,freezing and thawing,chloride attack and sulfate attack during ten years.The deterioration is accelerated because the strength grade of concrete is too low,depth of cover too thin,and drain off water unsuitable.The main coutermeasures are durable design for concrete construction