本文通过混凝上中钢筋锈蚀程度发展对保护层开裂和钢筋力学性能影响的研究，给出了过程中各影响因素间量变关系的试验结论。对建设工程钢筋混凝上方案设计、原材料的选用、施工方法和钢筋保护措施的确定，对己建成构筑物的修补和继续使用进行评定，对保证铁路工程构筑物长期安全性等都具有重要的实际意义。

Based on the study on developing corrosion degree of reinforcing bars in concrete and its influence on the crack of protective layer and the mechanics properties of reinforcing bars, the experimental conclusions on the quantitative change relationship between the different influence factors in its progress are proposed. They have important practical meanings on following aspects: design of reinforced concrete scheme for construction projects, selection of raw materials, construction methods and determination of protective measures for reinforcing bars, repair of built structures and evaluation of its continuous operation, guarantee long-term safety of railway engineering structures, etc.