钢筋混凝土梁受盐雾腐蚀后的力学性能试验研究-结构工程专业论文.docxVIP

Dissertation Submitted to Hebei University of Technology for The Master Degree of Structural Engineering EXPERIMENTAL STUDY ON MECHANICAL PROPERTIES OF REINFORCED CONCRETE BEAMS CORRODED BY SALT FOG by Li Zhanwei Supervisor: Prof. Yan Xikang November 2011   河北工业大学硕士学位论文 钢筋混凝土梁受盐雾腐蚀后的力学性能 试验研究 i 钢筋混凝土梁受盐雾腐蚀后的力学性能试验研究 河北工业大学硕士学位论文  PAGE 4  PAGE 3 钢筋混凝土梁受盐雾腐蚀后的力学性能 试验研究 摘 要 我国幅员辽阔、海岸线绵长，因此钢筋混凝土结构耐久性问题具有复杂、普遍的特点。 而当今建筑业加速发展，钢筋混凝土结构的应用达到???空前的规模，必将导致在不久的将 来钢筋混凝土耐久性问题更加严重，其中滨海盐雾环境下的钢筋混凝土结构耐久性问题尤 为突出。本文以此为背景，通过 20 根钢筋混凝土试验梁的实验室加速腐蚀试验，来模拟 现实滨海盐雾环境中氯离子对钢筋混凝土构件的腐蚀，具体讨论了不同保护层厚度、不同 混凝土强度对受腐蚀钢筋混凝土梁的力学性能变化规律的影响，并以此为中心做了以下方 面研究： 通过文献研究并结合试验数据，总结了钢筋和混凝土两种材料受氯离子腐蚀机理。阐 明了氯离子腐蚀下钢筋的锈蚀状态；通过混凝土材料的力学性能试验研究，得到了受腐蚀 混凝土抗压强度的变化规律。 通过试验分析，得到了不同保护层厚度、不同混凝土强度的试验梁的承载力、开裂荷 载、破坏形态、延性等基本力学性能的变化规律。 基于混凝土受氯离子腐蚀的膨胀应力理论，提出了膨胀附加预应力的概念，并在此基 础上建立了试验梁开裂荷载的计算模型。 关键词：氯离子，钢筋混凝土，钢筋腐蚀，耐久性，力学性能  EXPERIMENTAL STUDY ON MECHANICAL PROPERTIES OF REINFORCED CONCRETE BEAMS CORRODED BY SALT FOG ABSTRACT China has a vast territory and long coastline, so the durability issues of reinforced concrete structures has features of complex and general. The development of todays construction industry has been accelerated, the application of reinforced concrete structures reached an unprecedented scale, so in the near future the durability problems of reinforced concrete structures will be more serious, and the durability problems of reinforced concrete structures in the coastal salt spray environment is particularly prominent. This paper takes this as background, to simulate the corrosion of reinforced concrete structures by the chlorine ions in the realistic coastal salt spray environment, By the test of 20 reinforced concrete beams. Specifically discussed the impact of different protective layer thickness and different concrete strength on the changes of mechanical properties of the corroded reinforced concrete beams. And conducted the following studies: By the experimental data and literature, summed up