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Durability of R/C Structures Under Mechanical and Environmental Action

机译：机械和环境作用下R / C结构的耐久性

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摘要

In the present work, an experimental campaign on reinforced concrete elements subjected to simultaneous loading and degradation due to corrosion is presented. The specimens are loaded in tension and the cycling action is designed in order to simulate in terms of stress peak and stress variation, the effect of the passage of vehicles under fatigue design situations. The environmental action is simulated by means of corrosion induced with an electrochemical process; the corrosion rate is chosen in order to obtain about 27 years of equivalent carbonation attack within 25 days of test. In the mean time, 6.5 .10~6 loading cycles are achieved. In addition to those standard tests, also other static tests were conducted in order to have a comprehensive analysis of the deterioration processes. Evolution of transversal crack due to loading and of longitudinal cracks due to corrosion is monitored. They can be related to the internal bond condition between steel and concrete. Results highlight the differences in terms of corroded and uncorroded specimens, static and cycling test and also different loading amplitude. Finally it can be observed as the growing of the damage is significantly different when a cycling action, combined with a chemical attack, is present.
机译：在目前的工作中，提出了对钢筋混凝土构件同时承受载荷和由于腐蚀而退化的实验。试样承受张力，并设计自行车动作，以模拟应力峰值和应力变化，疲劳设计情况下车辆通过的影响。环境作用是通过电化学过程引起的腐蚀来模拟的；选择腐蚀速率是为了在测试的25天内获得约27年的等效碳酸化侵蚀时间。同时，实现了6.5 .10〜6个加载循环。除了这些标准测试之外，还进行了其他静态测试，以便对劣化过程进行全面分析。监测由于载荷引起的横向裂纹的发展以及由于腐蚀引起的纵向裂纹的发展。它们可能与钢和混凝土之间的内部粘结条件有关。结果突出了腐蚀和未腐蚀试样，静态和循环试验以及不同加载振幅方面的差异。最终，可以观察到，当存在循环动作并伴有化学侵蚀时，伤害的增长明显不同。

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