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Durability of R/C Structures Under Mechanical and Environmental Action

机译：机械和环境行动下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：在本作工作中，提出了一种对经过腐蚀引起的同时加载和降解的钢筋混凝土元件的实验运动。试样装载在张力中，并且设计循环作用，以便在应力峰值和应力变化方面进行模拟，车辆通过疲劳设计情况下的车辆通过的效果。通过用电化学工艺诱导的腐蚀模拟环境作用;选择腐蚀速率，以在试验后25天内获得约27年的等效碳化发作。在平均的时间内，实现了6.5×10〜6个装载周期。除了那些标准测试之外，还进行了其他静态测试，以便对恶化过程进行全面分析。监测由于腐蚀引起的负载和纵向裂缝引起的横向裂纹的演变。它们可以与钢和混凝土之间的内键状况有关。结果突出了腐蚀和未经定性的标本，静态和循环试验的差异以及也不同的装载幅度。最后，当存在循环动作与化学攻击结合时，由于损坏的损失的生长显着不同。

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