Carbonation Process of Reinforced Concrete Beams under the Combined Effects of Fatigue Damage and Environmental Factors
Carbonation Process of Reinforced Concrete Beams under the Combined Effects of Fatigue Damage and Environmental Factors
复制标题
疲劳损伤与环境因素共同作用下钢筋混凝土梁碳化过程
DOI：
10.3390/app10113981
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发表时间：
2020-06
影响因子：
2.7
通讯作者：
Hou Jian
中科院分区：
文献类型：
--
作者：
Song Li;Liu Jin-liang;Cui Chen-xing;Yu Zhi-wu;Fan Zhi-wei;Hou Jian
基于气象环境数据，在环境模拟箱中对考虑疲劳荷载和环境因素共同作用的钢筋混凝土（RC）梁碳化过程进行了试验研究。通过14根混凝土梁的碳化试验，建立了考虑介质传输和疲劳损伤特性的混凝土碳化数值模型（CNM），模拟了混凝土梁的碳化过程。基于试验结果，CNM扩展到揭示环境温度，相对湿度，二氧化碳浓度，和疲劳损伤对钢筋混凝土梁碳化过程的影响。结果表明，混凝土孔结构的变化可以直观、准确地表征疲劳损伤对混凝土输运特性的影响。混凝土的孔隙率随着疲劳损伤程度的增加而显著增加。疲劳损伤对混凝土的最可几孔半径没有显著影响，但最可几孔的总孔容显著增加。结果表明，碳化深度和疲劳损伤均呈现三阶段发展规律。碳化深度和碳化速率与混凝土孔隙和宏观裂缝有关。在疲劳损伤钢筋混凝土梁碳化分析中，应同时考虑碳化引起的孔结构和疲劳裂纹的变化。
The carbonation process of reinforced concrete (RC) beams considering the combined effect of fatigue load and environmental factors was investigated experimentally in an environmental simulation chamber based on meteorological environmental data. Fourteen beams were constructed and tested, and a carbonation numerical model (CNM) considering medium transport and fatigue damage characteristics was proposed to simulate the carbonation process of RC beams. Based on the experimental results, CNM is extended to reveal the effects of ambient temperature, relative humidity, carbon dioxide concentration, and fatigue damage on the carbonation process of RC beams. The results showed that the change in the pore structure of concrete can directly and accurately characterize the effect of fatigue damage on the transport characteristics of concrete. The porosity of concrete substantially increased with increasing levels of fatigue damage. Although fatigue damage did not have a significant effect on the most probable pore radius of the concrete, the total pore volume of the most probable pore notably increased. The results showed that both the carbonation depth and fatigue damage exhibit a three-stage development law. The depth and rate of carbonation are related to concrete pores and macroscopic cracks. In the carbonation analysis of fatigue-damaged RC beams, the changes in both the pore structure and fatigue cracks caused by repeated fatigue loading on carbonation should be considered.
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影响因子：
5.3
作者：
Z. Bažant;M. Hubler
通讯作者：
Z. Bažant;M. Hubler
影响因子：
11.4
作者：
Song, Ha-Won;Kwon, Seung-Jun;Park, Chan-Kyu
通讯作者：
Park, Chan-Kyu
影响因子：
11.4
作者：
Vidal, T;Castel, A;François, R
通讯作者：
François, R
影响因子：
11.4
作者：
Johannesson, B;Utgenannt, P
通讯作者：
Utgenannt, P
影响因子：
2.7
作者：
Lye, Chao-Qun;Dhir, Ravindra K.;Ghataora, Gurmel S.
通讯作者：
Ghataora, Gurmel S.