Durability and Aesthetics of Architectural Concrete under Chloride Attack or Carbonation
Durability and Aesthetics of Architectural Concrete under Chloride Attack or Carbonation
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氯化物侵蚀或碳化作用下建筑混凝土的耐久性和美观性
DOI：
10.3390/ma13040839
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发表时间：
2020-02-02
期刊：
影响因子：
3.4
通讯作者：
Liu, Jian
中科院分区：
文献类型：
--
作者：
Chang, Honglei;Wang, Penggang;Liu, Jian
建筑混凝土在海洋环境中的应用越来越广泛，但在海洋环境中使用的混凝土往往会发生氯离子渗透和碳化。为了评估建筑混凝土的保护和装饰性能，本研究将建筑混凝土暴露于实际的海洋环境和加速碳化条件下。通过测定建筑混凝土的抗氯盐和碳化性能来评价其防护性能，并采用相应的表面颜色一致性来表征其装饰性能。结果表明：海洋大气区和潮汐区混凝土中总氯离子和游离氯离子含量随深度增加而降低;氯离子含量随暴露时间变化显著，在表层附近有一个最大氯离子峰。此外，氯离子扩散系数在整个测量过程中都很小，表明建筑混凝土的抗氯离子性上级。此外，根据碳化试验得到的碳化深度数据，建筑混凝土还具有优良的抗碳化性能。因此，作为保护层的建筑混凝土既能承受氯离子侵蚀，又能承受碳化。此外，碳化被发现对建筑混凝土的美学有着深远的影响。因此，应谨慎处理碳化，以更好地保持建筑混凝土在长期使用中的美观。
Architectural concrete has been wildly used nowadays, and those served in an offshore environment often suffer from chloride penetration and carbonation. To assess the protection and decoration performances of architectural concrete, this study exposed architectural concrete to actual marine environments and accelerated carbonation conditions. The chloride and carbonation resistance of architectural concrete was determined to evaluate the protection performance, and the corresponding surface-color-consistency was adopted to characterize its decoration performance. The results show that the total and free chloride of concrete in the marine atmosphere zone and the tidal zone generally decreases with depth; chloride content arguments significantly with exposure time, with a chloride maximum peak near the surface. Moreover, the chloride diffusion coefficient is small throughout the measurements, indicating the superior chloride resistance of architectural concrete. Furthermore, architectural concrete also possesses excellent carbonation resistance based on the carbonation depth data obtained from the carbonation experiment. Therefore, architecture concrete served as protection covers can withstand both the chloride attack and carbonation tested in this paper. In addition, carbonation was found to have a profound influence on the aesthetics of architectural concrete. Therefore, carbonation should be carefully handled for better maintaining the aesthetic appearance of architectural concrete in long-term service.