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Open AccessArticle

Durability and Aesthetics of Architectural Concrete under Chloride Attack or Carbonation

1
School of Qilu Transportation, Shandong University, Jinan 250002, China
2
School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China
3
Cooperative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone, Qingdao 266033, China
4
Qingdao Metro Group Co., Ltd. Qingdao 266000, China
5
School of Material Science and Engineering, Southeast University, Nanjing 211189, China
*
Authors to whom correspondence should be addressed.
Materials 2020, 13(4), 839; https://doi.org/10.3390/ma13040839
Received: 16 December 2019 / Revised: 9 February 2020 / Accepted: 10 February 2020 / Published: 12 February 2020
(This article belongs to the Special Issue Concrete and Construction Materials)
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.
Keywords: architectural concrete; marine environment; chloride penetration; carbonation; surface appearance architectural concrete; marine environment; chloride penetration; carbonation; surface appearance
MDPI and ACS Style

Chang, H.; Wang, P.; Jin, Z.; Li, G.; Feng, P.; Ye, S.; Liu, J. Durability and Aesthetics of Architectural Concrete under Chloride Attack or Carbonation. Materials 2020, 13, 839.

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