Comparison of Durability and Mechanism between Sprayed Concrete and Ordinary Concrete at Different Erosion Age
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 8
Abstract
The differences in corrosion between the erosion mechanisms of sprayed concrete (SpC) and ordinary concrete (OC) under sulfate attack at different corrosion ages were investigated in this paper. Here, 10% sodium sulfate was used to corrode SpC and OC under the condition of a 24-h drying-wetting cycle. The microdeterioration process and the change-rule of the durability of the two kinds of concrete are analyzed from the perspectives of microstructure and durability by means of scanning electron microscope (SEM) and relevant laboratory tests. The results show that the erosion products of SpC first accumulate in the original defects, such as pores and holes, whereas the erosion products of OC first concentrate on the surface of the specimen. Thereafter, the original defects in SpC are gradually filled and recracked, whereas OC is directly cracked. As a result, the corrosion resistance and durability of SpC is ultimately better than that of OC to some extent. Moreover, reported experiment data indicate that the damage degree and time of SpC and OC are different, and corrosion products can be detected before the deterioration degree of concrete increased significantly.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This project was supported by the National Natural Science Fund of China (Grant No. 51378071), and the Natural Science Foundation of Shaanxi Province of China (Grant No. 2130-2116-0351). The authors are grateful to the researchers for their support of the experimental study.
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Journal of Materials in Civil Engineering
Volume 33 • Issue 8 • August 2021
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© 2021 American Society of Civil Engineers.
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Received: Aug 7, 2020
Accepted: Nov 20, 2020
Published online: May 25, 2021
Published in print: Aug 1, 2021
Discussion open until: Oct 25, 2021
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