Study on controlling the effect of chloride salt erosion and carbonation on the deterioration of shotcrete

DOI

10.2991/978-94-6463-435-8_22How to use a DOI?

Keywords

shotcrete; disaster prevention; aggregate type; deterioration mechanism

Abstract

With the continuous expansion of the marine construction industry in various countries, the number of large-scale marine engineering structures made of concrete, such as bay bridge, port terminals, submarine tunnels etc., is increasing annually. Therefore, it is urgent to study the deterioration mechanism of marine concrete and its disaster prevention and control. In this paper, five types of concrete specimens such as cement paste, cement mortar, and concrete were made and cured under standard curing, carbonation curing, and NaCl erosion conditions for each type of concrete specimens. The results showed that the strengths of cement paste, mortar and concrete were gradually increasing at the same water-cement ratio, which was due to the addition of fine aggregate in mortar densified the pores and cracks of the cement paste and made it more structurally complete, while the addition of coarse aggregate in the concrete assumed a greater mechanical strength. And the microscopic results showed that with the addition of polymer, the structure became dense, and the combination of hydration product C-S-H gel and crystals became closer; when fly ash was added, the encapsulation effect of hydration gel product on unhydrated mineral admixture and crystals was poorer compared with that of ordinary concrete, and microcracks on the cross section also increased significantly, which ultimately led to weaker carbonation resistance.

Copyright

© 2024 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Huamou Liu
AU  - Wanyun Lu
AU  - Guoming Liu
PY  - 2024
DA  - 2024/06/13
TI  - Study on controlling the effect of chloride salt erosion and carbonation on the deterioration of shotcrete
BT  - Proceedings of the 2024 5th International Conference on Civil, Architecture and Disaster Prevention and Control (CADPC 2024)
PB  - Atlantis Press
SP  - 180
EP  - 196
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-435-8_22
DO  - 10.2991/978-94-6463-435-8_22
ID  - Liu2024
ER  -