Effect of Surface Treatment on the Transport Properties of Hardened Sulphoaluminate Cement Pastes after Carbonation

DOI

10.2991/978-94-6463-658-1_67How to use a DOI?

Keywords

Sulphoaluminate cement; surface treatment; carbonation; transport properties

Abstract

Sulphoaluminate (CSA) cement has the advantage of fast-hardening and high early-strength, but the carbonation resistance is relatively poor. In order to enhance the impermeability of carbonated CSA cement pastes, this paper investigates the effects of ethyl orthosilicate (TEOS) surface treatment with and without the pretreatment of calcium formate solution (10 wt.%) on the impermeability of carbonated CSA cement pastes. The results showed that the TEOS surface treatment without pretreatment would reduce the water absorption of the uncarbonated CSA cement pastes by only ~ 6.3%, and water absorption of the carbonated CSA cement pastes was reduced even less, as respected. However, the water absorption of (un)carbonated CSA cement pastes was significantly reduced by the TEOS treatment with the pretreatment of calcium formate solution (by ~ 38.7% and ~ 42.7%, respectively). Rietveld analysis of their X-ray diffraction patterns showed that the pretreatment of calcium formate solution would significantly reduce the content of ettringite of hardened CSA cement pastes by 63%, and increase the amorphous amount by 40%. The further surface treatment of TEOS would hardly change the phase assemblage any more. This means that the pretreatment of calcium formate solution could be an important reason for the reduction in the water absorption. A new method that can significantly enhance the impermeability of carbonated CSA cement pastes is proposed, which can provide an important basis for surface strengthening and durability enhancement of in-service CSA cement structures.

Copyright

© 2025 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  - Minghao Mu
AU  - Xiaojun Hao
AU  - Hongbo Cao
AU  - Chongyu Huang
PY  - 2025
DA  - 2025/03/03
TI  - Effect of Surface Treatment on the Transport Properties of Hardened Sulphoaluminate Cement Pastes after Carbonation
BT  - Proceedings of the 2024 10th International Conference on Architectural, Civil and Hydraulic Engineering (ICACHE 2024)
PB  - Atlantis Press
SP  - 655
EP  - 666
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-658-1_67
DO  - 10.2991/978-94-6463-658-1_67
ID  - Mu2025
ER  -