Carbonation Behavior of Powdered Cement-Based Materials under Different Relative Humidities and CO2Concentrations

Kiyofumi Nakada; Katsuhito Komiya; Hikaru Fumino; Yuhei Nishio; Manabu Kanematsu; Takafumi Noguchi

doi:10.23967/dbmc.2020.018

Carbonation Behavior of Powdered Cement-Based Materials under Different Relative Humidities and CO₂Concentrations

Kiyofumi Nakada, Katsuhito Komiya, Hikaru Fumino, Yuhei Nishio, Manabu Kanematsu, Takafumi Noguchi

Department of Architecture

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

The aim of the current study is to investigate the carbonation behavior of cement hydrates at different environments. Hardened cement pastes are prepared using OPC and BFS and crushed into ~90μm powder. The powder samples are carbonated at 5/20% CO₂and at 60/85%RH. TGA, XRD and phenolphthalein tests are conducted before and after carbonation. The results show that CH remain uncarbonated even after CO₂uptake apparently ended and that the amount of the residual CH affects the results of phenolphthalein test. External humidity strongly affects the carbonation behavior of both CH and other hydrates. The degree of CH carbonation is greater at higher humidity, while the degree of other hydrates carbonation is greater at lower humidity. This conflicting effect can occur at surface of bulk concretes and changes in its properties (coarsening of pore structure and cracking) can be caused without apparent carbonation detected by phenol phthalein test. The effect of relative humidity on CSH carbonation should be taken into consideration when estimating long-term performance of carbonated concretes.

Original language	English
Title of host publication	Current Topics and Trends on Durability of Building Materials and Components - Proceedings of the 15th International Conference on Durability of Building Materials and Components, DBMC 2020
Editors	Carles Serrat, Joan Ramon Casas, Vicente Gibert i Armengol
Publisher	International Center for Numerical Methods in Engineering
Pages	1265-1272
Number of pages	8
ISBN (Electronic)	9788412110180
DOIs	https://doi.org/10.23967/dbmc.2020.018
Publication status	Published - 2020
Event	15th International Conference on Durability of Building Materials and Components, DBMC 2020 - Virtual, Online, Spain Duration: 20 Oct 2020 → 23 Oct 2020

Publication series

Name	Current Topics and Trends on Durability of Building Materials and Components - Proceedings of the 15th International Conference on Durability of Building Materials and Components, DBMC 2020

Conference

Conference	15th International Conference on Durability of Building Materials and Components, DBMC 2020
Country/Territory	Spain
City	Virtual, Online
Period	20/10/20 → 23/10/20

Keywords

BFS
Carbonation
OPC
Phenolphthalein test
Relative humidity

Access to Document

10.23967/dbmc.2020.018

Cite this

Nakada, K., Komiya, K., Fumino, H., Nishio, Y., Kanematsu, M., & Noguchi, T. (2020). Carbonation Behavior of Powdered Cement-Based Materials under Different Relative Humidities and CO₂Concentrations. In C. Serrat, J. R. Casas, & V. Gibert i Armengol (Eds.), Current Topics and Trends on Durability of Building Materials and Components - Proceedings of the 15th International Conference on Durability of Building Materials and Components, DBMC 2020 (pp. 1265-1272). (Current Topics and Trends on Durability of Building Materials and Components - Proceedings of the 15th International Conference on Durability of Building Materials and Components, DBMC 2020). International Center for Numerical Methods in Engineering. https://doi.org/10.23967/dbmc.2020.018

Nakada, Kiyofumi ; Komiya, Katsuhito ; Fumino, Hikaru et al. / Carbonation Behavior of Powdered Cement-Based Materials under Different Relative Humidities and CO₂Concentrations. Current Topics and Trends on Durability of Building Materials and Components - Proceedings of the 15th International Conference on Durability of Building Materials and Components, DBMC 2020. editor / Carles Serrat ; Joan Ramon Casas ; Vicente Gibert i Armengol. International Center for Numerical Methods in Engineering, 2020. pp. 1265-1272 (Current Topics and Trends on Durability of Building Materials and Components - Proceedings of the 15th International Conference on Durability of Building Materials and Components, DBMC 2020).

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abstract = "The aim of the current study is to investigate the carbonation behavior of cement hydrates at different environments. Hardened cement pastes are prepared using OPC and BFS and crushed into ~90μm powder. The powder samples are carbonated at 5/20% CO2and at 60/85%RH. TGA, XRD and phenolphthalein tests are conducted before and after carbonation. The results show that CH remain uncarbonated even after CO2uptake apparently ended and that the amount of the residual CH affects the results of phenolphthalein test. External humidity strongly affects the carbonation behavior of both CH and other hydrates. The degree of CH carbonation is greater at higher humidity, while the degree of other hydrates carbonation is greater at lower humidity. This conflicting effect can occur at surface of bulk concretes and changes in its properties (coarsening of pore structure and cracking) can be caused without apparent carbonation detected by phenol phthalein test. The effect of relative humidity on CSH carbonation should be taken into consideration when estimating long-term performance of carbonated concretes.",

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Nakada, K, Komiya, K, Fumino, H, Nishio, Y, Kanematsu, M & Noguchi, T 2020, Carbonation Behavior of Powdered Cement-Based Materials under Different Relative Humidities and CO₂Concentrations. in C Serrat, JR Casas & V Gibert i Armengol (eds), Current Topics and Trends on Durability of Building Materials and Components - Proceedings of the 15th International Conference on Durability of Building Materials and Components, DBMC 2020. Current Topics and Trends on Durability of Building Materials and Components - Proceedings of the 15th International Conference on Durability of Building Materials and Components, DBMC 2020, International Center for Numerical Methods in Engineering, pp. 1265-1272, 15th International Conference on Durability of Building Materials and Components, DBMC 2020, Virtual, Online, Spain, 20/10/20. https://doi.org/10.23967/dbmc.2020.018

Carbonation Behavior of Powdered Cement-Based Materials under Different Relative Humidities and CO₂Concentrations. / Nakada, Kiyofumi; Komiya, Katsuhito; Fumino, Hikaru et al.
Current Topics and Trends on Durability of Building Materials and Components - Proceedings of the 15th International Conference on Durability of Building Materials and Components, DBMC 2020. ed. / Carles Serrat; Joan Ramon Casas; Vicente Gibert i Armengol. International Center for Numerical Methods in Engineering, 2020. p. 1265-1272 (Current Topics and Trends on Durability of Building Materials and Components - Proceedings of the 15th International Conference on Durability of Building Materials and Components, DBMC 2020).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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Nakada K, Komiya K, Fumino H, Nishio Y, Kanematsu M, Noguchi T. Carbonation Behavior of Powdered Cement-Based Materials under Different Relative Humidities and CO₂Concentrations. In Serrat C, Casas JR, Gibert i Armengol V, editors, Current Topics and Trends on Durability of Building Materials and Components - Proceedings of the 15th International Conference on Durability of Building Materials and Components, DBMC 2020. International Center for Numerical Methods in Engineering. 2020. p. 1265-1272. (Current Topics and Trends on Durability of Building Materials and Components - Proceedings of the 15th International Conference on Durability of Building Materials and Components, DBMC 2020). doi: 10.23967/dbmc.2020.018