Effects of Limestone Powder on Chloride Concentration of Cement Paste.

Saved in:

Bibliographic Details
Title:	Effects of Limestone Powder on Chloride Concentration of Cement Paste.
Authors:	Wang, X.¹, Deng, W.², Zhang, Q.², Jia, X.², Chen, R.^3,4, Wang, M.³, Weng, L.⁵, Wang, D.⁶
Source:	ACI Materials Journal. Mar2026, Vol. 123 Issue 2, p181-191. 11p.
Subjects:	Limestone, Adsorption (Chemistry), Chloride content of water, Physisorption, Concrete additives, Cement slurry
Abstract:	The concentration of chloride ions involves both chemical binding and physical adsorption. This study investigated how limestone powder and supplementary cementitious materials (SCMs) synergistically affect chloride concentration in cement paste, using analyses of corrosion products, pore structure, and the chloride concentration coefficient. Cement pastes with 0 to 50% limestone powder and fly ash or slag were tested. Results showed that the synergy between limestone powder and fly ash or slag promoted carboaluminate formation, which completely converted to Friedel's salt in chloride environments. This enhanced chemical binding and increased physical adsorption of chloride ions, while reducing porosity and the most probable pore diameter. When limestone powder was 5 to 25% with fly ash less than 10%, or both limestone powder and slag were 20 to 30%, the chloride concentration coefficient reached its peak. Thus, proper limestone powder content improves chloride resistance by enhancing both chemical and physical chloride binding. [ABSTRACT FROM AUTHOR]
	Copyright of ACI Materials Journal is the property of American Concrete Institute and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database:	Engineering Source

Description
Abstract:	The concentration of chloride ions involves both chemical binding and physical adsorption. This study investigated how limestone powder and supplementary cementitious materials (SCMs) synergistically affect chloride concentration in cement paste, using analyses of corrosion products, pore structure, and the chloride concentration coefficient. Cement pastes with 0 to 50% limestone powder and fly ash or slag were tested. Results showed that the synergy between limestone powder and fly ash or slag promoted carboaluminate formation, which completely converted to Friedel's salt in chloride environments. This enhanced chemical binding and increased physical adsorption of chloride ions, while reducing porosity and the most probable pore diameter. When limestone powder was 5 to 25% with fly ash less than 10%, or both limestone powder and slag were 20 to 30%, the chloride concentration coefficient reached its peak. Thus, proper limestone powder content improves chloride resistance by enhancing both chemical and physical chloride binding. [ABSTRACT FROM AUTHOR]
ISSN:	0889325X
DOI:	10.14359/51749271