Durability of Slag–Cement Paste Containing Polyaluminum Chloride
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 9
Abstract
The effect of polyaluminum chloride (PAC) on the durability, microstructure, and corrosion sensitivity of slag–cement pastes was investigated in this research. Various experimental tests were performed to assess the mechanical properties (compressive strength test), durability (rapid chloride migration test, water permeability test, capillary water absorption test, chloride binding test, accelerated carbonation test), microstructure (scanning electron microscopy, X-ray diffraction, mercury intrusion porosimetry), and corrosion sensitivity (accelerated corrosion sensitivity, initial chloride concentration). Experimental results showed that adding 1.5% PAC increased compressive strength by 77.0%, 53.8%, and 19.4% at 3, 7, and 28 days. Resistance to chloride migration, water permeation, capillary water absorption, and carbonation was improved. These results were consistent with the microstructural analysis, which showed that adding PAC facilitated the formation of Friedel’s salt and development of pore structure, which was the key factor for the improved durability of the slag–cement paste. Adding 1.5% PAC had a limited influence on the corrosion sensitivity despite introducing the additional chloride ions into the system. These results promote the further practical application of PAC.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors gratefully acknowledge the financial support provided by the Science and Technology Project of Shenzhen, China (Nos. JCYJ20180305124844894 and JCYJ20190808151011502) and the National Natural Science Foundation of China, NSFC-Shandong Joint Fund (No. U2006223).
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Journal of Materials in Civil Engineering
Volume 33 • Issue 9 • September 2021
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© 2021 American Society of Civil Engineers.
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Received: Sep 1, 2020
Accepted: Jan 20, 2021
Published online: Jul 7, 2021
Published in print: Sep 1, 2021
Discussion open until: Dec 7, 2021
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