Ability of Hardened Paste of Cementitious Calcium–Aluminophosphate Mineral to Bind with Chloride Ions
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 5
Abstract
Phosphoaluminate cement (PAC) is a green cementing material with wide application prospects. Its main mineral compositions are calcium aluminate (CA), tricalcium phosphate , and calcium aluminophosphate (CAP). In this study, calcium aluminophosphate mineral was prepared in the laboratory, and its binding with chloride ions was investigated as a separate binder. The microstructure and the hydration and hardening process of the CAP paste were observed by X-ray computed tomography (XCT) and scanning electron microscopy (SEM), and the phase analysis of the hydration products before and after being soaked in sodium chloride solution was conducted using X-ray diffraction. The mechanism for the binding of the hardened CAP paste with chloride ions was also studied. The results show that the Freundlich isotherm well models the adsorption of chloride ions onto the hydration products. The binding of chloride ions with the CAP is chiefly attributed to the chemical bonding of the hydrated calcium aluminate with the ions, which is different from that with portland cement, largely caused by the physical adsorption of them onto the C─ S─ H gel.
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Data Availability Statement
The data used to support the findings of this study are available from the corresponding author upon request.
Acknowledgments
All the chemicals used were of analytical grade and were supplied by Xilong Chemical Co., Ltd., Chengdu, China. The deionized water was purchased from Duao Technology Co., Ltd., Shenzhen, China. The lifting smart water bath was produced by Yingyu High-tech Instrument Factory, Henan, China. The type of mechanical mixer was RW20 digital display, produced by IKA Group Laboratory Series Company, Germany. The BPG-65B high-temperature blast oven was supplied by Tongli Xinda Instrument Factory, Tianjin, China. The electric resistance furnace heated by silicon molybdenum rods was produced by Yifeng Electric Furnace Co., Ltd., Shanghai, China. The KC-1000 high-speed crusher was purchased from Kai Chuang Tong He Technology Development Co., Ltd., Beijing, China. The authors are grateful for the financial support of the National Natural Science Foundation of China (Grant No. 51472163). We also thank Papergoing (www.papergoing.com) for its linguistic assistance during the preparation of this manuscript.
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Received: Nov 24, 2020
Accepted: Sep 14, 2021
Published online: Feb 22, 2022
Published in print: May 1, 2022
Discussion open until: Jul 22, 2022
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