Effects of drying techniques on the crystal structure and morphology of ettringite

•D-drying is the most damaging drying method to ettringite crystal structure.•Vacuum drying with isopropanol pre-treatment preserves ettringite crystal well.•Isopropanol as well as acetone and ethanol can make ettringite prone to carbonation. This study reports on the extent to which common drying m...

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Bibliographic Details
Published in:Construction & building materials 2019-01, Vol.195, p.305-311
Main Authors: Luo, Shuqiong, Liu, Min, Yang, Lei, Chang, Jindan
Format: Article
Language:English
Subjects:
Acetone
Analysis
Backup software
Crystal structure
Drying methods
Electric properties
Ethanol
Ettringite
Mechanical properties
Methods
Morphology
Portland cement
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Summary:•D-drying is the most damaging drying method to ettringite crystal structure.•Vacuum drying with isopropanol pre-treatment preserves ettringite crystal well.•Isopropanol as well as acetone and ethanol can make ettringite prone to carbonation. This study reports on the extent to which common drying methods, namely D-drying, oven-drying and vacuum-drying affect the structure and morphology of ettringite produced in the laboratory. In some cases, ettringite was washed with acetone, ethanol or isopropanol to remove excess water before drying. Results show that D-drying is the worst drying method in that it severely decomposes ettringite to form amorphous products of various composition, whereas vacuum-drying (either alone or used in combination with isopropanol washing) causes little damage to ettringite. Results also reveal that all organic solvents used in this study make ettringite samples susceptible to forming calcium carbonate.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2018.11.078