Novel Approach to Microscopic Characterization of Cryo Formation in Air Voids of Concrete

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dc.contributor.author Azarsa, Peiman
dc.contributor.author Gupta, Rishi
dc.date.accessioned 2020-07-13T14:11:36Z
dc.date.copyright 2019 en_US
dc.date.issued 2019
dc.identifier.citation Azarsa, P., & Gupta R. (2019). Novel approach to microscopic characterization of cryo formation in air voids of concrete. Micron, 122, 21-27. https://doi.org/10.1016/j.micron.2019.04.004. en_US
dc.identifier.uri https://doi.org/10.1016/j.micron.2019.04.004
dc.identifier.uri http://hdl.handle.net/1828/11928
dc.description.abstract Portland Cement Concrete (PCC) production is one of the major contributor to atmospheric Carbon Dioxide (CO2) emission. Geopolymer Concrete (GPC) as an alternative construction material has the potential to reduce CO2 emissions while creating durable structures. Freezing and thawing is an exemplary concrete deterioration mechanism that can cause widespread damage in concrete structures. Concrete structures exposed to freeze-thaw cycles delaminate due to expansive stresses induced when liquid converts to ice. There are numerous theoretical studies that have been done focused on capturing the effect of freeze-thaw cycles on microstructure of PCC. However, there is limited and no experimental work reported on cryo formation inside the air voids of PCC and GPC respectively. The main issue here is that most of the scanning electron microscopic devices cannot maintain the low temperature required to capture an image from a frozen sample. The amount of internal stress due to cryo formation and temperature range of cryo formation can be determined by investigation of morphology of the cryo products. Hence, in this study attempts have been made to investigate the morphology of the cryo formation inside the microstructure of GPC using a 4-D Low Temperature Scanning Electron Microscopic (4D-LTSEM). GPC specimens were frozen at -180 °C and were slowly sublimated to capture cryo creation in the paste. According to ASTM C666, nominal freezing temperature for PCC is −18 °C. So, the microstructure of GPC at −18 °C was investigated to find the applicability of ASTM C666 for paste tense. The results show that rate of cryo formation is slow from 0 °C to −18 °C indicating sufficient resistance of GPC when exposed to cold climates. en_US
dc.description.sponsorship The authors would like to acknowledge the financial supports from India-Canada Research Centre of Excellence (IC-IMPACTS), as well as extend their appreciation to Xin Zhang, lab technician in 4D LABS (Materials Science Research Institute) of Simon Fraser University. Authors also appreciate the discussion and comments from Dr. Elaine Humphrey, lab manager at Advanced Microscopy Facility of University of Victoria. en_US
dc.language.iso en en_US
dc.publisher Micron en_US
dc.subject Geopolymer concrete en_US
dc.subject Freeze-thaw en_US
dc.subject Cryo morphology en_US
dc.subject Low Temperature Scanning Electron Microscope en_US
dc.title Novel Approach to Microscopic Characterization of Cryo Formation in Air Voids of Concrete en_US
dc.type Postprint en_US
dc.description.scholarlevel Faculty en_US
dc.description.reviewstatus Reviewed en_US
dc.description.embargo 2021-04-24

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