Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5436928 | Cement and Concrete Composites | 2017 | 11 Pages |
Abstract
Magnesium oxychloride cement (MOC) boards have the potential to offset carbon emissions through carbon mineralization, a process whereby carbon dioxide (CO2) is converted to carbonate minerals. Boards (0-15 years old) contained MOC phase 5 (21-50Â wt%), brucite, primary (e.g., magnesite) and secondary (hydromagnesite and chlorartinite) carbonate minerals. Quantitative mineralogy, electron microscopy and carbon abundance data demonstrate that secondary carbonates form through the reactions of MOC and brucite with CO2 within interfacial water layers after board manufacturing. Stable carbon isotopic data confirmed the source of sequestered CO2 as being from the atmosphere. Average carbonation rates were approximately 0.07Â kg CO2/m2 board/year or 9.8Â kg CO2/t board/year over 15 years, offsetting â¼20-40% of estimated carbon emissions. In experiments using 10% and 100% CO2 gas, carbonation was accelerated by approximately 400 and 1600 times in comparison to the passive rate. Integration of carbonation reactions into MOC board production could provide significant carbon offsets.
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Authors
Ian M. Power, Gregory M. Dipple, Peter S. Francis,