Full metadata
Title
Sustainable Soil Improvement via Abiotic Carbon Dioxide Sequestration
Description
Calcium hydroxide carbonation processes were studied to investigate the potential for abiotic soil improvement. Different mixtures of common soil constituents such as sand, clay, and granite were mixed with a calcium hydroxide slurry and carbonated at approximately 860 psi. While the carbonation was successful and calcite formation was strong on sample exteriors, a 4 mm passivating boundary layer effect was observed, impeding the carbonation process at the center. XRD analysis was used to characterize the extent of carbonation, indicating extremely poor carbonation and therefore CO2 penetration inside the visible boundary. The depth of the passivating layer was found to be independent of both time and choice of aggregate. Less than adequate strength was developed in carbonated trials due to formation of small, weakly-connected crystals, shown with SEM analysis. Additional research, especially in situ analysis with thermogravimetric analysis would be useful to determine the causation of poor carbonation performance. This technology has great potential to substitute for certain Portland cement applications if these issues can be addressed.
Date Created
2015-05
Contributors
- Hermens, Stephen Edward (Author)
- Bearat, Hamdallah (Thesis director)
- Dai, Lenore (Committee member)
- Mobasher, Barzin (Committee member)
- Barrett, The Honors College (Contributor)
- Chemical Engineering Program (Contributor)
Topical Subject
Resource Type
Extent
43 pages
Language
Copyright Statement
In Copyright
Primary Member of
Series
Academic Year 2014-2015
Handle
https://hdl.handle.net/2286/R.I.29350
Level of coding
minimal
Cataloging Standards
System Created
- 2017-10-30 02:50:57
System Modified
- 2021-08-11 04:09:57
- 2 years 8 months ago
Additional Formats