Microbial Carbonate Precipitation: Correlation of S-Wave Velocity with Calcite Precipitation
Publication: Geo-Frontiers 2011: Advances in Geotechnical Engineering
Abstract
The use of microbial induced precipitation as a soil improvement technique has been growing in geotechnical domains where ureolytic bacteria that raise the pH of the system and induce calcium carbonate (CaCO3) precipitation are used. For many applications, it is useful to assess the degree of CaCO3 precipitation by non-destructive testing. This study investigates the feasibility of S-wave velocity measurements to evaluate the amount of calcite precipitation by laboratory testing. Two sets of cemented specimen were tested. The first were samples terminated at different stages of cementation. The second were samples that went through different chemical treatments. These variations were made to find out if these factors would affect the S-wave velocity- cementation relationship. If chemical reaction efficiency was assumed to be constant throughout each test, the relationship between S-wave velocity (Vs) and the amount of CaCO3 precipitation was found to be approximately linear. This correlation between S-wave velocity and calcium carbonate precipitation validates its use as an indicator of the amount of calcite precipitation
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© 2011 American Society of Civil Engineers.
History
Published online: Apr 26, 2012
ASCE Technical Topics:
- [Inorganic compounds]
- Calcium carbonate
- Carbonation
- Cement
- Chemical processes
- Chemicals
- Chemistry
- Climates
- Concrete
- Continuum mechanics
- Correlation
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering materials (by type)
- Engineering mechanics
- Environmental engineering
- Laboratory tests
- Materials engineering
- Mathematics
- Meteorology
- Microbes
- Organic compounds
- Organisms
- Precipitation
- Solid mechanics
- Statistics
- Surface waves
- Tests (by type)
- Waves (mechanics)
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