Geo-Congress 2020
Experimental Study to Determine an EICP Application Method Feasible for Field Treatment for Soil Erosion Control
Publication: Geo-Congress 2020: Biogeotechnics (GSP 320)
ABSTRACT
The end goal of this research is assessing the feasibility of using enzyme induced carbonate precipitation (EICP) to create a cemented top layer to control runoff erosion in sloping sandy soil. The paper presents the results of an experimental study of bench-scale tests on EICP-treated sands to determine a treatment method feasible for field placement for this application. The soils tested were two natural sands and Ottawa 20–30 sand used as control. The EICP application methods were percolation by gravity, one-step mix-compact, and two-step mix-compact. Other conditions considered were pre-rinsing the sand prior to treatment, adjusting soil pH prior to treatment, and changing the EICP solution concentration. Promising results for this field application were obtained using the two-step mix-compact when the soil was first mixed with the urease enzyme solution before compaction. Considering that the EICP reaction starts once all components are added, this method would ensure that the reaction does not take place before the protective layer of treated soil has been installed. The effect of pre-rinsing the natural sand was not consistent throughout the testing conditions and its role in improving soil cementation in natural sand needs further study.
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ACKNOWLEDGEMENTS
This material is based upon work supported by the National Science Foundation (NSF) under NSF CA No. EEC-1449501. Any opinions, findings and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect those of the NSF. This is a project in collaboration with the Center for Bio-mediated and Bio-inspired Geotechnics’ (CBBG) EICP research team at Arizona State University (ASU) led by Professor Edward Kavazanjian, Jr. They have provided valuable information and guidance to this research. Dr. Hamed Khodadadi of CBBG at ASU provided important information and advice on the EICP process and techniques. Jason Alcantar, graduate research assistant at New Mexico State University, and Shantal Smart, participant in CBBG’s Research Experience for Undergraduates (REU) Program, helped with laboratory testing. Lucas Rivera was a participant of the New Mexico Alliance for Minority Participation Undergraduate Research Scholar (URS) Program.
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Information & Authors
Information
Published In
Geo-Congress 2020: Biogeotechnics (GSP 320)
Pages: 205 - 213
Editors: Edward Kavazanjian Jr., Ph.D., Arizona State University, James P. Hambleton, Ph.D., Northwestern University, Roman Makhnenko, Ph.D., University of Illinois at Urbana-Champaign, and Aaron S. Budge, Ph.D., Minnesota State University, Mankato
ISBN (Online): 978-0-7844-8283-4
Copyright
© 2020 American Society of Civil Engineers.
History
Published online: Feb 21, 2020
Published in print: Feb 21, 2020
ASCE Technical Topics:
- Engineering fundamentals
- Engineering materials (by type)
- Environmental engineering
- Erosion
- Feasibility studies
- Field tests
- Geology
- Geomechanics
- Geotechnical engineering
- Materials engineering
- Methodology (by type)
- Pollution
- Research methods (by type)
- Sandy soils
- Soil analysis
- Soil cement
- Soil mechanics
- Soil pollution
- Soil properties
- Soil treatment
- Soils (by type)
- Tests (by type)
Authors
Metrics & Citations
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