Preliminary Investigation of the Effects of EICP on Compaction and Unconfined Compression Strength of Sandy Soil
Preliminary Investigation of the Effects of EICP on Compaction and Unconfined Compression Strength of Sandy Soil
A laboratory study was conducted to examine the effect of enzyme-induced carbonate precipitation (EICP) on the compaction characteristics and unconfined compression strength (UCS) of clean sandy soil. The results were compared to both untreated soil and soil treated solely with calcium chloride (CaCl2) to isolate the effect of the enzyme. The testing showed that EICP treatment increased the maximum dry density and decreased the optimum moisture content (OMC) compared to untreated soil. In contrast, CaCl2 treatment had the opposite effect, reducing the maximum dry density and increasing the OMC. Furthermore, EICP treatment improved the peak stress by 79% and increased the elastic stiffness (i.e., the secant modulus at 50% of the failure stress) by over 440% compared to untreated soil. CaCl2 improved the strength by 46% and increased the secant modulus by 106% relative to untreated soil.
Saleh Alothman; Edward J. Kavazanjian; Claudia Zapata
2025 International Conference on Bio-mediated and Bio-inspired Geotechnics (ICBBG2025)
General session: Fundamental research on biogeotechnics
https://doi.org/10.53243/ICBBG2025-142
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