Large-scale soil bio-cementation: insights into homogeneity, quality control, and waste handling
Large-scale soil bio-cementation: insights into homogeneity, quality control, and waste handling
This paper deals with challenges in large-scale soil bio-cementation. Introducing a novel treatment strategy with ex-situ hydrolysis in a 1000 L bioreactor, the study employs a state-of-the-art installation to inject hydrolyzed solutions into a 40 m2 area of 0–4 mm sand. A comprehensive multilevel quality control system monitors chemical and hydraulic processes across cycles, resulting in reaction efficiencies exceeding 80%. The paper discusses the gradual increase in pressure at the injection inlet, correlating with higher calcification levels. Findings indicate improved resistance in zones with higher injection pressure, demonstrating the efficacy of ex-situ bio-cementation. The study also explores the mechanical improvements, suggesting comparable results to traditional in-situ methods. Additionally, the paper addresses the monitoring of microbially induced calcium precipitation (MICP) at the geotechnical scale, highlighting the issue of residual ammonium reaching absorbed quantities of 4 mol/L.
Ray Harran; Dimitrios Terzis; M. Bueyueklue; Lyesse Laloui
18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)
E - Environment, water and energy
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