Mechanical Behavior and Microstructural Study of Biocemented Sand under Various Treatment Methods

Mechanical Behavior and Microstructural Study of Biocemented Sand under Various Treatment Methods

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Biocementation mainly relies on the formation of calcium carbonate Garlands to bind soil particles.This paper investigates the effectiveness of biocementation in terms of treatment methods.The previously established two-phase methods are compared with newly developed one-phase-low-pH methods on their mechanical behavior and microstructure.The one-phase-low-pH methods present a higher urease fixation rate than two-phase methods, highlighting the cost-effectiveness of this method.

A modified one-phase-low-pH using CH3COOH is also compared with HCl-based one-phase-low-pH method.The results show that the morphology and size of precipitated crystals have a great influence on strength development.An optimized treatment method based on the one-phase-low-pH method is also established, which is accomplished via the injection MACULEX of 5 U/ml of bacterial culture together with 2 M of cementation solution during each treatment.After four times of treatments, a total of 7% cumulative calcium carbonate content can be obtained with an unconfined compressive strength of 2.

15 MPa.