Effect of Bacterial Solution Concentration on the Strength and Microstructure of Clay Solidified by SHMP Modified Bio-carbonated Reactive MgO Method
Every year,the dredging process inevitably produces abundant soft soils,and it is urgent to explore environmentally friendly and effective solidification methods to treat these soft soils.Bio-carbonated reactive MgO technology has good application prospects and sustainability in soil improvement.Sodium hexametaphosphate(SHMP),reactive MgO and urea hydrolysis induced by Bacillus pasteurii were introduced into soft soil solidification,and triaxial specimens with high initial moisture content were prepared with different dilution degrees of bacterial solution.Unconfined compressive strength tests and scanning electron microscope tests were carried out to investigate the influence of different dilutions of bacterial solution on the strength and microstructure of solidified specimens.The results show that the strength of slurry-like specimens can be obviously improved after curing for one day,and the maximum strength can exceed 1 MPa.As the concentration of bacterial solution decreased,the strength of the specimens decreased gradually,the cemented structure became sparser,and the particles were much looser.When the bacterial solution was diluted 3 times,the strength of the cured specimens was close to those without bacteria,which indicated that the bacterial solution could be properly diluted,but the dilution ratio should not exceed 2 times.
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