Effect of the soil type on the biocementation process by enzymatic way

Oliveira, Paulo J. Venda; Freitas, Luís de Souza

doi:10.1051/e3sconf/202019505008

Cited by 1 publication

(1 citation statement)

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“…The increased brittleness of the treated soil samples was also consistent with the typical stress-strain behaviour of soils stabilised with conventional chemical stabilisers such as cement or lime. However, in other studies of the group [21,28], the enzymatic treatment of a natural fine-grained organic soil of an organic matter content of 11% did not have a positive effect on the strength. A reason put forward for this was that SEM analysis showed that the organic matter was coating the mineral soil particles, thus potentially hindering the formation of bonds between the soil particles and the CaCO 3 crystals.…”

Section: Introductionmentioning

confidence: 65%

Towards the Development of Sustainable Ground Improvement Techniques—Biocementation Study of an Organic Soil

et al. 2021

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Ongoing research effort is dedicated to the development of innovative, superior and cost-effective ground improvement techniques to mitigate natural and man-made hazards while minimising waste and other environmental impacts. In this context, the nature-based process of biocementation of soils has been proposed as a potentially more sustainable technique than conventional chemical ground improvement practices. This paper focuses on the biocementation of an organic soil of the UK railway network. Having recently proven the feasibility of biocementing this soil using indigenous ureolytic bacteria, in this paper, the authors perform a parametric study to identify treatments successful in increasing the strength of the soil. Selected treatments are then applied to the soil to assess its volume change during consolidation, secondary compression and shrinkage upon drying. The results show that, depending on the treatments used, biocementation has increased the unconfined compressive strength by up to 81% compared to that of the control samples. For selected treatments and the range of water contents tested (55–33%), shrinkage upon drying reduced by 16%, while the volumetric strains of the soil upon 1-D compression reduced by 32–47%. This was reflected in the values of the coefficient of volume compressibility and the coefficient of secondary compression (the latter either reduced by up to an order of magnitude or secondary compression was not observed altogether in the testing period). Overall, the results proved that biocementation improved considerably the mechanical properties of the organic soil, which gives promise for addressing the settlement problems of this soil.

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Section: Introductionmentioning

confidence: 65%