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Feasibility of a soft biological improvement of natural soils used in compacted linear earth construction

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Abstract

Increasing demand for infrastructures requires innovative, cheap and environmental sustainable practices in construction. The soils which are available on site for linear embankments often need to be improved to satisfy the necessary performance and strength requirements. A bio-improvement is evaluated here, for use in compacted earth construction. To the aim of sustainability and cost reduction, a soft technique was chosen by the industrial party, which consisted in adding bacteria to a superficial soil retrieved in situ, and letting them precipitate calcium carbonate with the aid of the nutrients available in the organic matter of the soil and in the compaction water. The effects of the soft biological treatment on silty clayey sand were studied systematically in a comprehensive laboratory investigation, focused on the properties mostly affecting the performance of earth constructions: compaction energy, water retention, hydraulic conductivity, small-strain shear stiffness, collapse potential and shear strength. Mercury intrusion porosimetry tests and scanning electron microscopy were performed to help in providing a comprehensive picture of the consequences of the soft biological treatment on the natural soil. Lack in artificial nutrients reduces the efficiency of the biological treatment with respect to other cases reported in the literature. Nonetheless, organogenic aggregates and bonds are created during mixing and ageing, as detected from small-stiffness measurement during the curing time lapse. The bio-cemented bonds are mostly broken during compaction, while the aggregated structure remains, and the fine fraction generated by broken bonds ends in acting as filler of some inter-grain and inter-aggregate porosity. Eventually, the effects of the adopted technique on the hydro-mechanical behaviour of the compacted soil can be described in a coherent picture as the result of bio-filling of an aggregated compacted soil fabric.

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Acknowledgments

The initial part of the work was performed within the framework of BIOLIN project ‘Biotecnología de Obras Lineales’ between ACCIONA Infraestructuras and the University of Almería. The results presented herein are those of the authors only and do not, necessarily, reflect the views of the company (ACCIONA Infraestructuras). The first author wishes to acknowledge the University of Almería for providing research grant. Special thanks to the Department of Applied Biology (University of Almería) for assisting in the microbiological analysis. The authors acknowledge the contribution of Dr. Jubert Pineda in the experimental set-up and interpretation of the bender elements results.

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Authors and Affiliations

  1. Departamento de Ingenieria, Universidad de Almería, carretera Sacramento s/n, Cañada de San Urbano, 04120, Almería, Spain

    Laura Morales, Eduardo Garzón & Antonio Giménez

  2. Department of Geotechnical Engineering and Geosciences, Universitat Politècnica de Catalunya, c/Jordi Girona 1-3, Campus Nord UPC, Edificio D-2, 08034, Barcelona, Spain

    Enrique Romero

  3. Department of Geoscience and Engineering, Faculty of Civil Engineering and Geoscience, Delft University of Technology, Stevinweg 1, 2628 CN, Delft, The Netherlands

    Cristina Jommi

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  1. Laura Morales
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  2. Enrique Romero
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Correspondence to Enrique Romero.

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Morales, L., Romero, E., Jommi, C. et al. Feasibility of a soft biological improvement of natural soils used in compacted linear earth construction. Acta Geotech. 10, 157–171 (2015). https://doi.org/10.1007/s11440-014-0344-x

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