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dc.contributor.authorMorales, Laura
dc.contributor.authorRomero Morales, Enrique Edgar
dc.contributor.authorJommi, Cristina
dc.contributor.authorGarzón Garzón, Eduardo
dc.contributor.authorGiménez Fernández, Antonio
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament d'Enginyeria del Terreny, Cartogràfica i Geofísica
dc.date.accessioned2015-04-21T18:07:35Z
dc.date.created2015-02
dc.date.issued2015-02
dc.identifier.citationMorales, L. [et al.]. Feasibility of a soft biological improvement of natural soils used in compacted linear earth construction. "Acta geotechnica (Berlin)", Febrer 2015, vol. 10, núm. 1, p. 157-171.
dc.identifier.issn1861-1125
dc.identifier.urihttp://hdl.handle.net/2117/27500
dc.description.abstractIncreasing 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 interaggregate 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.
dc.format.extent15 p.
dc.language.isoeng
dc.subjectÀrees temàtiques de la UPC::Enginyeria civil::Geotècnia::Mecànica de sòls
dc.subject.lcshSoil stabilization
dc.subject.otherCompacted soil
dc.subject.otherHydro-mechanical properties
dc.subject.otherLaboratory investigation
dc.subject.otherMicrobiological treatment
dc.subject.otherMicrostructure
dc.subject.otherCALCIUM-CARBONATE PRECIPITATION
dc.subject.otherIN-SITU
dc.subject.otherSAND
dc.subject.otherMICROORGANISMS
dc.subject.otherLIMESTONE
dc.subject.otherBACTERIA
dc.subject.otherWATER
dc.subject.otherREINFORCEMENT
dc.subject.otherCEMENTATION
dc.subject.otherUREOLYSIS
dc.titleFeasibility of a soft biological improvement of natural soils used in compacted linear earth construction
dc.typeArticle
dc.subject.lemacSòls -- Estabilització
dc.contributor.groupUniversitat Politècnica de Catalunya. MSR - Mecànica del Sòls i de les Roques
dc.identifier.doi10.1007/s11440-014-0344-x
dc.description.peerreviewedPeer Reviewed
dc.relation.publisherversionhttp://link.springer.com/article/10.1007%2Fs11440-014-0344-x
dc.rights.accessRestricted access - publisher's policy
drac.iddocument15465348
dc.description.versionPostprint (published version)
dc.date.lift10000-01-01
upcommons.citation.authorMorales, L.; Romero, E.; Jommi, C.; Garzón, E.; Giménez, A.
upcommons.citation.publishedtrue
upcommons.citation.publicationNameActa geotechnica (Berlin)
upcommons.citation.volume10
upcommons.citation.number1
upcommons.citation.startingPage157
upcommons.citation.endingPage171


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