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    Biogrouting Method for Stronger Bond Strength for Aggregates

    Source: Journal of Geotechnical and Geoenvironmental Engineering:;2020:;Volume ( 146 ):;issue: 011
    Author:
    Chuangzhou Wu
    ,
    Jian Chu
    DOI: 10.1061/(ASCE)GT.1943-5606.0002386
    Publisher: ASCE
    Abstract: Microbial-induced carbonate precipitation (MICP) methods have been developed in recent years for soil improvement to simultaneously increase the shear strength and reduce the permeability of soil or aggregate. However, this method is difficult to use for aggregate because many more injections are required. This technical note proposes a new biogrouting method for aggregates. In this method, biogrout solution containing bioslurry is injected before injection of cementation solution alone into aggregate, which is kept in an unsaturated state. Due to the capillary effect, more calcium carbonate crystals in the bioslurry are retained around the contact points of the particles, rather than in the pores. As a result, this method can achieve a higher shear strength (2.98 MPa) for biogrouted aggregate compared with that using other MICP methods (0.78 MPa) at the same level of calcium carbonate content. Therefore, the permeability reduction also is smaller using this method. The proposed method can be used for applications which require only an increase in strength, such as for granular base for pavement or the toe drainage of a slope.
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      Biogrouting Method for Stronger Bond Strength for Aggregates

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4268992
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    contributor authorChuangzhou Wu
    contributor authorJian Chu
    date accessioned2022-01-30T21:52:52Z
    date available2022-01-30T21:52:52Z
    date issued11/1/2020 12:00:00 AM
    identifier other%28ASCE%29GT.1943-5606.0002386.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4268992
    description abstractMicrobial-induced carbonate precipitation (MICP) methods have been developed in recent years for soil improvement to simultaneously increase the shear strength and reduce the permeability of soil or aggregate. However, this method is difficult to use for aggregate because many more injections are required. This technical note proposes a new biogrouting method for aggregates. In this method, biogrout solution containing bioslurry is injected before injection of cementation solution alone into aggregate, which is kept in an unsaturated state. Due to the capillary effect, more calcium carbonate crystals in the bioslurry are retained around the contact points of the particles, rather than in the pores. As a result, this method can achieve a higher shear strength (2.98 MPa) for biogrouted aggregate compared with that using other MICP methods (0.78 MPa) at the same level of calcium carbonate content. Therefore, the permeability reduction also is smaller using this method. The proposed method can be used for applications which require only an increase in strength, such as for granular base for pavement or the toe drainage of a slope.
    publisherASCE
    titleBiogrouting Method for Stronger Bond Strength for Aggregates
    typeJournal Paper
    journal volume146
    journal issue11
    journal titleJournal of Geotechnical and Geoenvironmental Engineering
    identifier doi10.1061/(ASCE)GT.1943-5606.0002386
    page1
    treeJournal of Geotechnical and Geoenvironmental Engineering:;2020:;Volume ( 146 ):;issue: 011
    contenttypeFulltext
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