Microbially/CO2-derived CaCO3 cement strengthens calcareous sands and its cementation mechanism View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2022-07-09

AUTHORS

Xiaoniu Yu, Haoqing Yang, Qiwei Zhan

ABSTRACT

In this text, a method to use CO2 for the treatment of calcareous sand is presented. Carbon dioxide solidification-bacteria (Streptomyces microflavus) was obtained by screening and applied to the mechanical strengthening of calcareous sand through a microbial mineralization/carbonization process. Experiments in both liquid phase and sand were carried out. The optimal mass ratio of carbon dioxide solidification-bass cteria to calcium oxide was found to be 2:1. The optimal dosage of bacterial powder was 30% of the total dry sand mass. Using the optimal recipe, the average uniaxial compressive strength of treated sand columns was 3.67 MPa and the average permeability coefficient was 4.90 × 10−3 cm/s. Compared to the other microbial induced carbonate precipitation (MICP) approaches, the proposed method does not release harmful by-products such as ammonia. The chemical composition and microstructure of the treated calcareous sand were characterized by powder X-ray diffraction (XRD) and scanning electron microscopy (SEM). The XRD results showed that the CO2 carbonized product contained mainly calcite.Graphical abstract More... »

PAGES

2773-2785

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s10098-022-02352-8

DOI

http://dx.doi.org/10.1007/s10098-022-02352-8

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1149335952


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