@inproceedings{abce40eef3e2414da8d6447d6c48ed9c,
title = "Direct shear strength of biologically cemented gravel",
abstract = "Biogrouting is a new potentially sustainable ground improvement method. The process of biogrouting involves carbonate precipitation induced by microorganisms (MICP) e.g. by hydrolysis of urea. In the summer of 2010, biogrouting was applied for the first time in practice to reduce the risk of borehole collapse during horizontal directional drilling in gravel layers. Within this project several gravel columns were treated in the laboratory in order to evaluate the potential of MICP to strengthen gravel and to determine the minimum required amount of cement to prevent borehole collapse. Although it proved to be difficult to produce homogeneously cemented gravel columns a correlation was established between the amount of calcium carbonate and the direct shear strength for different loading conditions.",
author = "{Van Paassen}, {L. A.} and {Van Hemert}, {W. J.} and {Van Der Star}, {W. R.L.} and {Van Zwieten}, G. and {Van Baalen}, L.",
year = "2012",
doi = "10.1061/9780784412121.100",
language = "English (US)",
isbn = "9780784412121",
series = "Geotechnical Special Publication",
number = "225 GSP",
pages = "968--977",
booktitle = "GeoCongress 2012",
edition = "225 GSP",
note = "GeoCongress 2012: State of the Art and Practice in Geotechnical Engineering ; Conference date: 25-03-2012 Through 29-03-2012",
}