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Ecofriendly calcium phosphate and calcium bicarbonate biogrouts

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Title: Ecofriendly calcium phosphate and calcium bicarbonate biogrouts
Authors: Ivanov, Volodymyr Browse this author
Stabnikov, Viktor Browse this author
Kawasaki, Satoru Browse this author →KAKEN DB
Keywords: Biogrout
Soil stabilization
Fractured rocks sealing
Calcium bicarbonate
Calcium phosphate
Issue Date: 1-May-2019
Publisher: Elsevier
Journal Title: Journal of cleaner production
Volume: 218
Start Page: 328
End Page: 334
Publisher DOI: 10.1016/j.jclepro.2019.01.315
Abstract: An important direction of construction biotechnology is production and application of the biogrouts to decrease the hydraulic conductivity of soil or fractured rocks. The most popular biogrout is a mixture of calcium chloride, urea, and either ureolytic bacteria or enzyme urease. A disadvantage of this biogrout is the release of a large quantity of toxic ammonia to air, as well as harmful ammonium and hydroxide ions to water. The aim of this study was evaluation of two new biogrouts that release less of harmful by-products to environment. First biogrout was a mixture of acidified hydroxyapatite solution from the bone powder with an addition of two times less urea that is used in conventional biogrout. Final pH was 7. Second biogrout was a solution of calcium bicarbonate produced from chalk powder and carbon dioxide with an addition of urea and acidotolerant ureolytic bacteria. This biogrout released to environment four times less ammonium and ammonia than conventional biogrout. Final pH was 8. Precipitation of about 2 g of calcium carbonate per kg of the cracked stone diminished the water seepage through the specimen by three orders of magnitude. Geotechnical or environmental engineering applications of these environmentally friendly biogrouts are limited by the consumption of a large volume of the grouting solution. It is due to low concentration of dissolved calcium, about 200-400 g m(-3) , in these liquid biogrouts. So, these biogrouts could be most effective for the sealing and strengthening of the materials with low porosity such as the fractured rocks or cracked concrete.
Rights: © <2019>. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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