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Soil bio-cementation using an improved 2-step injection method
Ist Teil von
Arabian journal of geosciences, 2020-12, Vol.13 (23), Article 1270
Ort / Verlag
Cham: Springer International Publishing
Erscheinungsjahr
2020
Link zum Volltext
Quelle
Springer LINK 全文期刊数据库
Beschreibungen/Notizen
To improve the uniformity of calcium carbonate distribution in soil treated by microbially induced carbonate precipitation (MICP), an improved biological injection method, namely “2-step method”, was proposed. This method was achieved by first injecting a certain volume of pure bacterial suspension into soil, followed by injecting the remaining pore volume with the mixed bacterial suspension, which was prepared by mixing pure bacterial suspension and fixation solution containing CaCl
2
. The method was validated through various physical and mechanical properties of the bio-cemented sand, including the bacterial adsorption efficiency, calcium carbonate content and distribution, and unconfined compressive strength. The results showed that the proposed 2-step method could effectively improve the bacterial adsorption, calcium carbonate content, and strength of bio-cemented sand. The prepared bio-cemented sand had relatively uniform distribution of calcium carbonate and higher strength. The optimal volume ratio between the mixed bacterial suspension and pure bacterial suspension for the 2-step method was 0.6:0.4.