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Mineralogy of Calcium Carbonate in MICP-Treated Soil Using Soaking and Injection Treatment Methods

机译：MICP处理过的土壤中碳酸钙的浸泡和注射处理矿物学

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摘要

Treatment method can have a significant influence on the mineralogy of the precipitated calcium carbonate (CaCO_3) in soil treated by microbially-induced carbonate precipitation (MICP). Rhombohedral calcite crystals are the most desirable form of CaCO_3 for geotechnical applications due to their thermodynamically stable nature. However, not all treatment methods produce this form of CaCO_3. Soaking and injection are two methods for MICP treatment of soil commonly used in the laboratory. The injection method was found to be more efficient for obtaining rhombohedral calcite crystals. It appears that rhombohedral calcite crystal growth is hindered in the soaking treatment method due to high concentration of organic matter in the treatment solution. These results indicate that mineralogical considerations should be included when determining an appropriate method for MICP-treatment of soil in the laboratory such that the resulting specimen is representative of the in situ mechanical behavior of MICP-treated soil.
机译：处理方法可能会对通过微生物诱导的碳酸盐沉淀（MICP）处理的土壤中沉淀的碳酸钙（CaCO_3）的矿物学产生重大影响。菱形方解石晶体由于其热力学稳定的性质，是岩土工程应用中最理想的CaCO_3形式。但是，并非所有的处理方法都产生这种形式的CaCO_3。浸泡和注射是实验室中常用的MICP处理土壤的两种方法。发现注射方法对于获得菱形方解石晶体更有效。似乎由于处理溶液中有机物的浓度高，在浸泡处理方法中菱形方解石晶体的生长受到了阻碍。这些结果表明，在实验室中确定适当的土壤MICP处理方法时，应考虑矿物学因素，以使所得标本代表MICP处理过的土壤的原位力学行为。

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