水泥基材料中微生物矿化机理及理论模型研究

发布时间：2018-06-14 06:37

本文选题：水泥基材料 + 微生物　；参考：《混凝土》2017年09期

【摘要】：采用菌液浸泡法,研究了微生物矿化对水泥基材料的防护增强作用,分析了营养成分对微生物生长及矿化行为的影响,并结合微观测试结果,探讨了水泥基材料中微生物的矿化机理。结果表明,菌液浸泡后水泥试件强度显著提高,其中硫铝酸盐水泥基体与微生物矿化的适应性更好。水泥基材料中微生物的矿化遵循矿物成核作用的物理化学规律,硫铝酸盐水泥基体中,大量白色棱形颗粒状和花瓣状方解石型碳酸钙依附于水泥石基面定向排列生长;硅酸盐水泥基体中的方解石型碳酸钙呈团簇状覆盖于水泥石基面。菌液营养成分会影响微生物的矿化效率,当菌液中尿素浓度≤10 g/L时,随浓度的增大,微生物矿化强度提高;当钙离子浓度为2 mmol/L时,微生物的矿化强度最大。
[Abstract]:The effect of microbial mineralization on the protection and enhancement of cement based materials was studied by the soaking method of bacteria solution. The effects of nutrients on the growth and mineralization behavior of microorganism were analyzed, and the results of microcosmic test were combined. The mineralization mechanism of microorganisms in cement based materials was discussed. The results showed that the strength of cement specimens was significantly increased after soaking in bacteria solution, and the adaptability of sulphoaluminate cement matrix to microbial mineralization was better. The mineralization of microorganism in cement-based materials follows the physicochemical law of mineral nucleation. In the sulphoaluminate cement matrix, a large number of white prismatic granular and petal calcite calcium carbonate grow on the cement base surface. Calcite calcium carbonate in Portland cement matrix is covered on cement base surface in cluster form. When the concentration of urea in the solution was less than 10 g / L, the mineralization intensity of the microorganism increased with the increase of the concentration, and the mineralization intensity of the microorganism was the highest when the concentration of calcium ion was 2 mmol / L.
【作者单位】：三峡大学土木与建筑学院;
【基金】：国家自然科学基金(51109122) 湖北省教育厅科学研究计划项目(D20141204)
【分类号】：TU528

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