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Study on Strength and Leaching Behavior of Biogeochemical Cemented Sand
Geomicrobiology Journal ( IF 2.3 ) Pub Date : 2020-05-12 , DOI: 10.1080/01490451.2020.1761912
Vineeth Reddy Karnati 1 , Teja Munaga 2 , Kalyan Kumar Gonavaram 2 , Bandhu Amitava 3
Affiliation  

Abstract Conventional ground improvement techniques involve densification of soil either by mechanical compaction or chemical grouting while others involve inclusion of reinforcements, etc. Many conventional grout materials were found posing a threat to environment due to their toxic nature and release of greenhouse gases. In this regard, research is initiated in developing more environmentally sustainable additives for soil improvement in which biological based alternatives are gaining momentum. In the present study, a noble technique Microbial Induced Calcite Precipitation (MICP) using Sporosarcina pasteurii was adopted to modify the properties of sand and improve its efficiency by supplementing with Cellulomonas flavigena. The mineralogy of treated specimens was studied using X-Ray Diffraction and Scanning Electron Microscope analyses. The leachability of precipitated calcite was studied under constant flowing conditions and the material was found to be stable. The Unconfined Compressive Strength (UCS) and elastic modulii of the treated specimens were found to be in the range of 266–343 kPa and 14–35 MPa respectively. The angle of internal friction found from Direct Shear Test on treated specimens was observed to be a little lower compared to virgin specimens. The permeability of treated specimen showed a reduction in magnitude by one order approximately.

中文翻译:

生物地球化学胶结砂强度及浸出行为研究

摘要 传统的地面改良技术涉及通过机械压实或化学灌浆使土壤致密化,而其他技术则涉及加入加固物等。发现许多传统灌浆材料由于其有毒性质和温室气体释放而对环境构成威胁。在这方面,开始研究开发更具环境可持续性的土壤改良添加剂,其中生物替代品正在获得动力。在本研究中,采用使用巴斯德氏孢子菌的微生物诱导方解石沉淀 (MICP) 的高贵技术通过补充纤维单胞菌来改变沙子的性质并提高其效率。使用 X 射线衍射和扫描电子显微镜分析来研究处理过的样品的矿物学。在恒定流动条件下研究了沉淀方解石的浸出性,发现该材料是稳定的。发现处理过的试样的无侧限压缩强度 (UCS) 和弹性模量分别在 266-343 kPa 和 14-35 MPa 的范围内。观察到从处理过的样品的直接剪切试验中发现的内摩擦角与原始样品相比略低。处理过的样本的渗透率显示出大约一个数量级的减少。观察到从处理过的样品的直接剪切试验中发现的内摩擦角与原始样品相比略低。处理过的样本的渗透率显示出大约一个数量级的减少。观察到从处理过的样品的直接剪切试验中发现的内摩擦角与原始样品相比略低。处理过的样本的渗透率显示出大约一个数量级的减少。
更新日期:2020-05-12
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