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Full-Text Articles in Engineering
Evaluating The Effectiveness Of Soil-Native Bacteria In Precipitating Calcite To Stabilize Expansive Soils, Bhaskar C. S. Chittoori, Malcolm Burbank, Md Touhidul Islam
Evaluating The Effectiveness Of Soil-Native Bacteria In Precipitating Calcite To Stabilize Expansive Soils, Bhaskar C. S. Chittoori, Malcolm Burbank, Md Touhidul Islam
Civil Engineering Faculty Publications and Presentations
The use of chemical additives to stabilize expansive soils is a common practice. However, the environmental concerns associated with the greenhouse gas generation during the production of these chemicals have launched engineers in search of sustainable stabilization alternatives. Microbial induced calcite precipitation (MICP) is a bio-cementation technique that could be a potential solution to this problem. Typically, MICP is achieved via bio-augmentation; however, bio-stimulation was argued to be a more realistic alternative due to its field implementation potential. Hence, in this research study, two expansive soils with varying plasticity characteristics were examined to understand the potential of MICP in treating …
Evaluating The Application Of Microbial Induced Calcite Precipitation Technique To Stabilize Expansive Soils, Bhaskar Chittoori, Sikha Neupane
Evaluating The Application Of Microbial Induced Calcite Precipitation Technique To Stabilize Expansive Soils, Bhaskar Chittoori, Sikha Neupane
Civil Engineering Faculty Publications and Presentations
Expansive soils, also known as swell-shrink soils have been a problem for civil infrastructures including roads and foundations from ancient times. The use of chemical additives such as cement and lime to stabilize expansive soils is a common practice among geotechnical engineers, especially for lightly loaded structures. However, several occurrences of subgrade failures have been observed after stabilizing with chemical additives. Hence, engineers are in search of sustainable stabilization alternatives. Microbial Induced Calcite Precipitation (MICP) is gaining attention as an environmentally friendly soil improvement technique. Several researchers have successfully tested its feasibility in mitigating liquefaction-induced problems in sandy soils. In …
Addressing Clay Mineralogy Effects On Performance Of Chemically Stabilized Expansive Soils Subjected To Seasonal Wetting And Drying, Bhaskar C.S. Chittoori, Anand J. Puppala, Aravind Pedarla
Addressing Clay Mineralogy Effects On Performance Of Chemically Stabilized Expansive Soils Subjected To Seasonal Wetting And Drying, Bhaskar C.S. Chittoori, Anand J. Puppala, Aravind Pedarla
Civil Engineering Faculty Publications and Presentations
Premature failures in chemically stabilized expansive soils cause millions of dollars in maintenance and repair costs. One of the reasons for these failures is the inability of existing stabilization design guidelines to consider the complex interactions between clay minerals and the stabilizers. It is vital to understand these complex interactions, as they are responsible for the strength improvement and swell/shrink reduction in these soils, in turn affecting the overall health of the infrastructure. Hence, this research study examined the longevity of chemically stabilized expansive soils subjected to wetting/drying conditions with a major focus on clay mineralogy. Eight different natural soils …