Center for Academic Enrichment and Outreach

Document Type


Publication Date

Fall 9-21-2019


University of Nevada, Las Vegas

Publisher Location

Las Vegas (Nev.)


The aim of this study was to present a possibility for the use of biocementon expansive clay. Expansive soil is a type of clay when exposed to water and moisture changes its volume. Due to the clays swelling and shrinkage behavior itsdifficult to use it in engineering and construction projects, therefore costly and unhealthy techniques have been used to stabiliseexpansive soil in order to address the problem [12]. A possible healthy and environmentally friendly solution is Biocement which uses microbial induced calcite precipitation (MICP) in order to help aggregate soil to form a stable cementitiousmaterial. MICP isdependent on the innate process of urea production in Microorganisms that utilizes the production of urea to form carbonate through the process of hydrolysis speed up by the urease enzyme [3]. The use of biocementationis being applied to many fields such as construction and erosion control [9]. However, there are many other processes that can utilize this technology for its benefit. In this review, we used a systematic method and set parameters to find literatures where we could analyze if biocementwould work onexpansive clay and ifwe could narrow to an organism that would work best for future experiment. We ended up with 13 publicationwhich we summarized in table 1. We looked at the publications the type of organisms they used, the type of soil they, permeability, porosity, strength, optimal temperature, optimal pH, and cell concentration. We concluded that biocementation could be used with expansive clay and that it would be able to improve its permeability to water and improve its strength. We also concluded that Sporosarcina pasteurii was the optimal organism to use. However, there was limited publication on thetopic therefore further studies need to be conducted.


Systematic literature review; Expansive soil; Biocement; Calcite precipitation


Chemistry | Earth Sciences | Life Sciences

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1.141 KB




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