Abstract
Calcite-induced precipitation methods (CIPMs) have recently become potential techniques in geotechnical engineering for improving the shear strength of sandy soil. One of the most promising methods among them is enzyme-induced calcite precipitation (EICP). In this technique, a mixed solution composed of reagents and the urease enzyme, which produces calcite, is utilized as the grouting material. The precipitated calcite in granular soil provides ties among the grains of soil and limits their mobility, thus promoting an improvement in strength and stiffness and also a reduction in the hydraulic conductivity of sandy soil. This paper discusses the potential increase in the strength and stiffness of the soil, the additional materials for grouting, the effect of these materials on the treatment process, and the engineering properties of the soil. The possible sources of the urease enzyme and the applicability of the EICP method to other soil types are also discussed in this paper. The environmental and economic impacts of the application of EICP are also presented. The envisioned plans for application, potential advantages, and limitations of EICP for soil stabilization are discussed. Finally, the primary challenges and opportunities for development in future research are briefly addressed.
Highlights
Numerous feasible methods have recently been developed for various purposes related to ground improvement, such as soil densification, the utilization of synthetic materials [1,2,3], grouting or the deep-mixing method [4,5], and stone columns [4,6]
These results showed that the application of the calcite precipitation method to organic soil is less effective compared to its application to sandy soil
This paper has presented a review of a recently proposed potential technique in geotechnical engineering for improving the engineering properties of sandy soil using enzyme-induced calcite precipitation (EICP)
Summary
Numerous feasible methods have recently been developed for various purposes related to ground improvement, such as soil densification, the utilization of synthetic materials [1,2,3], grouting or the deep-mixing method [4,5], and stone columns [4,6]. A variety of materials can be applied for chemical grouting, including cement, lime, or other gel-like materials, depending upon the purpose of the stabilization [6,7,8,9] In this technique, the compound solution is injected into the soil. One of the advancing potential methods uses a type of bio-grout and is called the calcite-induced precipitation method (CIPM) [10,12,13,14,15,16,17,18,19,20,21] It has been studied extensively as a possible ground-improvement method. It can enhance the strength and stiffness of the soil [12,19,21,22] and reduce the permeability [13,14,15,16,23]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
