Journal ArticleDOI
Strengthening of Soft Marine Clay Using Bioencapsulation
TLDR
In this article, a bioencapsulation method was used to increase the unconfined compressive strength of marine clay aggregates with a size of 5mm from almost zero to more than 2MPa.Abstract:
Dredged or excavated soft marine clay can be improved by mixing it with cement or lime. However, these treatments are usually expensive. It is shown in this paper that soft marine clay can be strengthened through a bioencapsulation method in which the shear strength of clay aggregates can be substantially increased after the aggregates are treated with urease-producing bacteria, calcium chloride, and urea. We found that the bioencapsulation had increased the unconfined compressive strength of marine clay aggregates with a size of 5 mm from almost zero to more than 2 MPa. The strength of the bioencapsulated clay aggregates decreases with the increase in the size of the aggregate when the size is greater than 5 mm.read more
Citations
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State-of-the-Art Review of Biocementation by Microbially Induced Calcite Precipitation (MICP) for Soil Stabilization
TL;DR: A review of the use of MICP for soil improvement can be found in this article, where the authors discuss the treatment process including the primary components involved and major affecting factors, as well as the potential advantages and limitations.
Journal ArticleDOI
Influence of cementation level on the strength behaviour of bio-cemented sand
TL;DR: In this article, the strength of bio-cemented sand with varying cementation levels was evaluated by isotropic consolidated undrained compression tests, calcite mass measurement and scanning electron microscopy tests.
Journal ArticleDOI
Effect of relative density and biocementation on cyclic response of calcareous sand
TL;DR: Microbial-induced calcium carbonate precipitation (MICP) as mentioned in this paper represents a promising approach to improve the geotechnical engineering properties of soils through the precipitation of calcium carbonates (CAR).
Journal ArticleDOI
Microbially induced calcium carbonate precipitation: a widespread phenomenon in the biological world
Mostafa Seifan,Aydin Berenjian +1 more
TL;DR: The detailed metabolic pathways, including ammonification of amino acids, dissimilatory reduction of nitrate, and urea degradation (ureolysis), along with the potent bacteria and the favorable conditions for precipitation of calcium carbonate, are explained.
Journal ArticleDOI
Improving the strength of weak soil using polyurethane grouts: A review
TL;DR: In this paper, a literature review and collecting information on the application of polyurethane chemical grout for improving the properties of weak soils has been conducted and the review concluded that improved polyurethsane has the potential to improve weak soil types for infrastructure development.
References
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Journal ArticleDOI
Microbial Carbonate Precipitation as a Soil Improvement Technique
TL;DR: In this article, a five meter sand column was treated with bacteria and reagents under conditions that were realistic for field applications, and the column was subjected to mechanical testing, which indicated a significant improvement of strength and stiffness over several meters.
Journal ArticleDOI
Carbon dioxide emissions from the global cement industry
TL;DR: In this paper, the authors reviewed the total CO2 emissions from cement making, including process and energy-related emissions, and discussed CO2 emission mitigation options for the cement industry.
Journal ArticleDOI
Bio-mediated soil improvement
TL;DR: In this article, the authors present an overview of bio-mediated improvement systems, identifying the primary components and interplay between different disciplines and identifying the geometric compatibility between soil and microbes that restricts the utility of different systems.
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Microbial carbonate precipitation in construction materials: A review
TL;DR: In this paper, the use of microbially induced carbonates as a binder material, i.e., biocementation, is discussed, for the improvement of compressive strength and the remediation of cracks.
Journal ArticleDOI
Applications of microorganisms to geotechnical engineering for bioclogging and biocementation of soil in situ
Volodymyr Ivanov,Jian Chu +1 more
TL;DR: The aim of these applications is to improve the mechanical properties of soil so that it will be more suitable for construction or environmental purposes, and two notable applications, bioclogging and biocementation, have been explored.