CORE
🇺🇦
make metadata, not war
Services
Services overview
Explore all CORE services
Access to raw data
API
Dataset
FastSync
Content discovery
Recommender
Discovery
OAI identifiers
OAI Resolver
Managing content
Dashboard
Bespoke contracts
Consultancy services
Support us
Support us
Membership
Sponsorship
Community governance
Advisory Board
Board of supporters
Research network
About
About us
Our mission
Team
Blog
FAQs
Contact us
Effect of carbonate precipitating bacteria on strength and hydraulic characteristics of loess soil
Authors
S. Atashgahi
S.S. Hosseini
A. Shahryari
A. Tabarsa
Publication date
1 January 2020
Publisher
'Springer Fachmedien Wiesbaden GmbH'
Abstract
Microbial-induced calcite precipitation (MICP) is one of the environmentally friendly techniques that has recently become popular amongst geotechnical engineers. Two bacterial species of Bacillus family, i.e., B. pasteurii and B. megaterium have been used to improve the loess soil properties. A set of unconfined compressive, permeability, ultrasonic, and collapse potential tests have been applied to assess the characteristics of natural soil compared to those of MICP-treated ones. The effects of curing time (1, 3, and 7 days), bacterial optical density (OD = 0.5, 1, and 1.5), and soil density (13, 14, and 15 kNm3) have been investigated. Results indicate that biological enhancement has improved the engineering properties of the loess soil. MICP-treated soil using B. megaterium provides higher strength improvement ratios (1.15�4.4 times) rather than B. pasteurii-treated samples (1.05�3.4 times). Correspondingly, specimens containing B. megaterium have greater permeability reduction ratios (3.9�93.7) compared with those of B. pasteurii ones (2�95). Moreover, scanning electron microscope (SEM) analysis has been employed to confirm the findings. It is worth noting that various bacteria concentrations, curing periods, and soil densities can affect the stress-strain curve considerably. The results indicated that MICP reduced the collapse potential between 24 and 54.8 and increased the longitudinal wave velocity between 1.1 and 2.4 times more than the untreated soil. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature
Similar works
Full text
Available Versions
Golestan University of Medical Sciences Repository
See this paper in CORE
Go to the repository landing page
Download from data provider
oai:eprints.goums.ac.ir:10667
Last time updated on 23/06/2020