Article
Engineering, Geological
Hao Zeng, Li-Yang Yin, Chao-Sheng Tang, Cheng Zhu, Qing Cheng, Hao Li, Chao Lv, Bin Shi
Summary: The combination of fiber reinforcement and bio-cementation based on microbially induced carbonate precipitation (MICP) can enhance the tensile behavior and structural integrity of calcareous sands. Fibers increase sand ductility, but excessive fibers may negatively impact sand tensile strength.
ENGINEERING GEOLOGY
(2021)
Article
Construction & Building Technology
Qian Zhang, Weimin Ye, Zhangrong Liu, Qiong Wang, Yonggui Chen
Summary: Calcareous sands, widely distributed in tropical oceans, need to be treated to improve their engineering properties before being used in construction. In this study, the EICP technique was used to cement calcareous sands using urease extracted from soybean powder. Different injection methods and rates were tested, and the effects on hydraulic conductivity, shear wave velocity, and compressive strength were evaluated. Results showed that a high injection rate improved cementation uniformity and mechanical strengths.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Ocean
Jiaming Zhang, Yuhao Li, Yi Luo, Yanjun Li, Qinggang Yang, Zijian Shen
Summary: This study investigates the feasibility of using reactive magnesium cement (RMC) for bio-carbonation to mitigate coastal erosion through laboratory-scale wave erosion tests. Results show that bio-carbonation treatment improves erosion resistance of sand dunes, and the effectiveness increases with thicker cement or higher RMC content.
MARINE GEORESOURCES & GEOTECHNOLOGY
(2022)
Article
Engineering, Marine
Ziyu Wang, Xiangyu Zhao, Xin Chen, Peng Cao, Liang Cao, Wenjing Chen
Summary: The use of microbial induced calcium carbonate precipitation (MICP) technology is proposed to improve the mechanical properties of calcareous sand. Solidification tests were conducted in natural seawater and freshwater environments, and shear tests were performed on calcareous sand and solids under varying reinforcement conditions. The composite power-exponential (CPE) model is introduced to describe the stress-strain relationship of the solid, and a method for determining model parameters is presented. The experimental results showed that the strength of calcareous sand with solids increased with the increase in number of reinforcement times for both test environments.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Chemistry, Physical
Md Al Imran, Kazunori Nakashima, Niki Evelpidou, Satoru Kawasaki
Summary: This study investigated the durability of jute-reinforced MICP-treated samples under exposure to DW and ASW, showing that the addition of fiber (jute) improved the durability by more than 50%. The wet-dry cyclic process had adverse effects on the mechanical and physical characteristics of the samples in both environments, with calcium carbonate breakdown and bonding effects contributing to deterioration.
Article
Engineering, Geological
Monika Dagliya, Neelima Satyam, Meghna Sharma, Ankit Garg
Summary: Wind erosion is a significant natural calamity worldwide. This study evaluates the feasibility of using microbially induced calcium carbonate precipitation to mitigate wind-induced erosion in the Thar desert of India. The results show that the biocemented sand samples are more resistant to erosion compared to untreated sand, and longer treatment duration leads to thicker crust and higher surface strength.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2022)
Article
Engineering, Geological
Hai-Lei Kou, Jia-Hui Liu, Peng Zhang, Chuangzhou Wu, Pengpeng Ni, Dong Wang
Summary: The study utilized recycled shredded coconut coir (RSC) to enhance the erosion resistance of treated calcareous sandy slopes, showing that the addition of RSC can promote MICP treatment and reduce treatment cycles. Penetration testing can be used to evaluate the erosion resistance of bio-cemented slopes, showing a nonlinear relationship with erosion resistance.
Article
Energy & Fuels
Ahmed Miftah, Hamed Khodadadi Tirkolaei, Huriye Bilsel, Hany El Naggar
Summary: The main objective of this study was to evaluate the effectiveness of enzymatic induced carbonate precipitation (EICP) treatment for improving erodibility, mitigating scour, and enhancing water infiltration capacity of beach sand. The results demonstrated that EICP treatment significantly improved the erodibility behavior and shear strength of the soil, leading to reduced erosion rates and scour depths.
GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT
(2022)
Article
Engineering, Ocean
Hai-lei Kou, Zhen-dong Li, Jia-hui Liu, Zhao-tun An
Summary: The effects of initial relative density and microbially induced carbonate precipitation (MICP) treatment on calcareous sand samples with different recycled shredded coconut coir (RSC) content were investigated. The calcium carbonate content of the cemented samples was related to the relative density of the sand and not significantly related to the RSC content. The maximum shear modulus and permeability coefficient of the samples were influenced by the MICP treatment and calcium carbonate content, while the addition of RSC improved the brittle failure characteristics of the treated samples.
APPLIED OCEAN RESEARCH
(2023)
Article
Engineering, Geological
Guoliang Ma, Yang Xiao, Xiang He, Jun Li, Jian Chu, Hanlong Liu
Summary: Ocean development is an effective solution to resource issues, and using kaolin-based biocement to stabilize calcareous sand can improve cost-performance and increase saturated strength. The distribution of precipitate contents and a critical permeability range have also been determined, providing valuable insights for ocean engineering.
Article
Chemistry, Multidisciplinary
Yanjun Li, Jianwen Chen
Summary: In the construction of artificial islands, the use of calcareous sand as a filler presents challenges in terms of water permeability. This research investigates the effect of grain gradation on the permeability of calcareous sand treated with microbial-induced carbonate precipitation (MICP). The results show that grain gradation significantly influences the permeability improvement achieved through MICP treatment.
APPLIED SCIENCES-BASEL
(2022)
Article
Environmental Sciences
S. Ghadr, A. Assadi-Langroudi, C. Hung
Summary: Salt lakes are important sources of dust, and efforts to reduce dust efflux often involve chemical stabilization with conventional additives. However, this can disrupt soil biogeochemical cycles. This research explores the use of ground rubber and colloidal nanosilica to create a thin, porous crust on calcareous lake sand, which shows promising strength and post-peak response.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2022)
Article
Biotechnology & Applied Microbiology
Lin Wang, Wen-Chieh Cheng, Zhong-Fei Xue, Md Mizanur Rahman, Yi-Xin Xie, Wenle Hu
Summary: Inappropriate irrigation can lead to migration of heavy metals into surrounding environments, posing a serious threat to the human central nervous system. Microbial-induced carbonate precipitation (MICP) and enzyme-induced carbonate precipitate (EICP) have been proposed as alternatives to traditional site remediation technologies. This study compared the remediation performance of lead (Pb) and copper (Cu) using MICP and EICP respectively, and investigated the factors affecting the remediation efficiency. Results showed that MICP had higher ammonium ion (NH4 (+)) concentration than EICP, and the remediation efficiency against Cu2+ was approximately zero. The reduction in remediation efficiency against Pb2+ and Cu2+ was attributed to the precipitations of cotunnite and atacamite respectively.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2023)
Article
Engineering, Ocean
Zhaoyu Wang, Nan Zhang, Yong Jin, Qi Li, Junhao Xu
Summary: The study applied the MICP technique to sand embankments for scouring/erosion control in coastal areas of China, showing a significant improvement in anti-scouring/erosion performance. Experimental results indicated an increase in CaCO3 content in treated embankments and enhanced bonding strength due to MICP-induced CaCO3 formed at sand grain contact points. Further research on environmental factors and field implementation is needed.
MARINE GEORESOURCES & GEOTECHNOLOGY
(2021)
Article
Construction & Building Technology
Yujie Li, Zhen Guo, Lizhong Wang, Zhe Ye, Chaofeng Shen, Wenjie Zhou
Summary: This paper investigates the influence of Microbial-induced carbonate precipitation (MICP) on the interface strength and shear behavior between calcareous sand and steel. It was found that increasing CaCO3 content enhances peak shear strength, but also leads to significant volume dilation and reduced shear band thickness. With increasing normal stress, the shear band thickness changes, and MICP products alter the interface morphology.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Review
Engineering, Geological
Chao-Sheng Tang, Qing Cheng, Xuepeng Gong, Bin Shi, Hilary I. Inyang
Summary: Variability in moisture content significantly influences soil properties. Understanding the soil microstructure evolution during wetting/drying process is crucial for interpreting soil macro hydro-mechanical behavior. This review summarizes commonly used methods and research progress in studying soil microstructure, and proposes important research areas for future work.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2023)
Article
Engineering, Geological
Xiaole Han, Ningjun Jiang, Fei Jin, Krishna R. Reddy, Yijie Wang, Kaiwei Liu, Yanjun Du
Summary: A novel alkali activation-based sustainable binder was developed to improve the geomechanical performance of coral sand in coastal areas. Adding biochar in the binder improved soil strength, elastic modulus, and water holding capacity, but had a marginal effect on sulfate resistance and slightly deteriorated wet-dry cycle performance.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2023)
Article
Engineering, Geological
Yijie Wang, Ningjun Jiang, Alexandra Clara Saracho, Ogul Doygun, Yanjun Du, Xiaole Han
Summary: This study focuses on the bio-stimulated microbial-induced calcium carbonate precipitation (MICP) approach. Through one-dimensional compression tests, it is found that bio-cemented sand with higher initial relative density and higher cementation content has better compressibility.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2023)
Article
Engineering, Geological
Rui Wang, Chao-Sheng Tang, Xiao-Hua Pan, Dian-Long Wang, Zhi-Hao Dong, Bin Shi
Summary: The bio-carbonation method using reactive magnesia cement (RMC) was proven to be effective for stabilizing dredged sludge with high initial water content. The stabilization performance was influenced by curing agent components, bacteria concentration, and urea content. The combination of brucite and bio-carbonation products of RMC played a significant role in improving the physico-mechanical properties of the dredged sludge.
Article
Environmental Sciences
Xiao-Le Han, Ning-Jun Jiang, Toshiro Hata, Jongseong Choi, Yan-Jun Du, Yi-Jie Wang
Summary: A deep learning-based Mask R-CNN algorithm was developed in this study for accurate localization, classification, and segmentation of various shapes of large marine microplastic particles. The algorithm showed high precision, recall, and F1 score on a test dataset of 250 images. The results suggest that Mask R-CNN algorithm is a promising method for microplastic characterization in large-scale surveys.
MARINE ENVIRONMENTAL RESEARCH
(2023)
Article
Chemistry, Analytical
Bo Li, Ningjun Jiang, Xiaole Han
Summary: This study proposes a method to denoise Brillouin gain spectrum (BGS) images using a convolutional neural network (CNN), enhancing the performance of the BOTDR system. By reducing the noise of the BGS images along the length of the fibre under test with different network depths and epoch numbers, smaller frequency uncertainties and higher strain vibration detection results are obtained.
Article
Engineering, Geological
Yi-Jie Wang, Ning-Jun Jiang, Xiao-Le Han, Yan-Jun Du
Summary: The study investigates the effect of biochar amendment on the shear strength of biocemented calcareous sand through the biostimulation approach. The results show that the amendment of biochar can increase the overall cementitious content of the biocemented sand. The shear strength enhancement provided by biochar depends on the biochar content, cementitious content, and initial relative density.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2023)
Article
Engineering, Geological
Arif Mohammad, Evan K. Paleologos, Pawel Ogrodnik, Eugeniusz Koda, Piotr Osinski, Anna Podlasek, Magdalena Daria Vaverkova, Venkata Siva Naga Sai Goli, Prithvendra Singh, Kai Wang, Xiao - Hui Chen, Aizhong Ding, Ning-Jun Jiang, Yi-Jie Wang, Devendra Narain Singh
Summary: Surface and sub-surface fires in landfills are complex and expected to increase due to climate change. These fires result in the creation of toxic compounds that pose severe health hazards to living entities. Understanding the occurrence mechanisms, waste properties, and detection techniques is crucial for early detection and emergency planning. This review critically assimilates the literature on landfill fires, discussing conditions for initiation and sustenance, short- and long-term hazards, and early warning system techniques.
ENVIRONMENTAL GEOTECHNICS
(2023)
Article
Construction & Building Technology
Xian-Lei Fu, Heng Zhuang, Krishna R. Reddy, Ning-Jun Jiang, Yan-Jun Du
Summary: This study developed a novel composite polymer-amended bentonite for environmental containment applications. Laboratory experiments were conducted to evaluate the properties of the polymer-amended bentonite, including free swell index, liquid limit, hydraulic conductivity, rheological properties, and polymer stability. The results showed that the polymer-amended bentonite with a PAC-HPMC mass ratio of 7 had the lowest hydraulic conductivity and stronger hydrogen bonding strength. The yield stress of the polymer-amended bentonite was found to be a good indicator for evaluating polymer stability and the effectiveness of the engineered barrier material.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Environmental Sciences
Junde Qin, Yunhui Zhang, Yaolin Yi
Summary: This study investigated the effects of water washing and acid washing on gasification fly ash. The results showed that different re-precipitates could be identified in washed GFAs depending on different pH conditions. Low-concentration acid washing reduced heavy metal leachabilities, while high-concentration acid washing effectively extracted Zn and Cd. Applying 1.2 M-HCl washing for 15 minutes achieved a Pb extraction ratio of 81.2%.
ENVIRONMENTAL POLLUTION
(2023)
Article
Engineering, Environmental
Jun-Zheng Zhang, Chao-Sheng Tang, Cheng Zhu, Qi-You Zhou, Jin-Jian Xu, Bin Shi
Summary: This study presents a novel ERT-based method to characterize and quantify clayey soil desiccation cracking. The results show that ERT can effectively capture and image the cracking process, and the estimated cracking depths using ERT are consistent with experimental observation.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2023)
Article
Computer Science, Interdisciplinary Applications
Zhao-Jun Zeng, Chao-Sheng Tang, Qing Cheng, Ni An, Xiao-Ying Chen, Bin Shi
Summary: In this study, a new numerical approach is proposed to simulate water evaporation in cracked soils, which divides the cracked soil into soil and air domains and determines the boundary conditions using vapor flux. Numerical tests show that air humidity and segmentation method affect the soil evaporation rate and volumetric water content profile. The results indicate that soil water content near soil and crack surfaces decreases more rapidly and air humidity influences the evaporation rate.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Electrical & Electronic
Bo Li, Ningjun Jiang, Xiaole Han
Summary: In this study, convolutional neural networks (DnCNN) are used to denoise the Brillouin gain spectrum (BGS) images in order to improve the measurement accuracy of strain vibration using small gain stimulated Brillouin scattering (SBS) STFT-BOTDR. The results show that denoising the BGS images along the time axis leads to better detection of strain vibration compared to denoising along the fiber length. The best denoising performance is achieved with a DnCNN network with 8 layers and 200 epochs, resulting in a frequency uncertainty of 2.32 MHz and an R-squared value of 0.907. The frequency uncertainty is improved to about 45% of the original value.
IEEE PHOTONICS JOURNAL
(2023)
Article
Engineering, Environmental
Bo Xu, Junde Qin, Yaolin Yi
Summary: This study introduces an innovative approach by reusing industrial waste and greenhouse gas for fast immobilization of zinc, providing triple benefits of immobilizing zinc, mitigating waste landfilling, and capturing CO2.
RESOURCES CONSERVATION AND RECYCLING
(2023)