Article
Construction & Building Technology
Zhiduo Zhu, Wangwen Huo, He Sun, Borui Ma, Liu Yang
Summary: The objective of this research was to investigate the effects of different granulated blast furnace slag (GBFS) on the unconfined compressive strength, sorptivity, and pore structures of recycled concrete fine powder (RCFP) based geopolymers. Tests were conducted to measure the unconfined compressive strength, sorptivity coefficient, and analyze the pore structures using SEM and MIP methods. The results showed that the incorporation of GBFS effectively reduced the sorptivity coefficient and increased the unconfined compressive strength. SEM analysis revealed that GBFS improved the degree of reaction, leading to a refinement of the internal pore structure. The addition of GBFS also facilitated the conversion of macropores into micropores, reducing porosity and pore size.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Xiao Han, Jingjing Feng, Baomin Wang
Summary: The microscopic pore structure and compressive strength of fly ash-cement composite cementitious materials were measured at 20 degrees C and 60 degrees C using mercury intrusion porosimetry and compressive strength test. The fractal dimensions of each specimen were calculated and the relationship between fractal dimension and pore structure parameters were analyzed. A mathematical model was established to characterize the relationship between pore structure and compressive strength. The research results showed that the fractal dimension can directly reflect the relationship between compressive strength and pore structure.
CEMENT & CONCRETE COMPOSITES
(2023)
Article
Construction & Building Technology
Yi Li, Pengxiang Wang, Fuzhou Wang, Xiaotian Zheng, Yan Gao
Summary: The relationship between pore structure and compressive strength of tailings ball concrete was investigated. It was found that adding sand admixture improves the compressive strength. The use of fractal calculations and a composite pore structure parameter P provides a better evaluation of the compressive strength of tailings ball concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Xin Zhang, Yongqi Wei, Junqing Zuo, Yu Luo, Boyuan Wang, Wu Yao
Summary: This study utilized fractal geometry to characterize the complex pore structure of cement-based materials more accurately. The relationship between segmented fractal dimension and compressive strength was found to vary for different pore ranges, with positive and negative linear functions for gel pores and large pores, respectively. The proposed strength equations based on segmented fractal dimension showed high prediction accuracy according to regression analysis.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Article
Geochemistry & Geophysics
Hongwei Deng, Tao Duan, Guanglin Tian, Yao Liu, Weiyou Zhang
Summary: This study investigates the relationship between pore characteristics and mechanical properties of cemented tailings backfill, finding that harmless and less harmful pores make up a majority of internal pores. Some pore structure parameters have a strong correlation with compressive strength, particularly the proportion of harmless pores and fractal dimension of harmful pores. The strength prediction model shows significant results with a high correlation coefficient of 0.9524, suggesting accurate and reliable predictions.
Article
Engineering, Chemical
Kang Zhao, Chao Ma, Jian Yang, Jun Wu, Yajing Yan, Yanming Lai, Wenqiang Ao, Yi Tian
Summary: Uniaxial compression tests and NMR tests were conducted to investigate the pore fractal characteristics of fiber-reinforced backfill with different cement-tailing ratios and fiber types. The results showed a reduction in signal amplitude and spectral peak area for the fiber-reinforced backfill compared to the fiber-free backfill. The compressive strength and elastic modulus decreased with decreasing cement-tailings ratio. The fractal dimensions of micro, meso, and macropores were quantified and showed no significant correlation with the cement-tailings ratio and fiber type.
Article
Construction & Building Technology
Ketholyn J. Bespalhuk, Tiego J. C. de Oliveira, Joao V. P. Valverde, Rhudyeris A. Goncalves, Lucas Ferreira-Neto, Paula C. S. Souto, Josmary R. Silva, Nara C. de Souza
Summary: Cement is a commonly used construction material due to its cohesive properties, low cost, versatility, and moldability. The microstructure and properties of cementitious materials are affected by curing conditions and time. In this study, cylindrical specimens were fabricated to investigate the effect of curing conditions on the morphology and compressive strength of hardened pastes. The results showed that with increased curing time, the fractal dimensions of the hydrated cement increased, leading to an increase in compressive strength.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Chemistry, Physical
Wioleta Iskra-Kozak, Janusz Konkol
Summary: This article explores the effects of aluminum nanoxide on the physical, strength, and structural properties of cement mortars. It is found that the addition of 1% aluminum nanoxide leads to a significant increase in compressive strength and influences the fractal dimensions of the fracture surface profile lines.
Article
Engineering, Geological
Kai Wu, Qingshan Meng, Chi Wang, Qinglong Qin, Zhiwei Dong
Summary: This study analyzed the uniaxial compression behavior and pore structural characteristics of four types of coral reef limestone (CRL) using the uniaxial compression test and CT scanning test. The results showed different types of CRL exhibited single-peak or multi-peak uniaxial compressive curves, with brittle failure occurring in Coral Framework Limestone (CFL) and Coral Boulder Limestone (CBL), and ductile failure with increasing porosity in Coral Gravel Limestone (CGL) and Coral Calcarenite Limestone (CCL). CT scanning test revealed the influence of pore structure on the damage mechanism of CRL. An empirical formula for estimating uniaxial compressive strength (UCS) of CRL based on fractal dimension was established, and a quality evaluation method suitable for practical engineering was proposed.
ENGINEERING GEOLOGY
(2023)
Article
Engineering, Chemical
Yuwen Zhu, Haiyang Liu, Tianyang Wang, Yuanjie Wang, Hanqiao Liu
Summary: A series of activated carbons were prepared from Datong bituminous coal by steam activation, and the fractal dimensions of pore structures were determined using low-temperature nitrogen adsorption and the Frenkel-Halsey-Hill model. The results showed that both micro- and mesopores were fully developed during steam activation, with activation at 750°C being more conducive to the development of pore structures, especially mesopores. The surface roughness and structure complexity of the activated carbons changed during the activation process, as indicated by the variation of their surface and structure fractal dimensions.
Article
Geosciences, Multidisciplinary
Sai Xu, Zhengming Yang, Songtao Wu, Lei Wang, Wei Wei, Feng Yang, Jianchao Cai
Summary: Pore structure is a critical factor influencing the physical properties of oil and gas reservoirs, and it varies greatly with the reservoir rock type. This study analyzed the pore structures of shale and sandstone using low-pressure nitrogen adsorption experiments and fractal theory. The results showed significant differences in pore shape, distribution, specific surface area, and pore size between shale and sandstone. Fractal dimensions were found to be important parameters in characterizing the pore structure. The study highlights the usefulness of fractal theory in characterizing unconventional reservoirs.
NATURAL RESOURCES RESEARCH
(2022)
Article
Construction & Building Technology
Yinchuan Guo, Shengli Wu, Zhenghua Lyu, Aiqin Shen, Lei Yin, Cuizhen Xue
Summary: The study showed that the incorporation of CWCPM in concrete can enrich the quantity and types of hydration products, improve the pore structure, and provide a complementary effect on the cementitious material. The optimal compressive strength and permeability of concrete were achieved when the CWCPM mixing amount was 30%.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Energy & Fuels
Fei Gao, Ji Xia, Rui-jie Sun, Ya-fei Shan, Zhe Jia
Summary: Injecting power plant flue gas into goaf for sequestration can effectively reduce CO2 emissions and inhibit coal spontaneous combustion. The study on the chemical environment's effect on CO2 sequestration revealed that inhibitors can significantly increase coal's CO2 adsorption capacity, enhancing the sequestration capacity of flue gas in goaf. Additionally, the pore volume and specific surface area of coal increased significantly after inhibition, contributing to the increase in CO2 adsorption capacity.
Article
Energy & Fuels
Dan Li, Yuan Bao, Yaya Wang, Chao An, Jianing Chang
Summary: The aim of microbially-enhanced coalbed methane (MECBM) generation is to simulate the natural process of microbial methane production and increase coalbed methane production. This study investigated the changes in pore and molecular structures during the bioconversion of coal to methane. The results showed that MECBM is a process of carbon enrichment, nitrogen/sulfur fixation, and dehydrogenation/deoxygenation. Microbes modify the coal pore structure by destroying aliphatic side chains, dissociating small molecular clusters, and reducing the degree of aromaticity. This changes the coal reservoir spatial structure, resulting in the transformation of micropores to transition pores and mesopores, and increasing the average pore width and reducing the specific surface area. This process benefits the desorption and transportation of coalbed methane.
Article
Construction & Building Technology
Guosheng Xiang, Danqing Song, Huajian Li, F. E. Jalal, Hao Wang, Yinkang Zhou
Summary: An aged steel slag was utilized as fine aggregate to prepare foam concrete in order to improve its resource utilization rate. The optimal mixture ratio was determined based on particle size, SSR, and water-binder ratio, with 20% SSR showing the most uniform pore distribution and compact structure. The relationship between compressive strength and porosity of the foam concrete has been established using fractal theory.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Mingyang Wu, Wensong Wang, Dongming Zhang, Bozhi Deng, Shumin Liu, Jun Lu, Yafei Luo, Wanchun Zhao
Summary: This study proposes a pixel crack reconstruction method based on digital image processing and mathematical morphology theory, combined with crack geological models and the cohesive element method for simulation. Results show that improving the resolution of the fracture image can enhance reconstruction accuracy, while possible heterogeneous characteristics can influence fracture evolution.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Environmental Sciences
Ting Lu, Wensong Wang, Zuoan Wei, Yonghao Yang, Guansen Cao
Summary: The study found that phosphogypsum exhibits medium compressibility and medium to weak permeability characteristics. Shear strength and deformation modulus significantly increased with increasing dry density and consolidation confining pressure. Liquefaction resistance curves were expressed by power functions, shifting higher and becoming steeper with increasing dry density. The Davidenkov model was found to be more suitable for describing the relationship between the dynamic shear modulus ratio and damping ratio of PG compared to the Hardin-Drnevich model.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Engineering, Chemical
Changbao Jiang, Xiaodong Liu, Wensong Wang, Wenhui Wei, Minke Duan
Summary: The evolution of pores and fractures in reservoir rocks under triaxial stress conditions was studied using CT scanning and real-time AE signal monitoring. The process can be divided into three stages: initial, expansion, and penetration; shale has a shorter penetration stage compared to coal, indicating a more rapid failure process; modified brittleness index calculation formulas for shale were established and verified with CT scan results.
Article
Environmental Sciences
Weile Geng, Wensong Wang, Zuoan Wei, Gun Huang, Xiaofei Jing, Changbao Jiang, Sen Tian
Summary: This study investigated the effect of moisture content on the deformation characteristics of unsaturated tailings and found that different moisture contents of tailings exhibit similar deformation characteristics under load, which can be divided into four stages, with an optimal moisture content corresponding to maximum deformation resistance. The influence of the liquid bridge regime on the mesostructure deformation of unsaturated tailings was also discussed in this study.
Article
Engineering, Environmental
Jun Lu, Changbao Jiang, Zhuo Jin, Wensong Wang, Wanjun Zhuang, Huan Yu
Summary: Underground mining engineering induces complex three-dimensional stress changes, disrupts the original stress balance, and causes deformation, fracturing, and ground subsidence. A large-scale three-dimensional physical similarity model was developed to study the mining process of coal seams, revealing evident fractured fields around the goaf. The research results can provide valuable references for the stability of deep underground projects such as coal mining, tunnel excavation, and nuclear waste storage.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2021)
Article
Environmental Sciences
Kehui Liu, Hai Cai, Xiaofei Jing, Yulong Chen, Lu Li, Shangwei Wu, Wensong Wang
Summary: This study focuses on the microscopic characteristics of hydraulic erosion of reinforced tailings dams, revealing the relationship between different reinforcement spacing and the critical incipient velocity of tailings particles. The results show that smaller reinforcement spacing leads to a larger incipient velocity of the reinforced tailings sample. A reinforcement coefficient is introduced to establish the incipient velocity formula of reinforced tailings particles, providing theoretical support for studying the hydraulic erosion rate of a reinforced tailings dam.
Article
Energy & Fuels
Changbao Jiang, Zhengke Li, Wensong Wang, Zhijie Wen, Minke Duan, Weile Geng
Summary: Through triaxial servo-controlled seepage experiments, mechanical characteristics, seepage laws, energy dissipation, and fracture evolution of coal containing gas were studied under incremental tiered cyclic loading and different confining pressures. The results showed that the axial relative residual strain curve exhibited an N shape as axial stress increased, and dissipated energy increased linearly with the cycle number and different confining pressures. Fracture expansion during the yield-failure stage caused significant residual deformation and a sharp increase in energy dissipation and elastic modulus.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2021)
Article
Construction & Building Technology
Ting Lu, Zuoan Wei, Wensong Wang, Yonghao Yang, Guansen Cao, Ya Wang, Haidong Liao
Summary: The study introduces a novel mixing method for reinforcing tailings using microbially induced calcite precipitation (MICP), which shows better reinforcement effect compared to traditional grouting methods. The method improves the uniformity of fine-grained tailings and could be beneficial for microbial geotechnical technologies.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Geosciences, Multidisciplinary
Xuanyi Chen, Xiaofei Jing, Yulong Chen, Changshu Pan, Wensong Wang
Summary: The concentration of slurry significantly influences the flow characteristics, with impact force and velocity increasing as concentration decreases, and flow height increasing as concentration decreases. This study provides insights into how slurry concentration affects flow characteristics, which can guide downstream evacuation planning.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Polymer Science
Wensong Wang, Guansen Cao, Ye Li, Yuxi Zhou, Ting Lu, Binbin Zheng, Weile Geng
Summary: This study examines the mechanical properties of lime-stabilized basalt fiber-reinforced loess under freeze-thaw cycles. The results demonstrate that the addition of basalt fiber and lime enhances the strength of loess and improves its resistance to freeze-thaw damage. Additionally, it is found that there is a linear relationship between UCS and Vp, and Vp can be used to estimate UCS.
Article
Geosciences, Multidisciplinary
Wensong Wang, Guansen Cao, Ye Li, Yuxi Zhou, Ting Lu, Ya Wang, Binbin Zheng
Summary: The construction period of most tailing ponds is usually over ten years and may be affected by earthquakes and mining activities. The reconsolidation process of tailings after liquefaction, caused by earthquakes or vibrations, is prolonged. Changes in the nature of tailings due to previous earthquakes will affect the performance of tailing dams in subsequent earthquakes. The research results are of great significance for the safe disposal of tailings, especially those in earthquake-prone areas.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Binbin Zheng, Jiahe Wang, Tingting Feng, Wensong Wang, Yuxi Zhou, Guansen Cao, Yufei Wang
Summary: This study proposes an effective and reliable method for analyzing the evolution of tailings pond dam failure risk by combining DEMATEL and MISM. The results indicate that both personnel and systemic risks are important factors affecting the stability of tailings ponds. Rainfall intensity is also a key factor, and appropriate measures can effectively reduce the risk of dam failure. The establishment of a risk factor transfer network diagram helps understand the process of risk transfer.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Energy & Fuels
Qiangui Zhang, Shilin Zhao, Wensong Wang, Xiangyu Fan, Yongchang Liang, Zhigang Jiang, Like Wei, Qiang Yuan
Summary: Coal is highly sensitive to stress, pore pressure, and temperature, making its mechanical behaviors easily influenced by drilling operations. This study investigated the stress redistribution and mechanical behaviors of coal during drilling in CBM reservoirs. Triaxial compression tests were conducted under various stress conditions to evaluate the effects of axial loading rate, pore pressure, and temperature on coal deformation. The results indicated that the deformation of coal can be categorized into elastic, plastic, and stress reduction stages under the LAS-UCP stress path. The loading rate, pore pressure, and temperature significantly affected the mechanical properties of coal, including compressive strength, elastic modulus, and strain characteristics. The findings have important implications for safe drilling operations and engineering constructions involving coal seams.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2023)
Article
Computer Science, Artificial Intelligence
Binbin Zheng, Jiahe Wang, Tingting Feng, Wensong Wang, Yufei Wang, Yonghao Yang, Guangjin Wang
Summary: This study establishes an optimized ensemble learning prediction model using a genetic algorithm for the quick and efficient determination of landslide susceptibility. The model incorporates Xgboost and GBDT algorithms and achieves better prediction accuracy and applicability compared to traditional statistical learning methods. The developed optimized machine learning model accurately predicts landslide susceptibility and requires parameter optimization on a case-by-case basis for more accurate results.
INTERNATIONAL JOURNAL OF INTELLIGENT SYSTEMS
(2023)
Article
Thermodynamics
Yong Cheng, Fukai Song, Lei Fu, Saishuai Dai, Zhiming Yuan, Atilla Incecik
Summary: This paper investigates the accessibility of wave energy absorption by a dual-pontoon floating breakwater integrated with hybrid-type wave energy converters (WECs) and proposes a hydraulic-pneumatic complementary energy extraction method. The performance of the system is validated through experiments and comparative analysis.
Article
Thermodynamics
Jing Gao, Chao Wang, Zhanwu Wang, Jin Lin, Runkai Zhang, Xin Wu, Guangyin Xu, Zhenfeng Wang
Summary: This study aims to establish a new integrated method for biomass cogeneration project site selection, with a focus on the application of the model in Henan Province. By integrating Geographic Information System and Multiple Criterion Decision Making methods, the study conducts site selection in two stages, providing a theoretical reference for the construction of biomass cogeneration projects.
Article
Thermodynamics
Mert Temiz, Ibrahim Dincer
Summary: The current study presents a hybrid small modular nuclear reactor and solar-based system for sustainable communities, integrating floating and bifacial photovoltaic arrays with a small modular reactor. The system efficiently generates power, hydrogen, ammonia, freshwater, and heat for residential, agricultural, and aquaculture facilities. Thermodynamic analysis shows high energy and exergy efficiencies, as well as large-scale ammonia production meeting the needs of metropolitan areas. The hybridization of nuclear and solar technologies offers advantages of reliability, environmental friendliness, and cost efficiency compared to renewable-alone and fossil-based systems.
Editorial Material
Thermodynamics
Wojciech Stanek, Wojciech Adamczyk
Article
Thermodynamics
Desheng Xu, Yanfeng Li, Tianmei Du, Hua Zhong, Youbo Huang, Lei Li, Xiangling Duanmu
Summary: This study investigates the optimization of hybrid mechanical-natural ventilation for smoke control in complex metro stations. The results show that atrium fires are more significantly impacted by outdoor temperature variations compared to concourse/platform fires. The gathered high-temperature smoke inside the atrium can reach up to 900 K under a 5 MW train fire energy release. The findings provide crucial engineering insights into integrating weather data and adaptable ventilation protocols for smoke prevention/mitigation.
Article
Thermodynamics
Da Guo, Heping Xie, Mingzhong Gao, Jianan Li, Zhiqiang He, Ling Chen, Cong Li, Le Zhao, Dingming Wang, Yiwei Zhang, Xin Fang, Guikang Liu, Zhongya Zhou, Lin Dai
Summary: This study proposes a new in-situ pressure-preserved coring tool and elaborates its pressure-preserving mechanism. The experimental and field test results demonstrate that this tool has a high pressure-preservation capability and can maintain a stable pressure in deep wells. This study provides a theoretical framework and design standards for the development of similar technologies.
Article
Thermodynamics
Aolin Lai, Qunwei Wang
Summary: This study assesses the impact of China's de-capacity policy on renewable energy development efficiency (REDE) using the Global-MSBM model and the difference-in-differences method. The findings indicate that the policy significantly enhances REDE, promoting technological advancements and marketization. Moreover, regions with stricter environmental regulations experience a higher impact.
Article
Thermodynamics
Mostafa Ghasemi, Hegazy Rezk
Summary: This study utilizes fuzzy modeling and optimization to enhance the performance of microbial fuel cells (MFCs). By simulating and analyzing experimental data sets, the ideal parameter values for increasing power density, COD elimination, and coulombic efficiency were determined. The results demonstrate that the fuzzy model and optimization methods can significantly improve the performance of MFCs.
Article
Thermodynamics
Zhang Ruan, Lianzhong Huang, Kai Wang, Ranqi Ma, Zhongyi Wang, Rui Zhang, Haoyang Zhao, Cong Wang
Summary: This paper proposes a grey box model for fuel consumption prediction of wing-diesel hybrid vessels based on feature construction. By using both parallel and series grey box modeling methods and six machine learning algorithms, twelve combinations of prediction models are established. A feature construction method based on the aerodynamic performance of the wing and the energy relationship of the hybrid system is introduced. The best combination is obtained by considering the root mean square error, and it shows improved accuracy compared to the white box model. The proposed grey box model can accurately predict the daily fuel consumption of wing-diesel hybrid vessels, contributing to operational optimization and the greenization and decarbonization of the shipping industry.
Article
Thermodynamics
Huayi Chang, Nico Heerink, Junbiao Zhang, Ke He
Summary: This study examines the interaction between off-farm employment decisions between couples and household clean energy consumption in rural China, and finds that two-paycheck households are more likely to consume clean energy. The off-farm employment of women is a key factor driving household clean energy consumption to a higher level, with wage-employed wives having a stronger influence on these decisions than self-employed ones.
Article
Thermodynamics
Hanguan Wen, Xiufeng Liu, Ming Yang, Bo Lei, Xu Cheng, Zhe Chen
Summary: Demand-side management is crucial to smart energy systems. This paper proposes a data-driven approach to understand the relationship between energy consumption patterns and household characteristics for better DSM services. The proposed method uses a clustering algorithm to generate optimal customer groups for DSM and a deep learning model for training. The model can predict the possibility of DSM membership for a given household. The results demonstrate the usefulness of weekly energy consumption data and household socio-demographic information for distinguishing consumer groups and the potential for targeted DSM strategies.
Article
Thermodynamics
Xinglan Hou, Xiuping Zhong, Shuaishuai Nie, Yafei Wang, Guigang Tu, Yingrui Ma, Kunyan Liu, Chen Chen
Summary: This study explores the feasibility of utilizing a multi-level horizontal branch well heat recovery system in the Qiabuqia geothermal field. The research systematically investigates the effects of various engineering parameters on production temperature, establishes mathematical models to describe their relationships, and evaluates the economic viability of the system. The findings demonstrate the significant economic feasibility of the multi-level branch well system.
Article
Thermodynamics
Longxin Zhang, Songtao Wang, Site Hu
Summary: This investigation reveals the influence of tip leakage flow on the modern transonic rotor and finds that the increase of tip clearance size leads to a decline in rotor performance. However, an optimal tip clearance size can extend the rotor's stall margin.
Article
Thermodynamics
Kristian Gjoka, Behzad Rismanchi, Robert H. Crawford
Summary: This paper proposes a framework for assessing the performance of 5GDHC systems and demonstrates it through a case study in a university campus in Melbourne, Australia. The results show that 5GDHC systems are a cost-effective and environmentally viable solution in mild climates, and their successful implementation in Australia can create new market opportunities and potential adoption in other countries with similar climatic conditions.
Article
Thermodynamics
Jianwei Li, Guotai Wang, Panpan Yang, Yongshuang Wen, Leian Zhang, Rujun Song, Chengwei Hou
Summary: This study proposes an orientation-adaptive electromagnetic energy harvester by introducing a rotatable bluff body, which allows for self-regulation to cater for changing wind flow direction. Experimental results show that the output power of the energy harvester can be greatly enhanced with increased rotatory inertia of the rotating bluff body, providing a promising solution for harnessing wind-induced vibration energy.
