Article
Computer Science, Interdisciplinary Applications
Shufan Cheng, Yang Ye, Yawu Zeng, Rui Gao, Xiangrui Qin
Summary: In this study, the failure process of the cement mortar-clay rock (C-C) binary was analyzed using a composite hybrid FEM/DEM model. The results showed that besides interface debonding, the fracture of the weaker side material (clay rock) is also a potential failure mode. The failure mode changes from shear failure of the clay rock to interface debonding when the normal pressure reaches 200 kPa.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Construction & Building Technology
Juanjuan Ren, Wenlong Ye, Shijie Deng, Wei Du, Kaiyao Zhang
Summary: This paper investigates the dynamic damage law of CA mortar under different strain rate conditions and discusses how the damage affects the track structure's dynamic response. The results reveal various factors contributing to the damage of the mortar.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Mahmudul Hasan Mizan, Koji Matsumoto
Summary: The proposed modified 5% silica fume (M) polymer cement mortar (PCM) overlay is effective in delaying debonding and enhancing the bond between concrete and PCM. The use of MPCM overlay and reinforcement improves the crack behavior and load-carrying capacity. The configuration of MPCM overlay and reinforcement ratio between strengthening and main bar delays debonding failure and ensures uniform shear stress transfer at the overlay-concrete interface.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Mian Luo, Jingquan Bai, Kang Jing, Ziqi Ding, Dingyi Yang, Chunxiang Qian
Summary: This study developed artificial functional aggregates with fly ash, silica fume, metakaolin, limestone powder, and sodium carbonate powder to promote the self-healing efficiency of concrete. Experimental results showed that the artificial functional aggregates effectively improved the self-healing capacity of mortar specimens, leading to increased closure ratio of surface crack and better regain of water tightness. The major healing product in the crack was calcite precipitation, with more calcium carbonate precipitations observed in mortars with artificial functional aggregates compared to the control mortar.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Xin Shi, Jiajia Cheng, Lingling Xu, Tao Feng, Jian Han, Pan Zhang, Zemeng Guo
Summary: This study investigates the effects of two polymers on the mechanical properties, abrasion resistance, and toughness of cement mortars. The study combines microscopy and image processing software to analyze the microstructure of polymer modified mortars. The results show that the use of alternating wet and dry curing regimes improves the toughness of the modified mortar and that the addition of polymers significantly enhances the abrasion and impact resistance of the cement mortar.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Construction & Building Technology
Chengbin Yuan, Yu Cai, Qiang Gu, Di Sang
Summary: This paper improves the cement mortar by adding polymer dispersible polymer powder, using orthogonal experimental design method to study a modified high-performance mortar with higher mechanical properties and fluidity, providing a new idea for the connecting materials of prefabricated buildings.
INTERNATIONAL JOURNAL OF CONCRETE STRUCTURES AND MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Changxing Zhu, Xu Liu, Yeming An, Weihao Zhao
Summary: This study investigates the failure mechanism of interface debonding in an anchor structure using a transparent similar rock-anchoring structure and a new rockbolt impact load test system. The results reveal the key characteristics and failure modes of the debonding process through both experimental and simulation analyses.
APPLIED SCIENCES-BASEL
(2022)
Article
Mechanics
Yafang Zhang, Chenggui Ou, Hao Liu, Juan Lu, Congmi Cheng, Juan He
Summary: This study used a split Hopkinson pressure bar system to apply high-speed dynamic load to a flattened Brazilian disc and investigated the dynamic characteristics of fractures. A three-dimensional numerical model based on nonuniform material distribution was developed, showing that strain rate and inclination angle influenced the strength and toughness of dynamic fractures. Experimental and numerical results were in good agreement, indicating the importance of mesoscopic nonuniformity in the model for simulating the failure process of secondary cracks.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Construction & Building Technology
M. Miro, J. N. Eiras, P. Poveda, M. A. Climent, J. Ramis
Summary: The sensitivity of intermodulation of ultrasonic waves in detecting different damage states of concrete due to steel corrosion has been studied. An acceptable upper control limit for the initial Intensity Modulation Ratio (R) values has been established. It was observed that the degree of damage is positively correlated with the value ranges and variability degree of R after corrosion tests.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Yue Li, Jianglin Liu, Yinuo Li, Caiyun Jin, Hui Lin, Hongwen Li
Summary: This study investigated the effect of glass microbeads volume content on the electromagnetic transmission performance of prefabricated composites. The results showed that the glass microbeads affected the transmission path of electromagnetic wave and the electric field strength, magnetic field strength, and energy loss distribution of the composites. The main reason for the improvement in electromagnetic transmission performance was that the extreme values of the reflection and absorption coefficients decreased with increasing glass microbeads content, resulting in a 343.5% increase in the electromagnetic transmission coefficient for a content of 70% glass microbeads.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Engineering, Civil
Wanqian Wang, Jingfeng Wang, Lei Guo, Yong Liu, Rong Zhang
Summary: This study focused on the cyclic performance of prefabricated CFS shear walls filled with lightweight EPS mortars, designed and tested four different types of shear walls for evaluation, established three-dimensional finite element models with experimental data, explored the connection strength between shear wall components, and proposed a simplified model to predict the bearing capacity of the shear wall.
ENGINEERING STRUCTURES
(2021)
Article
Energy & Fuels
Sohrab Gheibi, Nicolaine Agofack, Sigbjorn Sangesland
Summary: In this study, the stability of cement sheaths in wells under extreme loading conditions was numerically analyzed using the modified discrete element method (MDEM). Various factors affecting the stability of cement sheaths were investigated, including casing size, rock elastic parameters, and loading time. The simulation results showed the evolution of stress states, radial fracturing, shear failure, and interface debonding, providing insights into the potential environmental, technical, and economic issues associated with damaged cement sheaths.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Civil
Pshtiwan Shakor, Nadarajah Gowripalan, Habib Rasouli
Summary: This study focused on the experimental and numerical analysis of cement mortar materials in 3D printing, aiming to determine the optimum strength and mechanical properties of printed structural components. The results confirmed the orthotropic properties of printed cementitious materials and validated the numerical model for simulation of structural components. The findings are valuable in determining the optimal features of 3D printed structures.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2021)
Article
Chemistry, Physical
Zhiming Chao, Chuanxin Yang, Wenbing Zhang, Ye Zhang, Jiaxin Zhou
Summary: The presence of internal cracks affects the gas permeability of sustainable cement mortar, making it crucial for the durability and stability of buildings. However, predicting the gas permeability of such mortar poses challenges due to various influential factors and complex interdependent mechanisms. This study proposes an innovative machine learning algorithm, integrating the Mind Evolutionary Algorithm (MEA) with the Adaptive Boosting Algorithm-Back Propagation Artificial Neural Network (ABA-BPANN) ensemble algorithm, to accurately predict gas permeability based on 1452 test results. The MEA-tuned ABA-BPANN model is compared with conventional machine learning models and demonstrates its effectiveness in predicting gas permeability. Sensitivity analysis reveals that the dimensions and quantities of cracks have a more profound impact on the gas permeability of durable cement mortar than stress conditions. The MEA-optimised ABA-BPANN algorithm holds significant potential in estimating gas permeability in different stress environments and providing insights for related structure design.
Article
Construction & Building Technology
Levent Koroglu, Derya Over Kaman, Erhan Ayas
Summary: The study found that heat-treated boron derivative wastes used as replacements for Portland cement significantly affected the strength of mortars due to their particle size distribution. Smaller particle sizes decreased the strength of mortars, while larger particle sizes reduced the strength significantly.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Oceanography
W. L. Chen, N. Dodd, M. C. H. Tiessen, D. Calvete
CONTINENTAL SHELF RESEARCH
(2018)
Article
Oceanography
W. L. Chen, N. Dodd
CONTINENTAL SHELF RESEARCH
(2019)
Article
Thermodynamics
Guo Xie, Wenlong Chen, Tiantong Yan, Jiguo Tang, Hongtao Liu, Shunze Cao
ENERGY CONVERSION AND MANAGEMENT
(2020)
Article
Oceanography
W. L. Chen, N. Dodd
Summary: The study extends the 1D nonlinear model to include wave streaming and depth-varying mean return flow, achieving physically consistent values for bed perturbation migration rates in the nearshore region. The model is applied to a profile with multiple nearshore bars and is driven by recorded wave and tide signals to simulate six months of nourishment evolution, showing accurate predictions in calm conditions but divergence in storm periods. Wave height is identified as the primary control parameter for perturbed sediment flux, with wave period, angle of incidence, and tide level as secondary factors.
CONTINENTAL SHELF RESEARCH
(2021)
Article
Engineering, Chemical
Tiantong Yan, Guo Xie, Wenlong Chen, Zhanglin Wu, Jialing Xu, Yingzhang Liu
Summary: Solar stills are commonly used to provide fresh water to small communities in remote areas, although they have low freshwater yield. A novel system with periodic pressure control and water immersion cooling has been proposed to increase yield and reduce energy consumption. Results showed significantly improved performance compared to traditional systems, making it an affordable desalination technique for off-grid communities.
Article
Environmental Sciences
Wen L. Chen, Peter Muller, Robert C. Grabowski, Nicholas Dodd
Summary: This study explores a novel form of nourishment called "green nourishment" which combines shoreface nourishment and seagrass restoration to mitigate coastal erosion. The modeling results suggest that a seagrass meadow can enhance wave energy dissipation and reduce sediment erosion when implemented in a sheltered nearshore area. Green nourishment also showed effectiveness in reducing beach foreshore erosion caused by storm events.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Wen L. Chen, Robert C. Grabowski, Saurav Goel
Summary: Using molecular dynamics simulation, this study successfully simulated the free 1W-2W transition during clay hydration for the first time and identified the underlying mechanism as the detachment of cations from the clay surface and the formation of a shell of water molecules around the cation. The swelling dynamics of clay was found to be influenced by factors such as clay charge, clay mineralogy, and counterions, highlighting complex cation-clay interactions and cation hydration capacity.
Article
Mining & Mineral Processing
Hao Shi, Lei Song, Houquan Zhang, Wenlong Chen, Huasheng Lin, Danqi Li, Guozhu Wang, Huayun Zhao
Summary: Understanding the progressive debonding mechanism of bolts is crucial for underground safety. This paper conducted laboratory experiments and numerical simulations of pull-out tests. The relationship between the pull-out strength of the bolt and the uniaxial compressive strength of the cement mortar material was established, and the locations of cracks were identified using the acoustic emission technique. The results revealed that the axial displacement of the cement mortar material at the peak load was approximately 5 mm, and the peak load of the bolt increased with the strength of the confining medium.
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
(2022)
Article
Environmental Sciences
Hao Shi, Wenlong Chen, Houquan Zhang, Lei Song
Summary: This study proposes new concepts of pseudo-cohesion and pseudo-internal friction angle, which take into account both pre-peak and post-peak stage information. These parameters are derived as functions of maximum principal strain and are found to be related to the axial strain and confining pressure. The evolution of rock pseudo-shear strength parameters is closely related to the propagation of rock cracks.
ENVIRONMENTAL EARTH SCIENCES
(2023)
Article
Green & Sustainable Science & Technology
W. L. Chen, G. Xie
Summary: Multi-stage solar desalination running under vacuum is a low-cost, effective and sustainable way to alleviate fresh water shortage. A predictive model for multi-stage tubular solar still under vacuum (MSSV) was developed and validated against field experiments. The study found that under typical weather conditions, a 3-stage tubular still produced the maximum water yield with an optimal operation pressure of 48 kPa. Stronger solar intensity led to higher water yield and optimal operation pressure. Increasing the stage number improved the fresh water yield but with diminishing marginal effect.
Article
Energy & Fuels
Xinyu Wei, Yingzhang Liu, Guo Xie, Wenlong Chen, Zhuocheng Jiang
Summary: Operating solar still under vacuum can significantly increase freshwater yield due to enhanced vapor flow. Smoke visualization technique was used to characterize the vapor flow field within a distillation chamber and help optimize the design. The experiment captured the acceleration of vapor flow and a correlation was presented to predict the yield of solar still. The study also classified different flow regimes based on Grashof number and provided guidance for optimal design in solar stills.
Article
Mechanics
Hao Shi, Chen Wenlong, Houquan Zhang, Song Lei, Li Ming, Wang Miaojing, Lu Pengju
Summary: This study investigated the effect of natural fractures on the dynamic impact strength of rock mass through numerical specimen simulations and experiments. The research found that the number of prefabricated fractures is related to stress transmission and impact strength.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Thermodynamics
Zhanglin Wu, Guo Xie, Fengsheng Gao, Wenlong Chen, Qingwen Zheng, Yingzhang Liu
Summary: A novel thermoelectric self-cooling concentrated photovoltaic (CPV) system was proposed in this study, which utilizes thermoelectric modules to provide energy for an auto-cooling scheme. Experimental validation showed that the self-cooling system effectively reduced the temperature of solar cells and improved output power and efficiency. Furthermore, a conceptual design of a 10 kW self-cooling CPV power station was carried out.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Construction & Building Technology
Hao Shi, Lei Song, Wenlong Chen, Houquan Zhang, Guozhu Wang, Guotao Yuan, Wenliang Zhang, Guiwu Chen, Yu Wang, Gang Lin
CONSTRUCTION AND BUILDING MATERIALS
(2020)
