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Frost Resistance of Pervious Concrete Mixed with Waste Glass Powder

Journal of Wuhan University of technology(Materials Science) 2024年第5期39卷 1325-1336页

作者： AN Baofeng LI Qiong QIAO Hongxia SU Rui WANG Xi WANG Chaoqun JIAO Daowei School of Civil Engineering Lanzhou University of TechnologyLanzhou 730050China Gansu Advanced Civil Engineering Materials Engineering Research Center Lanzhou 730050China China Construction First Group The Fifth Construction Co.Ltd Beijing 100000China

The contents of waste glass powder(WGP)(0%,10%,15%,20%,25%)and water-binder ratio(W/C)(0.24,0.26,0.28)were used as influencing factors,and the quality loss rate(Δm)and compressive strength loss rate(Δfc)were used as characterization *** Ca/Si ratio and main element contents of C-S-H gels with different WGP content were investigated by energy dispersive spectrometry(EDS).The pore structure evolution characteristics of WGP composite cementing materials were investigated by low field nuclear magnetic resonance(NMR).UsingΔfc as the index of frost resistance degradation and Weibull function,the frost resistance degradation of glass doped pervious concrete(WGP-PC)was *** results show that,with WGP,for the same number of cycles,Δm andΔfc decrease and increase with the increase of *** the same WGP content,Δm andΔfc decrease first and then increase with the increase of W/*** 100 freeze-thaw cycles,the samples with WGP content of 20%and W/C of 0.26 have the best *** tests show that with the increase of WGP content,the Ca/Si ratio of C-S-H gel decreases at first and then increases with the increase of WGP *** extreme value of Ca/Si is 2.36 when WGP is added by 20%.The pore volume of hardened paste with 20%WGP content decreased by 18.6%compared with that of cement system without *** overall compactness of the specimen was *** the basis of the test data,a life prediction model was established according to Weibull *** experiment showed thatΔfc could be used as a durability degradation index,and the slope of the reliability curve became gentle after WGP was added,which reduced the damage degradation rate of PC.W/C was ***'s about 5000 hours.

关键词： pervious concrete glass powder frost resistance energy dispersive analysis test low field nuclear magnetic resonance instrument life prediction

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SODIS with hydrogen peroxide: an effective household water treatment option under sub-tropical climatic conditions of bangladesh

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Environmental Science and Pollution Research 2024年第35期31卷 48279-48295页

作者： Khan, Md. Habibur Rahman Bejoy Karim, Md. Rezaul Nawmi, Mastura Morshed Rimi, Nafisa Anjum Ahsan, Amimul Imteaz, Monzur Alam Department of Civil and Environmental Engineering Islamic University of Technology Gazipur Bangladesh Department of Civil and Construction Engineering Swinburne University of Technology Melbourne Australia

Solar disinfection (SODIS) is an affordable and sustainable Household Water Treatment (HWT) method endorsed by WHO. However, its limitations include longer sunlight exposure requirements, incomplete microbial inactivation, and post-SODIS microbial regrowth during monsoon and winter seasons in subtropical climates. To address these limitations, the performance of SODIS with H2O2 for microbial inactivation during the monsoon and winter seasons in Bangladesh was evaluated following the WHO HWT protocols. Moreover, the process was verified using drinking water samples collected from restaurants, households, and slums. All SODIS experiments were conducted using reflective reactors with PET bottles and plastic bags, adding 10 mg/L of H2O2, and exposing them to sunlight for 6 h. The results showed that E. coli was completely inactivated within 2 h in plastic bags and within 3 h in PET bottles during the monsoon season, achieving an LRV of > 5. In winter, both achieved an LRV > 5 within 3 h and plastic bags showed more efficient in microbial inactivation than PET bottles. The microbial inactivation rates were 5 times higher than those of conventional SODIS. No regrowth of microorganisms was observed during the subsequent post-SODIS period of 12 h and 24 h at room temperature. The study findings suggest that SODIS with H2O2 has the potential for complete microorganism inactivation with shorter sunlight exposure in subtropical climates with moderate to low solar irradiation and can be adopted as a reliable disinfection option for rural and urban communities with unsafe drinking water supply. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Escherichia coli

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Fault Identification for Shear-Type Structures Using Low-Frequency Vibration Modes

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Computer Modeling in engineering & Sciences 2024年第3期138卷 2769-2791页

作者： Cuihong Li Qiuwei Yang Xi Peng School of Civil Engineering Shaoxing UniversityShaoxing312000China School of Civil and Transportation Engineering Ningbo University of TechnologyNingbo315211China Engineering Research Center of Industrial Construction in Civil Engineering of Zhejiang Ningbo University of TechnologyNingbo315211China

Shear-type structures are common structural forms in industrial and civil buildings,such as concrete and steel frame *** diagnosis of shear-type structures is an important topic to ensure the normal use of *** main drawback of existing damage assessment methods is that they require accurate structural finite element models for damage ***,for many shear-type structures,it is difficult to obtain accurate *** order to avoid finite elementmodeling,amodel-freemethod for diagnosing shear structure defects is developed in this *** method only needs to measure a few low-order vibration modes of the *** proposed defect diagnosis method is divided into two *** the first stage,the location of defects in the structure is determined based on the difference between the virtual displacements derived from the dynamic flexibility matrices before and after *** the second stage,damage severity is evaluated based on an improved frequency sensitivity *** innovations of this method lie in two *** first innovation is the development of a virtual displacement difference method for determining the location of damage in the shear *** second is to improve the existing frequency sensitivity equation to calculate the damage degree without constructing the finite *** has been verified on a numerical example of a 22-story shear frame structure and an experimental example of a three-story steel shear *** on numerical analysis and experimental data validation,it is shown that this method only needs to use the low-order modes of structural vibration to diagnose the defect location and damage degree,and does not require finite element *** proposed method should be a very simple and practical defect diagnosis technique in engineering practice.

关键词： Fault diagnosis shear steel structure vibration mode dynamic flexibility frequency sensitivity

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Public perception of connected and automated vehicles:Benefits,concerns,and barriers from an Australian perspective

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Journal of Intelligent and Connected Vehicles 2024年第2期7卷 108-128页

作者： Ali Matin Hussein Dia Department of Civil and Construction Engineering Swinburne University of TechnologyMelbourne 3122Australia

This study investigates the attitudes and concerns of the Australian public toward connected and autonomous vehicles(CAVs),and the factors influencing their willingness to adopt this *** a comprehensive survey,a diverse group of respondents provided valuable insights toward various CAV scenarios such as riding in a vehicle with no driver,self-driving public transport,self-driving taxis,and heavy vehicles without *** results highlight the significant impact of safety concerns about automated vehicles on individuals’attitudes across all *** levels of concern were associated with more negative attitudes,and a strong correlation between concerns and opposition underlines the necessity of addressing these apprehensions to build public trust and promote CAV ***,nearly 70%of respondents felt uncomfortable driving next to a CAV,but they displayed more confidence in adopting automated public transport in the near ***,around 40%of participants indicated a strong willingness to purchase a CAV,primarily driven by the desire to reduce their carbon footprint and safety ***,respondents with health conditions or disability exhibited heightened interest(almost double those without health conditions)in CAV *** differences emerged in attitudes and preferences toward CAVs,with women expressing a greater level of concern and perceiving higher barriers to CAV *** emphasizes the importance of employing targeted approaches to address the specific concerns of different *** study also underscores the role of trust in technology as a significant barrier to CAV deployment,ranking high among respondents’*** overcome these challenges and facilitate successful CAV deployment,various strategies are suggested,including live demonstrations,dedicated routes for automated public transport,adoption incentives,and addressing liability *** findings from this st

关键词： connected and automated vehicles(CAVs) autonomous vehicles public acceptance stakeholder consultations road safety

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Crack-controlled allowable forces for high-strength reinforced concrete columns under cyclic loading using finite element analysis

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Structure and Infrastructure engineering 2024年第4期20卷 514-528页

作者： Chien-Kuo, Chiu Krasna, Wiku A. Tandri, Alexander I. Department of Civil and Construction Engineering National Taiwan University of Science and Technology Taipei Taiwan

High-strength reinforced concrete (HSRC) columns have been gradually promoted in use. However, the crack-controlled design method for HSRC columns is still insufficient to ensure serviceability and reparability. Therefore, the main purpose of this work is to provide a simplified method for assessing crack damage to HSRC columns. For this purpose, Finite Element Analysis (FEA) is developed to simulate crack development in selected specimens. Additionally, the FEA results are used to identify the reduction factors that are related to the stiffness and the unloading stiffness and the ratio of shear deformation to total deformation, which are required in the force-crack quantification model. Finally, for practical use in the design, a simplified formula for building the relationship between the shear force and maximum residual crack width for an HSRC column is also proposed. For practical use in the design, this work conducts a case study to build the relationship between the shear force and damage level for an HSRC column. Restated, an engineer can use this relationship to determine the allowable shear forces for ensuring serviceability and reparability. © 2022 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Finite element method

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Experimental and Numerical Investigations of Carbon-based Nanoparticle Reinforcement on Microstructure and Mechanical Properties of Epoxy Coatings

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Chinese Journal of Polymer Science 2025年第1期43卷 211-224,I0013页

作者： Lu-Yang Xu Xing-Yu Wang Yi-Zhou Lin Ying Huang Cheng-Cheng Tao Da-Wei Zhang Department of Civil Constructionand Environmental EngineeringNorth Dakota State UniversityFargo58102USA School of Construction Management Technology Purdue UniversityWest Lafayette47907USA

The addition of nanoparticles serves as an effective reinforcement strategy for polymeric coatings,utilizing their unique characteristics as well as extraordinary mechanical,thermal,and electrical *** exceptionally high surface-to-volume ratio of nanoparticles imparts remarkable reinforcing potentials,yet it simultaneously gives rise to a prevalent tendency for nanoparticles to agglomerate into clusters within *** agglomeration behavior of the nanoparticles is predominantly influenced by their distinct microstructures and varied weight *** study investigated the synergistic effects of nanoparticle geometric shape and weight concentration on the dispersion characteristics of nanoparticles and the physical-mechanical performances of nano-reinforced epoxy *** carbon-based nanoparticles,nanodiamonds(NDs),carbon nanotubes(CNTs),and graphenes(GNPs),were incorporated into epoxy coatings at three weight concentrations(0.5%,1.0%,and 2.0%).The experimental findings reveal that epoxy coatings reinforced with NDs demonstrated the most homogenous dispersion characteristics,lowest viscosity,and reduced porosity among all the nanoparticles,which could be attributed to the spherical geometry *** to the superior physical properties,ND-reinforced nanocomposites displayed the highest abrasion resistance and tensile ***,the 1.0wt%ND-reinforced nanocomposites exhibited 60%,52%,and 97%improvements in mass lost,tensile strength,and failure strain,respectively,compared to pure ***,the representative volume element(RVE)modeling was employed to validate the experimental results,while highlighting the critical role of nanoparticle agglomeration,orientation,and the presence of voids on the mechanical properties of the ***-reinforced epoxy coatings with enhanced mechanical properties are well-suited for application in protective coatings for pipelines,industrial equipment,and automotive

关键词： Nano-reinforced composite Geometric shape Weight concentration Experimental characterization Finite element analysis(FEA) Representative volume element(RVE)modeling

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Multi-objective optimization of bucket drum for lunar regolith collectors with multi-surrogate model based on adaptive invocation mechanism

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Science China Technological Sciences 2025年第5期68卷 226-246页

作者： Haoran LI Yuyue GAO Lieyun DING Cheng ZHOU Shifeng WEN Yan ZHOU National Center of Technology Innovation for Digital Construction Huazhong University of Science and Technology School of Civil and Hydraulic Engineering Huazhong University of Science and Technology

This study presents a parametric design and optimization approach for bucket drum lunar regolith collector. Using discrete element method(DEM) simulations, the operational performance of the collector was analyzed, focusing on filling efficiency, collection rate, and evacuation rate. Three surrogate models—radial basis function(RBF), Gaussian process regression(GPR), and support vector regression(SVR)—were constructed to form a composite surrogate model. The performance of four multi-objective optimization algorithms(MOPSO, NSGA-II, SPEA-II, PESA-II) was compared, with MOPSO demonstrating the best results. An adaptive surrogate model invocation mechanism based on absolute error of leave-one-out cross-validation(AELOOCV) further enhanced optimization accuracy. The entropy weight method and TOPSIS were employed to select the optimal solution from the Pareto set, leading to improvements of 10.353% in filling efficiency, 13.275% in collection rate, and 12.070% in evacuation rate. The study highlights the effectiveness of combining surrogate models with advanced optimization algorithms in lunar soil collection design.

关键词： discrete element method lunar regolith collector multi-surrogate model multi-objective optimization

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A deep transfer learning model for the deformation of braced excavations with limited monitoring data

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Journal of Rock Mechanics and Geotechnical engineering 2025年第3期17卷 1555-1568页

作者： Yuanqin Tao Shaoxiang Zeng Tiantian Ying Honglei Sun Sunjuexu Pan Yuanqiang Cai College of Civil Engineering Zhejiang University of TechnologyHangzhou310023China Engineering Research Center of Ministry of Education for Renewable Energy Infrastructure Construction Technology Hangzhou310023China

The current deep learning models for braced excavation cannot predict deformation from the beginning of excavation due to the need for a substantial corpus of sufficient historical data for training *** address this issue,this study proposes a transfer learning model based on a sequence-to-sequence twodimensional(2D)convolutional long short-term memory neural network(S2SCL2D).The model can use the existing data from other adjacent similar excavations to achieve wall deflection prediction once a limited amount of monitoring data from the target excavation has been *** the absence of adjacent excavation data,numerical simulation data from the target project can be employed instead.A weight update strategy is proposed to improve the prediction accuracy by integrating the stochastic gradient masking with an early stopping *** illustrate the proposed methodology,an excavation project in Hangzhou,China is *** proposed deep transfer learning model,which uses either adjacent excavation data or numerical simulation data as the source domain,shows a significant improvement in performance when compared to the non-transfer learning *** the simulation data from the target project even leads to better prediction performance than using the actual monitoring data from other adjacent *** results demonstrate that the proposed model can reasonably predict the deformation with limited data from the target project.

关键词： Braced excavation Wall deflections Transfer learning Deep learning Finite element simulation

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Smart Techniques Promoting Sustainability in construction engineering and Management

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engineering 2025年第2期45卷 262-282页

作者： Song-Shun Lin Shui-Long Shen Annan Zhou Xiang-Sheng Chen Department of Civil Engineering School of Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China Guangdong Engineering Research Center for Smart Construction and Maintenance of Infrastructures of Coastal Cities Department of Civil Engineering and Smart CitiesCollege of EngineeringShantou UniversityShantou 515063China Discipline of Civil and Infrastructure Engineering School of EngineeringRoyal Melbourne Institute of Technology(RMIT)MelbourneVIC 3001Australia College of Civil and Transportation Engineering Shenzhen UniversityShenzhen 515063China Department of Civil and Environmental Engineering National University of SingaporeSingapore 117576Singapore

construction engineering and management(CEM)has become increasingly complicated with the increasing size of engineering projects under different construction environments,motivating the digital transformation of *** contribute to a better understanding of the state of the art of smart techniques for engineering projects,this paper provides a comprehensive review of multi-criteria decision-making(MCDM)techniques,intelligent techniques,and their applications in ***,a comprehensive framework detailing smart technologies for construction projects is ***,the characteristics of CEM are summarized.A bibliometric review is then conducted to investigate the keywords,journals,and clusters related to the application of smart techniques in CEM during *** advancements in intelligent techniques are also discussed under the following six topics:①big data technology;②computer vision;③speech recognition;④natural language processing;⑤machine learning;and⑥knowledge representation,understanding,and *** applications of smart techniques are then illustrated via underground space ***,future research directions for the sustainable development of smart construction are highlighted.

关键词： construction engineering and management Multi-criteria decision-making techniques Intelligent techniques Digital transformation Sustainability

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Micro-macro regulating heterogeneous interface engineering in 3D N-doped carbon fiber/MXene/TiO_(2) nano-aerogel for boosting electromagnetic wave absorption

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Nano Research 2025年第2期18卷 843-857页

作者： Ying Li Chunlei Dong Sijia Wang Dongyi Lei Binbin Yin Yifei Cui Yanru Wang Ran Li School of Civil Engineering Qingdao University of TechnologyQingdao 266033China Cooperative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone Qingdao University of TechnologyQingdao 266033China Department of Architecture and Civil Engineering City University of Hong KongHong Kong 999077China

MXene,as a rising star among two-dimensional(2D)electromagnetic wave materials,faces urgent challenges in addressing its self-stacking issue and regulating its ***,a micro-macro collaborative design strategy was proposed to regulate heterogeneous interface engineering in MXene-based ***-based cotton was introduced as three dimensional(3D)framework for constructing a porous structure,TiO_(2) was in-situ generated and nitrogen atom was doped on Ti_(3)C_(2)T_(x) MXene to regulate its dielectric properties,a 3D N-doped carbon fiber/MXene/TiO_(2)(CMT)nano-aerogel was successful *** synergistic effects of diverse components and structural designs,porous frameworks and TiO_(2) lattice contraction can significantly adjust the density of the conductive network and create abundant heterogeneous interfaces,as well as the lattice defects induced by nitrogen atom doping can enhance polarization loss,ultimately leading to the excellent microwave absorption performance of 3D N-CMT *** optimized N-CMT 30%aerogel exhibited a minimum reflection loss(RLmin)of−72.56 dB and an effective absorption bandwidth(EAB)of 6.92 GHz at 2.23 ***,when the thickness was adjusted from 1 to 5 mm,the EAB of the N-CMT 30%aerogel reached 13.94 GHz,achieving coverage of 98% of the C-band and the entire X and Ku ***,the attenuation capabilities of the N-CMT aerogel were further confirmed through RCS simulations,whose RCS reduction value reaches up to 19.969 dB·m^(2).These results demonstrate that 3D N-CMT nano-aerogel relying on interface engineering design exhibits significant potential in the field of electromagnetic protection,providing an important reference for future efficient absorbers.

关键词： interface engineering electromagnetic wave absorption MXene micro-macro design nano-aerogel

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