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A novel and promising engineering application of carbon dots:Enhancing the chloride binding performance of cement

Chinese Chemical Letters 2024年第6期35卷 409-416页

作者： Wu-Jian Long Yang Yu Chuang He guangdong provincial key laboratory of durability for Marine civil engineering Key Lab of Coastal Urban Resilient InfrastructureMOECollege of Civil and Transportation EngineeringShenzhen UniversityShenzhen 518060China

Corrosion of reinforcement induced by chloride invasion is extensively considered as the dominating deterioration mechanism of reinforced concrete(RC)structures,leading to serious safety hazards and tremendous economic ***,it still lacks well dispersive and cost-efficient nanomaterials to improve the anti-chloride-corrosion ability of RC ***,specific carbon dots(CDs)with high dispersity and low cost are deliberately designed,successfully prepared by hydrothermal processing,and then firstly applied to immensely enhance chloride binding performance of cement,thereby contributing to suppressing the corrosion of ***,the tailored CDs are composed of the carbon core with highly crystalline sp^(2)C structures and oxygen-containing groups connecting on the carbon core;The typical equilibrium test confirms that with respect to that of the blank cement paste,the chloride binding capacity of cement paste involving 0.2 wt%(by weight of cement)CDs is increased by 109% after 14-day exposure to 3 mol/L Na Cl solution;according to comprehensive analyses of phase compositions,the chloride binding mechanism of CDs-modified cement is rationally attributed to the fact that the incorporation of CDs advances the formation of calcium silicate hydrate(C-S-H)gels and Friedel's salt(Fs),thus enormously enhancing the physically adsorbed and chemically bound chloride ions of cement *** work not only firstly provides a novel high-dispersity and low-cost nanomaterial toward the durability enhancement of RC structures,but also broadens the application of CDs in the field of engineering,conducing to stimulating their industrialization development.

关键词： Carbon dots Chloride binding Cement Chloride binding mechanism Friedel’s salt

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Simplified design of nonlinear damper parameters and seismic responses for long-span cable-stayed bridges with nonlinear viscous dampers

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Frontiers of Structural and civil engineering 2024年第7期18卷 1103-1116页

作者： Huihui LI Lifeng LI Rui HU Meng YE College of civil and Transportation engineering Shenzhen UniversityShenzhen 518060China guangdong provincial key laboratory of durability for Marine civil engineering Shenzhen UniversityShenzhen 518060China College of civil engineering Hunan UniversityChangsha 410082China

Viscous dampers are widely used as passive energy dissipation devices for long-span cable-stayed bridges for mitigation of seismic load-induced ***,complicated finite element(FE)modeling,together with repetitive and computationally intensive nonlinear time-history analyses(NTHAs)are generally required in conventional design *** streamline the preliminary design process,this paper developed a simplified longitudinal double degree of freedom model(DDFM)for single and symmetric twin-tower cable-stayed *** on the proposed simplified longitudinal DDFM,the analytical equations for the relevant mass-and stiffness-related parameters and longitudinal natural frequencies of the structure were derived by using analytical and energy *** of the relationship between the nonlinear viscous damper parameters and the equivalent damping ratio was achieved through the equivalent linearization ***,the analytical equations of longitudinal seismic responses for long-span cable-stayed bridges with nonlinear viscous dampers were *** on the developed simplified DDFM and suggested analytical equations,this paper proposed a simplified calculation framework to achieve a simplified design method of nonlinear viscous damper ***,the effectiveness and applicability of the developed simplified longitudinal DDFM and the proposed calculation framework were further validated through numerical analysis of a practical cable-stayed ***,the results indicated the following.1)For the obtained fundamental period and longitudinal stiffness,the differences between results of the simplified longitudinal DDFM and numerical analysis were only 2.05%and 1.5%,respectively.2)Relative calculation errors of the longitudinal girder-end displacement and bending moment of the bottom tower section of the bridge obtained from the simplified longitudinal DDFM were limited to less than 25%.3)The equivalent damping ratio of nonline

关键词： cable-stayed bridges viscous dampers simplified analytical model equivalent damping ratio seismic mitigation

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Investigation of Maxima Assumptions in Modelling Tropical Cyclone- Induced Hazards in the South China Sea

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China ocean engineering 2024年第3期38卷 491-504页

作者： WEN Ze-guo WANG Fu-ming WAN Jing YANG Fan School of civil engineering Sun Yat-sen University&Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Zhuhai 519082China guangdong Academy of Safety Science and Technology Guangzhou 510060China guangdong key laboratory of oceanic civil engineering Guangzhou 510275China Advanced Energy Science and Technology guangdong laboratory(Yangjiang Offshore Wind Energy laboratory) Yangjiang 529500China

The present study aims to examine the suitability of two commonly used assumptions that simplify modelling metoceanconditions for designing offshore wind turbines in the South China Sea (SCS). The first assumption assumes thatjoint N-year extreme wind and wave events can be independently estimated and subsequently combined. The secondone assumes peak wind and waves can be modelled as occurring simultaneously during a tropical cyclone (TC) *** better understand the potential TC activity, a set of 10000 years synthetic TC events are generated. The wind fieldmodel and the Mike 21 spectral wave model are employed to model the TC-induced hazards. Subsequently, theeffect of the assumptions is evaluated by analyzing the peak structural response of both monopile and semisubmersibleoffshore wind turbines during TC events. The results demonstrate that the examined assumptions are generally *** assessing the implications of these assumptions, valuable insights are obtained, which can inform andimprove the modelling of TC-induced hazards in the SCS region.

关键词： tropical cyclone numerical wave modelling hazards offshore wind turbines structural response

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Exploring the Predominant Factors Influencing the Oxygen Reduction Performance of PtCo/C Catalysts

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Chemical Research in Chinese Universities 2024年第4期40卷 753-760页

作者： LI Jinrong YU Xianghui SUN Qi PENG Yong CAO Shuang HOU Chun-Chao XU Qiang College of Chemistry and Chemical engineering Institute for Sustainable Energy and ResourcesQingdao UniversityQingdao266071P.R.China Leibniz Institute for Catalysis e.V. Albert-Einstein-Strasse 29aRostock18059Germany School of Materials Science and engineering Ocean University of ChinaQingdao266100P.R.China Shenzhen key laboratory of Micro/Nano-Porous Functional Materials(SKLPM) SUSTech-Kyoto University Advanced Energy Materials Joint Innovation Laboratory(SKAEM-JIL)Key University Laboratory of Highly Efficient Utilization of Solar Energy and Sustainable Development of GuangdongDepartment of Chemistry and Department of Materials Science and EngineeringSouthern University of Science and Technology(SUSTech)Shenzhen518055P.R.China

PtCo nanoalloys(NAs)deposited on carbon black are emerging as robust electrocatalysts for addressing the sluggish kinetic issue of oxygen reduction reaction(ORR).However,developing a simple and low-cost method to synthesize PtCo/C with excellent performance is still a great *** this work,a one-pot method was used to successfully obtain the PtCo NAs on commercial carbon supports of acetylene black and Ketjenblack ECP600JD,*** with those grown on Ketjenblack ECP600JD,the PtCo NAs grown on acetylene black exhibited higher electrochemical surface area(ECSA)and mass activity(MA),which may be attributed to the different particle sizes of PtCo NAs,distinct hydrophilicity,electroconductivity and charge distribution between the carbon supports and PtCo *** study provides valuable insights into the optimal design of carbon-supported ORR electrocatalysts with exceptional activity and durability.

关键词： Oxygen reduction reaction PtCo nanoalloy Carbon-supported nanostructure Acetylene black

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Performance evaluation of new epoxy resin-based composite phase change materials and their asphalt mixture

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Journal of Traffic and Transportation engineering(English Edition) 2024年第3期11卷 507-522页

作者： Yuchao Gao Jiao Jin Shuai Liu Yinfei Du Guoping Qian Jie Mao Yongqiang Zhu School of Traffic and Transportation engineering Changsha University of Science and TechnologyChangsha 410114China School of civil engineering Central South UniversityChangsha 410075China guangdong Guanyue Highway and Bridge Co. Ltd.Guangzhou 511452China

In recent years,the temperature-adjusted asphalt pavement has been an extensive concern by scholars in various countries,and this pavement can reduce temperaturerelated *** this study,the shaped composite phase change materials(CPCMs)were successfully synthesized by two processes,which are vacuum impregnation and epoxy ***,the applicability of CPCMs in asphalt mixtures was evaluated by microscopic characterization,chemical compatibility,thermal properties,durability,and leakage ***,CPCMs were applied to the asphalt mixture to evaluate its temperatureadjusted characteristics and pavement ***,the performance of the temperature-adjusted asphalt mixture was analyzed by integrating all *** research shows that the prepared CPCMs have excellent thermal properties and durability,the phase transition temperature is 48.93℃,and the phase transition enthalpy is 106.5 J/g,which fully meets the requirements for use in *** temperature-adjusted asphalt mixture could alleviate the occurrence of extreme temperature,which was 4.9℃lower than the conventional *** pavement performance of the temperatureadjusted asphalt mixture can meet the specified standards for humid *** the factors,the recommended amount of CPCMs is 1.5%.The research results provide a basis for the promotion of temperature-adjusted asphalt pavement and effectively support the development of pavement engineering technology.

关键词： Pavement engineering Temperature-adjusted asphalt mixture Phase change materials Thermal performance

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Analytical Modeling for Corrosion-Induced Cover Cracking of Corrosive Reinforced Concrete Structures

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Transactions of Tianjin University 2012年第4期18卷 285-290页

作者：张小刚王娇周英武 guangdong provincial key laboratory of durability for Marine civil engineering College of Civil EngineeringShenzhen University

An analytical model for predicting the corrosion-induced cracking of concrete cover of reinforced concrete(RC) structures was *** effects of influence factors such as practical initial defects,corrosion rate,strength and elastic modulus of concrete on the corrosion-induced cracking of concrete cover were *** was found that the size of practical initial defects was the most effective ***,improving the compactness of concrete is an effective way to improve the durability of RC *** was also demonstrated that the accelerated corrosion tests may be unfavorable in the study of the relationship between cracking time and crack width.

关键词： initial crack width corrosion-induced cracking RC structure analytical model

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Chemical Modifications of Layered Double Hydroxides in the Supercapacitor

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Energy & Environmental Materials 2020年第3期3卷 346-379页

作者： Chuan Jing Biqin Dong Yuxin Zhang State key laboratory of Mechanical Transmissions College of Materials Science and EngineeringChongqing UniversityChongqing 400044China guangdong provincial key laboratory of durability for Marine civil engineering Shenzhen UniversityShenzhen 518060China

Layered double hydroxides are one class or kind of 2 D layered materials that are considered promising for use in the *** there have been many studies on the structure,composition,properties,and electrode fabrication of layered double hydroxides,none summarize the effects of various modification methods on the structure and performance of layered double hydroxides in the *** a bid to fill this gap,in this review,we summarize the progress of modification methods such as exfoliation,intercalation,vacancy,doping,phase transformation,and composition regulation of layered double hydroxides in the field of the supercapacitor and put forward some opinions regarding the progress of research on the methods used in modifying the layered double hydroxides.

关键词： 2D materials chemical modifications layered double hydroxide supercapacitor

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Fused structures for safer and more economical constructions

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Frontiers of Structural and civil engineering 2020年第1期14卷 1-9页

作者： Yu-Fei WU Ying-Wu ZHOU Biao HU Xiaoxu HUANG Scott SMITH School of engineering RMIT UniversityMelbourneVIC 3001Australia guangdong provincial key laboratory of durability for Marine civil engineering Shenzhen UniversityShenzhen 518061China School of civil Environmental and Mining EngineeringThe University of AdelaideSouth Australia 5005Australia

Safety margin and construction costs are two conflicting goals for a *** providing a fuse in a structure that is triggered at a certain level of over-loading,further increase of loading is prohibited and failure of the structure is changed to a safer *** overloading is controlled and a safer failure mode is enforced,a fused structure requires a smaller safety factor thus leading to more economical construction without compromising *** use of a fuse will also facilitate safer use of advanced construction materials such as fiber-reinforced polymer(FRP)*** this case,a fuse can transfer the sudden and dangerous failure mode associated with brittle FRP debonding or rupture to a safe and ductile failure mode at the fuse *** paper introduces a new type of fused structure as well as an associated design philosophy and approach,in addition to examples of engineering applications.

关键词： fused structures structural fuse fiber-reinforced polymer concrete

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Modeling the Synergetic Effect of Various Factors on Chloride Transport in Nonsaturated Concrete

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Journal of Wuhan University of Technology(Materials Science) 2016年第6期31卷 1336-1346页

作者：张小刚 LU Zhaohui 王淑萍 ZHOU Tianhai XING Feng guangdong provincial key laboratory of durability for Marine civil engineering College of Civil Engineering Shenzhen University Shenzhen 518060 China National engineering laboratory for High Speed Railway Construction School of Civil Engineering Central South University Changsha 410075 China College of Materials Science and engineering Chongqing University Chongqing 400045 China

Diffusion has been systematically described as the main mechanism of chloride transport in reinforced concrete（RC） structure, especially when the concrete is in a saturated state. However, the single mechanism of diffusion is not able to describe the actual chloride ingress in the nonsaturated concrete. Instead, it is dominated by the interaction of diffusion and convection. With the synergetic effects of various factors taken into account, this study aimed to modify and develop an analytical convection- diffusion coupling model for chloride transport in nonsaturated concrete. The model was verified by simulation of laboratory tests and field measurement. The results of comparison study demonstrate that the analytical model developed in this study is efficient and accurate in predicting the chloride profiles in the nonsaturated concrete.

关键词： RC structures nonsaturated concrete chloride transport synergetic effect analytical convection-diffusion model influence factors

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Development of limestone calcined clay cement concrete in South China and its bond behavior with steel reinforcement

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Journal of Zhejiang University-Science A(Applied Physics & engineering) 2020年第11期21卷 892-907页

作者： Zhen-yu HUANG You-shuo HUANG Wen-yu LIAO Ning-xu HAN Ying-wu ZHOU Feng XING Tong-bo SUI Bin WANG Hong-yan MA guangdong provincial key laboratory of durability for Marine civil engineering Shenzhen UniversityShenzhen 518060China Department of civil Architectural and Environmental EngineeringMissouri University of Science and TechnologyRollaMO 65401USA Si noma Research Institute Si noma International Engineering Co.Ltd.Beijing 100102China

Limestone calcined clay cement(LC^3),consisting of ordinary Portland cement(OPC)clinker,calcined clay,limestone powder,and gypsum,has been considered a promising solution to current challenges in the cement and concrete industry,such as high carbon emissions,high energy consumption,and resource *** study carries out a series of experimental investigations of LC^3-based paste,mortar,and concrete,including microstructural analyses(*** product characterization and pore structure analysis)and macro-scale testing(*** and mechanical properties),using raw materials from south *** results show that,in LC^3 paste,the replacement of clinker by calcined clay and limestone leads to an increased volume of small pores but decreased total volume of *** workability of LC^3 mortar and concrete can be readily tailored using conventional *** designed for comparable 28-d compressive strength,the LC^3 mortar and concrete tend to have lower early-age compressive strength,but comparable compressive strength and higher flexural strength than those of the OPC counterparts at late *** study also examines the bond-slip behavior between LC^3 concrete and steel bars and finds that the bond strength is comparable to that of OPC concrete with the same 28-d compressive strength,but that the LC^3 concrete-rebar interface exhibits higher bond-slip *** findings on LC^3 concrete provide fundamental information and guidance for furthering the application of LC^3 binder in structural concrete in the near future.

关键词： Limestone calcined clay cement(LC^3) Hydration Bond-slip Mercury intrusion porosimetry(MIP) Scanning electron microscope(SEM) Bond strength

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