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Unraveling the Stray Current-Induced Interfacial Transition Zone(ITZ)Effect on Sulfate Corrosion in Concrete

Engineering 2024年第10期41卷 130-152页

作者： Yong-Qing Chen Lin-Ya Liu Da-Wei Huang Qing-Song Feng Ren-Peng Chen Xin Kang School of Transportation Engineering East China Jiaotong UniversityNanchang 330013China College of Civil Engineering Hunan UniversityChangsha 410082China Key Laboratory of Building Safety and Energy Efficiency of Ministry of Education&National Center for International Research Collaboration in Building Safety and Environment Hunan UniversityChangsha 410082China

The rail transit in sulfate-rich areas faces the combined effects of stray current and salt corrosion;however,the sulfate ion transport and concrete degradation mechanisms under such conditions are still *** address this issue,novel sulfate transport and mesoscale splitting tests were designed,with a focus on considering the differences between the interfacial transition zone(ITZ)and cement *** the influence of stray current,the ITZ played a pivotal role in regulating the transport and mechanical failure processes of sulfate attack,while the tortuous and blocking effects of aggregates almost *** phenomenon was termed the“stray current-induced ITZ effect.”The experimental data revealed that the difference in sulfate ion transport attributed to the ITZ ranged from 1.90 to 2.31 times,while the difference in splitting strength ranged from 1.56 to 1.64 *** the real-time synchronization of splitting experiments and microsecond-responsive particle image velocimetry(PIV)technology,the mechanical properties were exposed to the consequences of the stray currentinduced ITZ *** number of splitting cracks in the concrete increased,rather than along the central axis,which was significantly different from the conditions without stray current and the ideal Brazilian disk ***,a sulfate ion mass transfer model that incorporates reactivity and electrodiffusion was meticulously *** embedded finite element calculation exhibited excellent agreement with the experimental results,indicating its reliability and ***,the stress field was determined utilizing analytical methods,and the mechanism underlying crack propagation was successfully *** to the cement matrix,a stray current led to more sulfates,more microstructure degradation,and greater increases in thickness and porosity in the ITZ,which was considered to be the essence of the stray current-induced ITZ effect.

关键词： Interfacial transition zone(ITZ)effect Stray current Sulfate attack Transport mechanism splitting test Microstructure

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Tensile strength of sea ice using splitting tests based on the digital image correlation method

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Advances in Polar Science 2021年第4期32卷 374-381页

作者： CHEN Xiaodong HE Shuaikang HE Wenquan WANG Zhaoyu JI Shunying State Key Laboratory of Structure Analysis of Industrial Equipment Dalian University of TechnologyDalian 116023China DUT-BSU Joint Institute Dalian University of TechnologyDalian 116023China Marine Environmental Forecasting Station of Yingkou Yingkou 115007China Marine Monitoring and Early Warning Center of Liaoning Shenyang 110001China

The splitting test is a competitive alternative method to study the tensile strength of sea ice owing to its suitability for ***,the approach was questioned to the neglect of local plastic deformation during the *** this study,splitting tests were performed on sea ice,with 32 samples subjected to the regular procedure and 8 samples subjected to the digital image correlation *** salinity,density,and temperature were measured to determine the total *** the advantage of the digital image correlation method,the full-field deformation of the ice samples could be *** the loading direction,the samples mainly deformed at the ice-platen contact *** the direction vertical to the loading,deformation appears along the central line where the splitting crack *** on the distribution of the sample deformation,a modified solution was derived to calculate the tensile strength with the maximum *** on the modified solution,the tensile strength was further calculated together with the splitting test *** results show that the tensile strength has a negative correlation with the total porosity,which agrees with previous studies based on uniaxial tension tests.

关键词： tensile strength splitting test digital image correlation method ice mechanics sea ice

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Complete splitting process of steel fiber reinforced concrete at intermediate strain rate

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Journal of Central South University of Technology 2008年第4期15卷 569-573页

作者：罗章李夕兵赵伏军 Department of Architectural Engineering Hunan Institute of Engineering School of Resources and Safety Engineering Central South University School of Energy and Safety Engineering Hunan University of Sciences and Technology

The complete splitting process of steel fiber reinforced concrete （SFRC） at intermediate strain rate was studied by experiment. The basic information of a self-developed SFRC dynamic test system matching with lnstron 1342 materials testing machine was given, and the experiment principle and the loading mode of cubic split specimen were introduced. During the experiment, 30 cubes of 150 mm×150 mm×150 mm and 36 cubes of 100 mm×100 mm×100 mm, designed and prepared according to C20 class SFRC with different volume fractions of steel fiber （0, 1%, 2%, 3%, 4%） were tested and analyzed. At the same time, the size effect of SFRC at intermediate strain rate was investigated. The experimental study indicates that SFRC size effect is not influenced by the loading speed or strain rate. When the steel fiber content increases from 0 to 4%, the splitting strength of SFRC increases from 100% to 261%, i.e. increasing by 161% compared with that of the common concrete. The loading rate increases from 1.33 kN/s to 80.00 kN/s, and the splitting tensile strength increases by 43.55%.

关键词： steel fiber reinforced concrete intermediate strain rate splitting test size effect

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