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On the added value of multi-scale modeling of concrete

Frontiers of Structural and Civil Engineering 2022年第1期16卷 1-23页

作者： Jiaolong ZHANG eva binder Hui WANG Mehdi AMINBAGHAI Bernhard LA PICHLER Yong YUAN Herbert A MANG College of Civil Engineering Tongji UniversityShanghai 200092China Department of Building Technology Linnaeus UniversityVaxjo 35195Sweden School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China Institute for Mechanics of Materials and Structures TU WienVienna 1040Austria

This review of the added value of multi-scale modeling of concrete is based on three representative *** first one is concerned with the analysis of experimental data,taken from four high-dynamic *** structural nature of the high-dynamic strength increase can be explained by using a multi-scale *** accounts for the microstructure of the *** second example refers to multi-scale thermoelastic analysis of concrete pavements,subjected to solar heating.A sensitivity analysis with respect to the internal relative humidity(RH)of concrete has underlined the great importance of the RH for an assessment of the risk of microcracking of *** third example deals with multi-scale structural analysis of a real-scale test of a segmental tunnel *** has turned out that multi-scale modeling of concrete enables more reliable predictions of crack opening displacements in tunnel segments than macroscopic models taken from codes of ***,it is concluded that multi-scale models have indeed a significant added ***,its degree varies with these *** any case,it can be assessed by means of a comparison of the results from three sources,namely,multi-scale structural analysis,conventional structural analysis,and experiments.

关键词： experiments multi-scale analysis conventional structural analysis concrete reinforced concrete

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Multiscale structural analysis inspired by exceptional load cases concerning the immersed tunnel of the Hong Kong-Zhuhai-Macao Bridge

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Underground Space 2018年第4期3卷 252-267页

作者： Hui Wang eva binder Herbert Mang Yong Yuan Bernhard Pichler Institute for Mechanics of Materials and Structures TU Wien–Vienna University of TechnologyKarlsplatz 13/202A-1040 ViennaAustria College of Civil Engineering Tongji UniversityShanghaiChina

This paper contains an assessment of the added value of multiscale material models for concrete in the context of macroscopic struc-tural analysis of(steel-reinforced)concrete *** examples are *** are inspired by the possibility of car accidents inside the immersed tunnel of the Hong Kong-Zhuhai-Macao Bridge(HZMB).The first example deals with vehicles crashing into the tunnel *** high-dynamic strengthening effect of concrete is studied based on an engineering mechanics *** structural nature of the dynamic strength increase factor(DIF)is demonstrated by means of high-dynamic strength values measured on mortar cylinders of different ***,the evolution of the DIF as a function of hardening of concrete at material ages beyond 28 days is studied.A validated multiscale model for concrete renders a customized analysis for the specific concrete used for the aforementioned tunnel *** is found that the DIF decreases with progressive hardening of concrete at material ages beyond 28 *** second example is inspired by tunnel fires as may happen after car *** study refers to thermal stresses in steel-reinforced concrete beams sub-jected to sudden *** thermal expansion coefficient of the concrete of the tunnel is quantified by means of a multiscale *** is used as input for linear thermo-mechanical Finite-Element simulations of steel-reinforced concrete *** essential macroscopic simulation results are temperature distributions and associated stress *** are employed for top-down quantification of micro-scopic stress states inside the cement paste and the *** allows for quantifying two sources of microstructural stress fluctu-ations:(i)the macro-to-micro stress concentration and(ii)the mismatch of microscopic thermal expansion *** both examples,the multiscale models for concrete have increased the informative content of the structural simulations.

关键词： Concrete linings High-dynamic strength Thermal stresses

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霉菌毒素对家禽免疫系统的影响

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中国家禽 2001年第9期23卷 35-36页

作者：陈勇张慧玲周光宏 eva Maria binder 南京农业大学动物科技学院南京210095

1黄曲霉毒素B1(Aflatoxin B1)黄曲霉毒素B1(AfB1)是研究得最多的霉菌毒素.它对各种动物的免疫应答反应均产生抑制作用,作用机理尚不十分清楚.

关键词：霉菌毒素家禽免疫系统影响免疫功能抑制作用

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Characterization of Manmade and Recycled Cellulosic Fibers for Their Application in Building Materials

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Journal of Renewable Materials 2019年第11期7卷 1121-1145页

作者： Nadezda Stevulova Viola Hospodarova Adriana Estokova eva Singovszka Marian Holub Stefan Demcak Jaroslav Briancin Anton Geffert Frantisek Kacik Vojtech Vaclavik Tomas Dvorsky Technical University of Kosice Faculty of Civil EngineeringInstitute of Environmental EngineeringVysokoskolska 404200 KosiceSlovakia Institute of Geotechnics of the Slovak Academy of Sciences Watsonova 4504353 KosiceSlovakia Technical University in Zvolen Faculty of Wood Sciences and TechnologyDepartment of Chemistry and Chemical TechnologiesT.G.Masaryka 2117/2496053 ZvolenSlovakia VSB-Technical University of Ostrava Faculty of Mining and GeologyDepartment of Environmental Engineering17.listopadu 15/217270833 Ostrava-PorubaCzech Republic

The aim of this study was to characterize two types of cellulosic fibers obtained from bleached wood pulp and unbleached recycled waste paper with different cellulose content(from 47.4 percent up to 82 percent),to compare and to analyze the potential use of the recycled fibers for building application,such as plastering *** in the chemical composition,cellulose crystallinity and degree of polymerization of the fibers were *** recycled fibers of lower quality showed heterogeneity in the fiber sizes(width and length),and they had greater surface roughness in comparison to high purity wood pulp *** high purity fibers(cellulose content>80.0 percent)had greater crystallinity and more homogeneous and smooth surfaces than the recycled *** presence of calcite and kaolinite in all of the recycled cellulosic fibers samples was confirmed,whereas only one wood pulp sample contained *** influence of the chemical composition was reflected in the fiber density *** in the chemical composition and cellulose structure of the fibers affected the specific surface area,porosity and thermo physical properties of the *** favorable values of thermal conductivity were reached for the recycled fibers than for the wood pulp *** the suitability of the recycled fibers with inorganic impurities originating from the paper-making processes for their use as fillers in plastering mortars(0.5 wt.%fiber content of the total weight of the filler and binder)confirmed their application by achieving a compressive strength value of 28 day-cured fiber-cement mortar required by the standard as well as by measured more favorable value of capillary water absorption coefficient.

关键词： Wood pulp waste paper fiber properties characterization compressive strength of mortars

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