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| 1 | Experimental investigation on dynamic mechanical characteristics and microstructure of steam-cured concrete显示文摘Steam-cured concrete is widely used to manufacture prefabricated units of high-speed railway foundation structure such as girder and track slab.The dynamic mechanical property of steam-cured concrete is one of the key properties affecting service performance of high-speed railway foundation structure.In the present paper,serial macro/micro-experiments were carried out to investigate the dynamic elastic modulus,shear modulus,damping ratio,and microstructure of steam-cured concrete.The relationships between compositions,curing regime,microstructure,and dynamic properties of steam-cured concrete as well as the corresponding mechanisms were discussed.The results indicate that steam-cured concrete in early age has a larger dynamic elastic modulus and shear modulus as well as a smaller damping ratio compared with standard-cured concrete.On the contrary,at a later age a slightly smaller dynamic elastic modulus and a larger damping ratio of steam-cured concrete are observed.Addition of mineral admixture results in a bit lower dynamic elastic modulus and damping ratio of concrete than that of the control specimen without mineral admixtures.The achievements can provide some fundamental suggestions for materials parameters selection during structural design of steam-cured concrete precast element. | LONG GuangCheng WANG Meng XIE YouJun MA KunLin | 2014 | Science China(Technological Sciences)2014，57，10： | 4 |
| 2 | Deterioration of dynamic mechanical property of concrete with mineral admixtures under fatigue loading显示文摘The dynamic mechanical property of concrete is one of the key parameters,which greatly influences durability of infrastructures subjected to continuous heavy loading,such as girder and track slab of high-speed railway foundation structure.This paper reports serials of experiments designed to investigate the deterioration of dynamic mechanical properties of different concretes under fatigue loading condition.Four parameters including relative dynamic elastic modulus(RDEM),relative dynamic shear modulus(RDSM),relative compressive strength(RCS)and water absorption(WA)of concrete were evaluated to assess the dynamic properties and microstructures of concretes.Results show that the fatigue stress levels and fatigue cycle durations significantly influence the dynamic mechanical properties of concrete including dynamic elastic modulus and dynamic shear modulus.Addition of proper mineral admixture can improve the dynamic mechanical characteristics of concrete and increase its resistance against the fatigue loading effect.Keeping the amount of mineral admixture in concrete constant,its dynamic mechanical property with fly ash is lower than that with fly ash and silica fume.The water absorption in concrete,which is an indirect parameter reflecting capillary porosity,increases evidently after bearing fatigue-loading.There is a close correlation between the deterioration of dynamic mechanical property and the increasing of water absorption of concrete.This indicates that the damage of microstructure of concrete subjected to fatigue loading is the indispensable reason for the decay of its dynamic mechanical performance. | MA KunLin XIE YouJun LONG GuangCheng TAN WenYong | 2014 | Science China(Technological Sciences)2014，57，10： | 2 |
| 3 | Investigation on compounding and application of C80- C100 high-performance concrete 显示文摘 | YIN Jian ZHOU Shiqiong XIE Youjun | 2002 | Cem Concr Res2002，32，2： | 1 |
| 4 | Investigation on compounding and application of C80–C100 high-performance concrete显示文摘 | Jian Yin Shiqiong Zhou Youjun Xie Yu Chen Qinlian Yan | 2002 | Cement and Concrete Research2002，，2： | 1 |
| 5 | Frequencies and mechanisms of pesticide resistance in Tetranychus urticae field populations in China显示文摘The two-spotted spider mite Tetranychus urticate is an important agricultural pest worldwide.It is extremely polyphagous and has developed resistance to many pesticides.Here,we assessed the pesticide resistance of seven field populations of T.urticae in China,their target site mutations and the activities of their detoxification enzymes.The results showed that abamectin and the traditional pesticides pyridaben,profenofos and bifenthrin had higher resistance or lower toxicity than more recently developed pesticides including chlorfenapyr,spinetoram,cyflumetofen,cyenopyrafen,bifenazate and B-azolemiteacrylic.The frequency of point mutations related to abamectin resistance,G314D in the glutamate-gated chloride channel 1(GluCl1)and G326E in GluC13,ranged 47%-70%and 0%-97%,respectively.The frequency of point mutations in A1215D and F1538I of the voltage-gated sodium channel gene(VGSC),which may increase resistance to pyrethroids,ranged 88%-100%and 10%-100%,respectively.For target sites related to organophosphate resistance,mutation frequencies ranged 25%-92%for G119S and 0%-23%for A201S in the acetycholinesterase gene(Ace).Mutation G126S in the bifenazate resistance-related cytochrome b gene(Cytb)was observed in three of the seven T.urticae populations.Higher activities of detoxification enzymes(P450,GST,CarEs and UGTs)were observed in two T.urticae populations,with significant difference in the XY-SX population.These results provide useful information on the status of pesticide resistance of T.urticae in China and suggest that T.urticae field populations may have multiple resistance mechanisms. | Yan Zhang Dandan Xu Youjun Zhang Qingjun Wu Wen Xie Zhaojiang Guo Shaoli Wang | 2022 | Insect Science2022，29，3： | 1 |
| 6 | Development of a hamster kidney cell line expressing stably T7 RNA polymerase using retroviral gene transfer technology for efficient rescue of infectious foot-and-mouth disease virus显示文摘 | Haixue Zheng Hong Tian Ye Jin Jinyan Wu Youjun Shang Shuanghui Yin Xiangtao Liu QingGe Xie | 2008 | Journal of Virological Methods2008，，1： | 1 |
| 7 | A Study of the Mixing of Cement and Emulsified Asphalt Mortar 显示文摘 | Xiaohui Zeng Youjun Xie Dehua Deng | 2013 | Magazine of Concrete Research2013，65，21： | 1 |
| 8 | Volume changes of very-high-performance cement-based composites 显示文摘 | Liang Guangcheng Xie Youjun Jiang Zhengwu | 2006 | Magazine of Concrete Research2006，58，10： | 1 |
| 9 | Optimum mix parameters of high-strength self-compacting concrete with ultrapulverized fly ash显示文摘 | XIE Youjun LIU Baoju YIN Jian | 2002 | Cement and Concrete Research2002，32，3： | 1 |
| 10 | Complete nucleotide sequence of a Chinese serotype Asia1 vaccine strain of foot-and-mouth disease virus显示文摘 | Junzheng Du Huiyun Chang Guozheng Cong Junjun Shao Tong Lin Youjun Shang Zaixin Liu Xiangtao Liu Xuepeng Cai Qingge Xie | 2007 | Virus Genes2007，，3： | 1 |
| 11 | Conductivi- ty behavior of the fresh CA mortar and its relationship with the fluidity properties 显示文摘 | ZENG Xiaohui XIE Youjun DENG Dehua | 2012 | Construction and Build- ing Materials2012，36，3： | 1 |
| 12 | Investigation on com-pounding and application of C80-C100 high -perfoemence concrete 显示文摘 | YIN Jian ZtlOU Shiqiong XIE Youjun etal | 2002 | CemConcr Res2002，32，2： | 1 |
| 13 | Optimum mix parametersofhigh-strength self-compacting concrete with ultrapulverized flyash显示文摘 | Youjun Xie Baoju Liu Jian Yin Shiqiong Zhou | 2002 | Cement and Concrete Research2002，32，3： | 1 |
| 14 | Volume changes of very-high-performance cement-based composites显示文摘 | Liang Guangcheng Xie Youjun Jiang Zhengwu | 2006 | Magazine of Concrete Research2006，58，10： | 1 |
| 15 | Some factors affecting early compressive strength of steam-curing concrete with ultrafine fly ash显示文摘 | Liu Baoju Xie Youjun Zhou Shiqiong | 2001 | Cement and Concrete Research2001，31，10： | 1 |
| 16 | Conductivity behavior of the fresh CA mortar and its relationship with the fluidity properties显示文摘 | ZENG Xiaohui XIE Youjun DENG Dehua | 2012 | Construction and Building Materials2012，36，： | 1 |
| 17 | Influence of ultrafine fly ash composite on the fluidity and compressive strength of concrete显示文摘 | LIU Baoju XIE Youjun ZHOU Shigiong | 2000 | Cem Concr Res2000，30，9： | 1 |
| 18 | Investigation on compounding and application of C80 - C100 high-performance concrete显示文摘 | YIN Jian ZHOU Shiqiong XIE Youjun | 2002 | Cem Concr Res2002，32，2： | 1 |
| 19 | Predictive display and interaction of telerobots based on augmented reality 显示文摘 | Xiong Youjun Li Shiqi Xie Ming | 2006 | Robotica2006，24，1： | 1 |
| 20 | Investigation on compounding and application of C80 ~ C100 high- performance concrete 显示文摘 | Jian Yin Shiqiong Zhou Youjun Xie | 2002 | Cement Concrete Research2002，，32： | 1 |
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