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您的检索式：作者名="LONG GuangCheng"
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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 | Self-compacting concrete reinforced by waste tyre rubber particle and emulsified asphalt显示文摘 | Long Guangcheng Ma Kunlin Zhe Li | 2012 | Sustainable Construction Materials2012，，144： | 1 |
| 4 | Very-high- performance concrete with ultrafine powders 显示文摘 | Long Guangcheng Wang Xinyou Xie Youjun | 2002 | Cem Concr Rcs2002，32，4： | 1 |
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