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| 1 | Meso-scale modeling of chloride diffusion in concrete with consideration of effects of time and temperature显示文摘A meso-scale truss network model was developed to predict chloride diffusion in concrete. The model regards concrete as a three-phase composite of mortar matrix, coarse aggregates, and the interfacial transition zone (ITZ) between the mortar matrix and the aggregates. The diffusion coefficient of chloride in the mortar and the ITZ can be analytically determined with only the water-to-cement ratio and volume fraction of fine aggregates. Fick’s second law of diffusion was used as the governing equation for chloride diffusion in a homogenous medium (e.g., mortar); it was discretized and applied to the truss network model. The solution procedure of the truss network model based on the diffusion law and the meso-scale composite structure of concrete is outlined. Additionally, the dependence of the diffusion coefficient of chloride in the mortar and the ITZ on exposure duration and temperature is taken into account to illustrate their effect on chloride diffusion coefficient. The numerical results show that the exposure duration and environmental temperature play important roles in the diffusion rate of chloride ions in concrete. It is also concluded that the meso-scale truss network model can be applied to chloride transport analysis of damaged (or cracked) concrete. | Li-cheng WANG Tamon UEDA | 2009 | Water Science and Engineering2009，2，3： | 3 |
| 2 | Mesoscopic of failure of mortar and concrete by 2D RBSM显示文摘 | NAGAI Kohei SATO Yasuhiko UEDA Tamon | 2004 | Journal of Advanced Concrete Technology2004，2，3： | 1 |
| 3 | Stress- Strain Relationship of Frost-Damaged Concrete Subjected to Fatigue Loading显示文摘 | Muttaqin Hasan Tamon Ueda Yasuhiko Sato | 2008 | Journal of Materials in Civil Engineering2008，，1： | 1 |
| 4 | Mesoscale Simulation of In uence of Frost Damage on Mechanical Properties of Concrete显示文摘 | Tamon Ueda Muttaqin Hasan Kohei Nagai | 2009 | Journal of Materials in Civil Engineering2009，，6： | 1 |
| 5 | Mesoscopic simulation of failure of mortar and concrete by 2D RBSM显示文摘 | YASUHIKO Sato TAMON Ueda | 2004 | J of Adv Concr Technol2004，2，3： | 1 |
| 6 | Mesoscopic simulation of failure of mortar and concrete by 2D RBSM显示文摘 | Kohei Nagai Yasuhiko Sato Tamon Ueda | 2004 | Journal of Advanced Concrete Technology2004，2，3： | 1 |
| 7 | Interface Bond Between FRP Sheets and Concrete Substrates:Properties,Numerical Modeling and Roles in Member Behaviour显示文摘 | Tamon Ueda Dai Jianguo | 2005 | Prog Struct Engng Mater2005，，7： | 1 |
| 8 | Stressstrain relationship of frost-damaged concrete subjec-ted to fatigue loading显示文摘 | Muttaqin Hasan Tamon Ueda Yasuhiko Sato | 2008 | Journal of Materials inCivil Engineering2008，20，1： | 1 |
| 9 | Mesoscopic of failure of mortar and concrete by 2D RBSM显示文摘 | KOHEI Nagai YASUHIKO Sato TAMON Ueda | 2004 | Journal of Advanced Concrete Technology2004，2，3： | 1 |
| 10 | Experimental investigation on shear strength of bolt anchorage group 显示文摘 | Tamon Ueda Boonchai Stitmannaithum | 1991 | ACI Structural Journal1991，56，： | 1 |
| 11 | Study on behavior in tension of reinforced concrete members strengthened by carbon fiber sheets 显示文摘 | Tamon Ueda Ryuichi Yamaguchi Kazuteru Shoji Yasuhiko Sato | 2002 | Journal of Composites for Construction2002，6，3： | 1 |
| 12 | 浸水环境下FRP-混凝土界面剪切黏结性能研究显示文摘采用单搭接头剪切试验比较FRP-混凝土界面使用不同树脂黏结剂在不同浸水时长下的剪切黏结强度、破坏模式、剪切断裂能、黏结滑移曲线等黏结特性。最大6个月的20℃浸水试验表明,采用多乙烯多胺混合硬化树脂的界面黏结强度降低了11%~14%,采用多胺硬化树脂的界面黏结强度降低了2%~10%,黏结层断裂能和局部最大剪应力也有所降低。浸水后的界面破坏模式由浸水前的混凝土黏聚层转移为界面黏着层,这表明浸水条件下界面黏着力降低。同时,树脂黏结材料的材料试验结果表明,树脂本身的抗拉强度在浸水6个月后有所提升,而剪切黏结强度只有微小降低。局部黏结滑移关系的计算结果表明浸水后最大局部剪切应力有所降低,同时界面的平均剪切断裂能降低26%。 | 张大伟 金伟良 Justin Shrestha Ueda Tamon | 2013 | 施工技术2013，42，10： | 1 |
| 13 | Material Mechanical Properties Necessary for the Structural Intervention of Concrete Structures显示文摘Structural intervention involves the restoration and/or upgrading of the mechanical performances of structures. In addition to concrete and steel, which are typical materials for concrete structures, various ber-reinforced polymers (FRPs), cementitious materials with bers, polymers, and adhesives are often applied for structural intervention. In order to predict structural performance, it is necessary to develop a generic method that is applicable to not only to steel, but also to other materials. Such a generic model could provide information on the mechanical properties required to improve the structural performance. External bonding, which is a typical scheme for structural intervention, is not applied for new structures. It is necessary to clarify material properties and structural details in order to achieve better bonding strength at the interface between the substrate concrete and an externally bonded material. This paper presents the mechanical properties of substrate concrete and relevant intervention material for the fol- lowing purposes: ① to achieve better shear strength and ultimate deformation of a member after struc- tural intervention;and ② to achieve better debonding strength for external bonding. This paper concludes that some of the mechanical properties and structural details for intervention materials that are necessary for improvement in mechanical performance in structures with structural intervention are new, and differ from those of structures without intervention. For example, high strength and stiff- ness are important properties for materials in structures without structural intervention, whereas high fracturing strain and low stiffness are important properties for structural intervention materials. | Tamon Ueda | 2019 | Engineering2019，5，6： | 0 |
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