| Co-Investigator(Kenkyū-buntansha) |
CHAUBE Rajesh P. Univ.of Tokyo, Dept.of Civil Eng.Assis.Prof., 大学院・工学系研究科, 講師
SHIMOMURA Takumi Nagaoka Univ.of Technology, Dept.of Civil and Environm., Assoc.Prof., 工学部, 助教授 (40242002)
MAEKAWA Koichi Univ.of Tokyo.Dept.of Civil Eng., Prof., 大学院・工学系研究科, 教授 (80157122)
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| Research Abstract |
The objective of this research is to seek for a so called life-span simulator of structural concrete. For this purpose, experiment, verification and analytical modeling were carried out at each stage.
(1) To predict the flow behavior of flesh concrete, a theoretical model was established on a basis of energy, dissipated out of the system and shear stress formulation through random particle collisions. In this model, flesh concrete consists of paste, fine and coarse aggregate.
(2) We developed an analytical model which can predict the water content in concrete under generic drying-wetting conditions, considering the geometric characteristics of pores and thermodynamic equilibrium. Furthermore, by modeling random micropore structures and viscosity of pore water, the gas and liquid permeability of concrete can be predicted under various conditions.
(3) A nonlinear analytical system, which considers the inter-relationship between hydration, micro-pore structure development and moisture transp
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ort, was established. As a result, the material properties of young aged concrete can be well predicted for arbitrary environmental and initial conditions.
(4) We proposed an autogenous and drying shrinkage model based on micro mechanical physics. For predicting the deformation of concrete under continuous stress, a creep model was also established. By implementing these model to the nonlinear analytical system (3), the volumetric change of concrete can be predicted for various conditions.
(5) We presented an integrated computational system of 3D FE structural analysis program, and 3D FE thermo-hygro physical analysis (3). This proposed integrated system can be used for simultaneous evaluation of the total structural and material performances without distinguishing between structural and durability.
(6) An analytical model to predict the chloride ion transport and corrosion in concrete was developed. Furthermore, the prediction method of bending capacity of deteriorated concrete due to corrosion was also studied. Less
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