Development of control method about micro crack localization for restrained volume change which occurred by simultaneous movement of moisture and heat in RC structure

考虑到混凝土干燥时的水分蒸发和热扩散，本研究从水和热的同时运动来考察伴随这些环境的体积变化所产生的裂缝模式。此外，通过拉伸蠕变试验和拉伸应力松弛试验，研究了在约束状态下裂纹在断裂过程区的局部化机理。此外，考虑到微裂缝的积累，对收缩裂缝宽度的控制方法进行了研究，这对提高钢筋混凝土结构的耐久性至关重要。建立了将拉伸徐变应变与微裂纹累积量相联系的裂缝形态、微裂纹局部化机理和收缩裂缝宽度的分析方法。

In consideration of the moisture evaporation and thermal diffusion in dryness of concrete, this research examined the crack pattern which the volume change accompanying those environment does from simultaneous movement of water and heat. Moreover, the micro crack localization mechanism to fracture process zone under a restricted state was examined from the tensile creep test and the tensile stress relaxation test. Furthermore, the control method in consideration of accumulation of the micro crack was examined to shrinkage crack width important for the improvement in durability of RC structure. As a result, the analysis method has been built by relating of tensile creep strain and accumulation of micro crack, about crack pattern, micro crack localization mechanism, and shrinkage crack width.