無拘束モルタル試験体の乾燥収縮応力に関する検討

概要

論文の詳細を見る
There are many factors on strength changes resulting from moisture changes in mortar or concrete, for instance, transitny progress of hydration and hardening at drying, etc. The main factor may be drying shrinkage-stress in drop of bending and tensile strength. As the arbitrary distribution of shrinkage-strain is not permitted in the continuum, the shrinkage-stress of unrestrained specimen must satisfy the condition of continuity in the distribution of shrinkage-strain, or, if it agrees with the pattern satisfied the condition of continuity, shrinkagestress does not arise. The strain εs by stress is εs = ex + S where ex is real shrinkage-strain in the direction of length of specimen,a nd S is free, unrestrained unit linear shrinkage-strain. Therefore, if ex and S are known, the strain εs or it's stress is given. Although it is desired that both ex and S are get experimentally, S can be little get by experiment. About the theoretical method on free shrinkage-strain, there is the way of diffusivity equation, and drying shrinkage process coressonds to the equation of heat conduction. G. Pickett is one of reseachers lead this solution and analysed shrinkage-stress. Authors added the experimental study on his analysis and considered the possibility of it's appncation.
長崎大学工学部の論文