Abstract
To find out the re-deterioration mechanism by the drying shrinkage at patch repair region, moisture diffusion coefficient of repair materials which is on the drying temperature and polymer-cement ratio was measured by the Bolzmann-Matano analysis method. Re-emulsification type polymer was adopted in the polymer modified cement mortar (PCM) used as repair materials. The Two-dimensional coupled analysis (FEM) of the moisture diffusion, volumn change by moisture, and mechanical properties was attempted to estimate qualitatively the stress increment occuring at the patch repair region such as repair materials, substrate and interface. The boundary condition is real environmental data of Sapporo, Tokyo and Naha. The cracking mechanism after repair and the selection method of repair materials were discussed.
