Effect of Sheath Spacing and Grout Filling Status on Sheath Corrosion Cracks of Post-tensioned PC

To investigate a simple method for estimating the state of grout filling from cracks along a sheath, we focused on cracks caused by sheath corrosion. An electrolytic-corrosion test was performed using the space between two sheaths and the grout filling condition as parameters. In addition, two-dimensional finite element analysis was performed to confirm the occurrence of stress and strain due to these changes. As a result, we demonstrated that if the space between two sheaths is small, internal cracks might occur earlier than in the concrete surface. In addition, in cases where grout is not filled, the possibility of cracking due to sheath corrosion at that portion is small. However, we showed that corrosion of an adjacent sheath may affect the corrosion cracking properties.