Investigation of Adhered Salt at the Entrance Part of Road Tunnels in an Environment that Antifreezing Agents are Scattered
摘要
It is known that antifreezing agents scattered around the entrance of a road tunnel are transported into the tunnel by running vehicles. Most of the antifreezing agents are mainly composed of chlorides, and their adhesion to appendages in tunnels is one of the main factors that promote corrosion deterioration of appendages. Therefore, it is necessary to grasp and evaluate the effect of scattering antifreezing agents on the amount and location of adhered salt in road tunnels. However, the effect has been hardly grasped and evaluated at present. In this paper, multiple stainless steel plates were installed at the entrance part of road tunnels, and the adhered salt was collected and analyzed from the surface of plates after the exposure period. As a result, it was clear that the scattering antifreezing agents and running vehicles may promote the corrosion deterioration of appendages in tunnels depending on the position in a tunnel.