Tied-arch bridges are widely used because of its capability of providing clear load path long span and high clearance. However the steel elements of a tied-arch bridge are subject to corrosion which could lead to accidental bridge failure or even collapse when coupled with other bad factors. Hanger anchors as the key elements along the load paths were usually tightly sealed in the anchorages during construction to protect them from corrosion attacks in their service life. This makes it very difficult to manually inspect the corrosion conditions of hanger anchors. Corrosion inspection of hanger anchors has been a blind spot in tied-arch bridge routine maintenance.Corrosion monitoring using different sensorsystems was utilized to provide bridge owners with awareness of possible corrosion of hanger anchors allowing them to make informed maintenance decisions accordingly thus increasing bridge operational safety.

Most composite repair installations take place with some amount of pressure in the pipe. The traditional design standards ASME PCC-2 4.1 and ISO 24817 each provide a design equation that includes consideration of installation pressure but the equations up to this point have been theoretical only and never tested. It is important to note that in the equations an increasing installation pressure acts to reduce the required composite repair thickness. This experimental test program studied the effects of internal pipe pressure during installation on composite reinforcement systems to verify if the performance of the repair was maintained when applied to simulated corrosion defects. The full-scale testing analyzed the effects on the burst pressure and the cyclic pressure fatigue life of a pipe with a 50% wall loss simulated corrosion defect. The installation pressures considered were varied from 0 up to 50% SMYS. The results of the test are presented and recommendations given for design use in future works.

Reinforced concrete towers in a water reservoir contain gates and the equipment to control the water entering the system. Any interruption in the operation of these towers may cause a huge disruption in the municipal water distribution system. Continuous operation in an aggressive environment often contributes to corrosion of aging water infrastructure. A failure due to corrosion would necessitate extensive repair or replacement costs and unacceptable system downtime. This paper presents a case study focused on a comprehensive condition assessment and corrosion mitigation of an aged forebay outlet tower in Southern California. The inspected tower - in operation since 1941 - is a crucial structure in a water distribution system serving most of the 19 million people in Southern California. The tower illustrated significant concrete deterioration and corrosion of the reinforcement above the operating water surface elevation. An impressed current cathodic protection (ICCP) system was designed and installed on the tower to extend the life of the structure. Field activities and ICCP installation were dictated by restricted shutdown schedules and operational constraints. The paper addresses the methodology for condition assessment and cathodic protection design as well as challenges encountered due to schedule/operational constraints.