Tolaga Bay Wharf is a protected historical structure. The wharf was built in the early 1920’s using unwashed aggregates off Napier Beach and the local water supplies are very salty. Serious corrosion became evident within 7 or 8 years following construction.
Remedials are currently funded by local efforts and lottery donations. The objective therefore was to remediate and/or preserve the concrete structural elements, within a budget that reflected the minimal funds available. Pieces of the original steel were extracted which displayed milling scale, or in many cases complete corrosive destruction.
Steel below lowest tide level was all sound, and mostly still with mill scale, due to having very little oxygen to sustain corrosion, along with some protection by cathodic activity associated with aggravated corrosion in the adjoining wet/dry section of piles.
How could MARKHAM help preserve the ageing structure, within the limited budget?
Download the free case study, which includes the solution, a discussion on the extra challenges, the result, and updated photographs from 2024!