2015-03-31 I&S Committee - Item 5 - Attachment 1 - Munna Pt Bridge Repairs Level 3 Bridge Report

Photo W – Pier 5, Core B taken in top of pilecap, near    Photo X – Pier 5, Core A taken in top of pilecap, near
middle. ASR crack extends from surface to reo level       middle. 2 x ligatures in fair condition with surface
                                                          rusting. 103mm cover.




Photo Y – Pier 1, Pile 3 – Temporary hole opened in       Photo Z – Pier 1, Pile 8 – Temporary hole opened in
side of pile. ASR crack extends from surface to reo       side of pile. ASR crack extends from surface to reo
level. High strength steel strand (tensioned) in good     level. High strength steel strand and wire spiral cage in
condition. Wire spiral cage in good condition. 67mm       good condition. Reinforcement headbar in fair to good
cover to high strength steel strand. 60mm cover to wire   condition. 68mm cover to high strength steel strand.
spiral cage.                                              61mm cover to wire spiral cage.




3.0 Condition Assessment

Tod Consulting’s bridge condition assessment (2014) can be quickly understood by
looking at drawing 02600-SK1 in Appendix F. We infer the following conclusions from the
previous testing, inspections and our own testing in 2014:

o   Deck units
    • 4 deck units per span are suffering from ASR, and the prestressing strands and
       reinforcement in these may have corroded. It is conservative to assume these
       deck units are now structurally ineffective.
    • The rest of the deck units are likely to have prestressing strands and
       reinforcement that are 100% intact.




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