Munna Point Bridge – ASR and chloride-induced corrosion
Construction cost: $3 million
What: Repairs to 106 metre long bridge which is a major link between Noosaville and Noosa Heads tourism districts. Widespread concrete cancer in piles and pilecaps – caused by alkali silica reaction (ASR) and chloride attack.
Where: Noosa Parade, Noosaville
When: Completed mid 2016
Our Role: Structural investigation, Reference Repair design, Prepare D&C Performance Specification, Superintendency of Construction
Awards: Winner – 2016 IPWEAQ Awards (Projects $2 to $5 million)
Munna Point Bridge facilitates Noosa’s economy as a lifestyle and tourism destination. Over 1.8 million trips in each direction are made across the bridge every year, by tourists and locals.
In the 1990’s, large cracks appeared. Early consultants identified the cause as chloride attack and alkali silica reaction (ASR). Later consultants concluded that the service life of the 106 metre bridge would end in 2013, and a $6 to 8 million plan was drafted to replace the full substructure.
In 2014, Noosa Shire Council and TOD Consulting’s engineers re-investigated. We prepared a new plan with Council to extend the bridge life by 50 years, by repairing it. Marine & Civil Maintenance were engaged, and with their specialist structural and durability consultants, they repaired the bridge for less than $3 million.
Safety: The remediated bridge will safely support the $600 million tourism industry
Environment: The saving in materials and energy means that 77% less carbon dioxide has been released into the atmosphere
Bottom line: $3 million is a big saving for Council and Noosa’s ratepayers