Paper No. 103
Mr Inam Khan1, Mr. Jonathon Dyson1, Mr Marton Marosszeky1, Mr Frank Papworth1 – 1BCRC, , Australia
Durability Plans for projects are seldom developed for existing structures. However,
fib Model Code 2020 which is in development will include existing structures alongside new structures. Australia is well advanced with CIA Recommended Practice Z7/01 being the first international document detailing the approach. Z7/01 is based on experience from 10 years of formal durability planning on major government infrastructure projects in Australia.
Durability plans are typically based on the project technical criteria (which are normally based on national codes) and the owner’s standard specification as minimum requirements. For new structures the durability plan may not typically make major changes to the structural design, although the durability consultant may help to identify significantly different options to the standard design requirements.
However, for the assessment and remediation of existing structures, the durability consultant’s role is much more fundamental to the development of the primary design approach. As such the durability consultant needs to be involved prior to other experts to determine the nature and extent of deterioration and how that might influence the most economic design approach. Given the more uncertain nature of repairs they may also require time to undertake trials, particularly where cathodic protection systems are involved. Even where a design and construct project is envisaged, the durability consultant needs to identify parameters that will ensure that the repair solutions offered will closely meet the owner’s needs. There is a need for a much wider appreciation of materials properties than exists for new construction, where the range of materials used is usually more limited. A much greater understanding of processes of assessment prior to repair design is required. This paper discusses a strategic inspection and repair procedure for a major marine complex.
Keywords: durability planning, new projects, existing structures, inspection, repair.