A lovely discussion on the quality of concrete dams and bridges, perhaps all the investors on the coast wanting units should buy those instead? At the end of the day all those 70's units are under suspicion and I'd take Professor Holden's word on the matter myself. A 40 year lifespan, pathetic considering the cost of them.
"Panics do not destroy capital; they merely reveal the extent to which it has been previously destroyed by its betrayal into hopelessly unproductive works." John Stuart Mill
Well made concrete is almost totally water tight and additionally is still setting and using water decades after the concrete is poured. Even so here in Finland in the last 3 years it has become commonplace to see concrete bridges being very majorly repaired with works taking about a year to complete with first one side of the road being repaired under cover and then the other. Huge amount of work. Concrete of course is regarded as maintenance free and yet building life today is only aimed to be 30 years. In a modern house that could easily mean tear it down and start again and in an older house there is still a huge amount of maintenance required.
... could you not clad the highrise buildings in some form of skin, like aluminium that would seal the building from the elements??
Therefore extending its life indefinitely??
Peter
The moist air as much the issue as rain and spray peter, I doubt cladding would prevent it getting into the structural elements. They could probably stay up for 100 years but would you want to be living in one when it collapsed under its own weight? Modern concrete made using portland cement breaks down chemically after several decades and crumbles. The rusting steel is the main concern but even using the best stainless steel for reo bar will make little difference after seveal decades, that's why they have a low useable design life. Were talking multi story hirise here, not some bridge over a creek where the supports can as large as you want.
"Panics do not destroy capital; they merely reveal the extent to which it has been previously destroyed by its betrayal into hopelessly unproductive works." John Stuart Mill
The moist air as much the issue as rain and spray peter, I doubt cladding would prevent it getting into the structural elements. They could probably stay up for 100 years but would you want to be living in one when it collapsed under its own weight? Modern concrete made using portland cement breaks down chemically after several decades and crumbles. The rusting steel is the main concern but even using the best stainless steel for reo bar will make little difference after seveal decades, that's why they have a low useable design life. Were talking multi story hirise here, not some bridge over a creek where the supports can as large as you want.
80 million Italians disagree.
Any expressed market opinion is my own and is not to be taken as financial advice
And could you not clad the highrise buildings in some form of skin, like aluminium that would seal the building from the elements??
Therefore extending its life indefinitely??
My best mate owns a business that provides vertical access systems for high rise cladding replacement and refurbishment up and down the Eastern States. Some of his largest and most lucrative contracts are on the Goldie!
A lot of us in the construction game are eternally thankful to the tireless effects of corrosion.
My best mate owns a business that provides vertical access systems for high rise cladding replacement and refurbishment up and down the Eastern States. Some of his largest and most lucrative contracts are on the Goldie!
A lot of us in the construction game are eternally thankful to the tireless effects of corrosion.
I really do love everything Roman and have been fortunate enough to enjoy the magnificence of many of their still standing structures and viaducts and am in complete awe of their technology. It must be said that the Romans used cementious material as a mortar not a structural member ie the filler between the stone work and did not actually do mass plastic concrete pours.
Sure the Germans revolutionised reinforced concrete in the thirties and may have went on to do similar ageless and wonderful things with concrete like the Romans did but that wasn't to be. By the way the Romans used the the mass concrete type design that I mentioned before ie the structure is in compression not tension, the most classic and recognisable of which being the Roman arch a structure that acts in compression and the final keystone is still an engineering marvel to this day and very much used in modern tunneling construction.
Take heart citizen, we have our own technological pioneers breaking through established norms with concrete and structural technology right here in our back yard in Toowoomba. The Wagner family (no not connected to the composer) have revolutionised the industry with cement-less concrete and also built the fist ever composite traffic bridge structure in the world, they had to do it in Rochester NY just to get legs but they are doing many bridges locally now, I have seen them made. These guys do R&D like no other I have been involved with in Aussie.
the initial construction of the reinforced structural concrete structure is carried out incorrectly due to poor workmanship standards. Typically this includes insufficient cover on the reinforcement bars, insufficient fixing of reinforcing bars resulting in them moving during concrete placement, insufficient vibration of plastic concrete which results in porous cavities forming, inadequate concrete placement techniques which result in segregation and porous sections forming, concrete that has commenced initial set being placed, excessive time elapsing between concrete placement of different mobile agitator loads resulting in cold joints forming that are susceptible to moisture ingress, mortar leakage through form-work voids and incorrect concrete mix selection.
Reinforced concrete is a highly durable product and a 100 year design life in coastal areas is readily achievable, concrete will only spall due to poor placement techniques or the section in question was under designed which is unlikely if it was designed to Australian Standards.
I have seen re-bar rusted to buggery being encased in concrete. The main problem is continuing rust due to water penetration after completion. This is solved by correct weatherproofing of exterior faces and by giving moisture a means of escape (allowing the concrete to "breathe").
Matthew, 30 Jan 2016, 09:21 AM Your simplistic view is so flawed it is not worth debating. The current oversupply will be swallowed in 12 months. By the time dumb shits like you realise this prices will already be rising.
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