If they get Aussie highway engineers to plot motorways with 130 km/h limits, as in the rest of the civilised world, then sold. Otherwise, fuck 'em.
The speed limit is not really a problem design wise our curves and super-elevation can handle them, no difference to pavement or bridge design either as they are designed around heavy load trucks, car wheel loads don't register. By the way the yanks are pussies when it comes to speed.
Jimbo
29 Aug 2015, 07:12 PM
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").
I agree with the papers conclusions but would say that mill scale is perfectly acceptable on the surface of reinforcing bars pre-pour, I am not aware of that being a rejection criteria in Oz. I would bale up the contractor through if they had form-work oil, previously set mortar splatter and other contaminants on the bars, the consequence of this may be debatable on deformed bars (as shown in the diagram) but good workmanship standards would prevent this and once you give quarter here you start losing overall control, this is a definite rejection in a high quality situation. As for concrete breathing, that's news to me, my experience is that its all about encapsulating the steel reinforcing bar in a very dense impermeable concrete matrix, the bond between the bar and the concrete is that which transfers the tensile load, any breathing (non bonded surfaces) would undermine this bond.
As for concrete breathing, that's news to me, my experience is that its all about encapsulating the steel reinforcing bar in a very dense impermeable concrete matrix, the bond between the bar and the concrete is that which transfers the tensile load, any breathing (non bonded surfaces) would undermine this bond.
Like any substrate, if you waterproof every surface, you won't get water damage in the substrate.
The problem is that if you fully waterproof anything, if there is any breach, water that penetrates can't get out again. I have a good understanding of breathable substrates having cut my teeth on pre 1900's buildings in the UK.
You only need one breach to start a rust process in the rebar. Once the process has started, the rebar rots away and creates a London Underground type network for water to travel to all of the other rebar in the concrete section.
Allowing any penetrating water to permeate through the substrate to be air dried away, helps to negate the problem.
Bardon
29 Aug 2015, 07:19 PM
and once you give quarter here you start losing overall control, this is a definite rejection in a high quality situation.
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.
Yes yes bardon, all the technology is there, but guess what? Builders making residential towers couldn't give a shit, they will skimp every chance they get. I have seen the official fill the little steel cans with concrete samples and as soon as he's left site the lead concreter gives the thumb to mouth sign to the truck driver to pour in a shit load more water. It's standard practice else the concrete is too hard to work.
All general residential construction is as cheap as dirt now, just like in Japan towards the end of its bubble phase.
"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.
Bad investment then??
Peter
stubby
29 Aug 2015, 06:59 PM
If they get Aussie highway engineers to plot motorways with 130 km/h limits, as in the rest of the civilised world, then sold. Otherwise, fuck 'em.
Oh they could do it, but dumb dumbs can not drive at that speed.
Peter
The Whole Truth
29 Aug 2015, 11:17 PM
Yes yes bardon, all the technology is there, but guess what? Builders making residential towers couldn't give a shit, they will skimp every chance they get. I have seen the official fill the little steel cans with concrete samples and as soon as he's left site the lead concreter gives the thumb to mouth sign to the truck driver to pour in a shit load more water. It's standard practice else the concrete is too hard to work.
All general residential construction is as cheap as dirt now, just like in Japan towards the end of its bubble phase.
We are seeing 30-40 year old blocks of 6 - 20 units being knocked down to make way for blocks of 50-500 in Western Sydney, On average the developers are offering about 50% more than market to rebuy the best sites for redevelopment.
This practice will hopefully become easier as the unanimous resolution of the body corporate gets scaled down to a 75% majority resolution.
But in truth it is unacceptable to see that we think a 40 year old building is old when my dads home (more a small one room upstairs/ one down terrace squat) was built in 1616 and looks better today than he ever recalls. (Though he wasn't born until a little after 1616)
You cant drive a house, BUT you can always sleep in a car!
This practice will hopefully become easier as the unanimous resolution of the body corporate gets scaled down to a 75% majority resolution.
Quote:
We are seeing 30-40 year old blocks of 6 - 20 units being knocked down to make way for blocks of 50-500 in Western Sydney, On average the developers are offering about 50% more than market to rebuy the best sites for redevelopment.
Are these decaying pieces of shit? Or do they still have useful life left?
My parents have a Brisbane inner city unit in a 70's six pack that's as solid as the day it was built (mostly brick not concrete). If all the owners wanted to sell they could probably get more each if it sold as one and could be replaced with a 20+ storey tower.
We are seeing 30-40 year old blocks of 6 - 20 units being knocked down to make way for blocks of 50-500 in Western Sydney, On average the developers are offering about 50% more than market to rebuy the best sites for redevelopment.
Yes those little blocks can be pushed over with an excavator, but a 30 story hirise is another matter and the coast is lined with them from top to bottom. Even the old Iluka apartments was a relatively simple demolition compared to bringing down what's been built since.
"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
Yes yes bardon, all the technology is there, but guess what? Builders making residential towers couldn't give a shit, they will skimp every chance they get. I have seen the official fill the little steel cans with concrete samples and as soon as he's left site the lead concreter gives the thumb to mouth sign to the truck driver to pour in a shit load more water. It's standard practice else the concrete is too hard to work.
All general residential construction is as cheap as dirt now, just like in Japan towards the end of its bubble phase.
All you ever have is little made up stories, and it's boring.
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