Aerated concrete in uk 2

[Alistair_Heaton]

https://www.theguardian.com/educati...o-be-at-risk-of-collapse-as-concrete-crumbles

Personally I had never heard of the stuff until I started looking at building a workshop.

It has some brilliant properties, but admit the more I digged into it the more involved it was designing with it and onsite compliance with plans.

Locally to me builders really don't want to change their methods. Or materials used. The sites I have seen using it they all seem to use black bar reinforcement. Which is a huge no no. The architects also seem love to pour c20 to fill gaps which messes with the weight loading and gives dissimilar stress concentrations.

Code wise it's lumped in with general construction codes. Australia seems to have a sub set for it.

I have found you need to think of the stuff as a bath sponge. And you need to design round moisture transport, letting it breath and move. Here they cover the stuff with moisture barrier or some other form of barrier which stops evaporation off its surface. Then it just loads up with water. As it's 80% air it's no wonder things fail when it doubles in weight.

 

[Alistair_Heaton]

I am lucky in my region one of the local products is high quality glass so the local uncertified sand basically extremely high grade silca glass grade.

the locals just dig it out the ground and use it. i have only used certified concrete for the foundations. .

if i need buffer sand its phone call and then 5 tons turnup inside 2 hours. its glacial moraine sand and its just packing.

There is a radon issue with aerated but not with my local product.

 

[Alistair_Heaton]

on the subject of builders not looking at drawings.

This is some fisheries building in India.

Seems to be international completely ignoring the drawings

 

[IRstuff]

A render is not a construction instruction, it's strictly for a pretty picture; there's a long way to go between a render and finished product

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert!

https://www.youtube.com/watch?v=BKorP55Aqvg

faq731-376 forum1529 Entire Forum list

http://www.eng-tips.com/forumlist.cfm

 

[Alistair_Heaton]

I knew but it made me laugh and think of what we were talking about.

 

[Alistair_Heaton]

https://www.theguardian.com/educati...ose-buildings-made-with-crumble-risk-concrete

More buildings getting closed.

 

[TigerGuy]

https://www.newcivilengineer.com/la...the-structurally-unsound-material-07-09-2023/

Update via NSPE