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insider

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Joined 8 April 2014
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11 d11 dinsiderinsider posted:
Which Slab is Better? Waffle Pod or Raft Concrete Slab???

Needs to be drained away.I'm not saying it's impossible but is complicated.I would use a cut off drain into the clay base in front of the excavation with plastic lining…

11 d11 dinsiderinsider posted:
Which Slab is Better? Waffle Pod or Raft Concrete Slab???

Yes thanks for the explanation.So the piers are 200mm deep or did you mean 2000mm deep ?

11 d11 dinsiderinsider posted:
Which Slab is Better? Waffle Pod or Raft Concrete Slab???

Having piers founded in rock will only leave heave as an issue if it is moderately reactive then that risk is significantly reduced although not quite so much with potential…

11 d11 dinsiderinsider posted:
Which Slab is Better? Waffle Pod or Raft Concrete Slab???

What I meant is why give 25mm of settlement if your piers are in natural not fill.Shouldn't that be 50mm of expected ground movement with minor initial settlement and a…

11 d11 dinsiderinsider posted:
Which Slab is Better? Waffle Pod or Raft Concrete Slab???

Sometimes the simplest approach is the best
Why not stiffened raft slab on bored piers to rock? rock is relatively shallow
By digging out soil you create an area for water…

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11 d11 dinsiderinsider posted:
Which Slab is Better? Waffle Pod or Raft Concrete Slab???

Interesting they gave 25mm settlement even though you are on piers?
And if you are on piers in fill shouldn't that be a Class"P"?
As you say builders won't adapt option 3…

11 d11 dinsiderinsider posted:
Which Slab is Better? Waffle Pod or Raft Concrete Slab???

Good post Mark
I like option 3 on screw piles with a void former underneath .They used to use cardboard void formers back in the day but I like the
sound…

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12 d12 dinsiderinsider posted:
Which Slab is Better? Waffle Pod or Raft Concrete Slab???

Sweetswisssteel
Here is 3 Phd's written of the topic with local conditions I have been involved in 2 of them.

12 d12 dinsiderinsider posted:
Which Slab is Better? Waffle Pod or Raft Concrete Slab???

It's a heavy read but explains almost everything that happened with the slab heave in Melbourne.

12 d12 dinsiderinsider posted:
Which Slab is Better? Waffle Pod or Raft Concrete Slab???

The reason they are so popular are they are cheaper than stiffened raft.Due to so many failures particularly in the western suburbs engineers have been starting to do hybrid slabs…

19 d19 dinsiderinsider posted:
Help verifying/understanding my site investigation report

If you are using a soil report form 2007 then you will definitely need a new as the Australian standards have changed since then.
An engineer can use engineering principles to…

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21 d21 dinsiderinsider posted:
Help verifying/understanding my site investigation report

This is an interesting statement form the report considering it is in Clayton Sth
"The slab as recommended above, is designed to act as a whole unit so that it can…

21 d21 dinsiderinsider posted:
Help verifying/understanding my site investigation report

Justme15 I would prefer a conventional raft slab siting on bored piers that are at least 3m deep.Conventional raft slabs have edge beams and internal beams dug into the ground…

24 d24 dinsiderinsider posted:
Bricklayer or Engineer

From my experience the footing may not be a 100% in that corner.If you dig up the corner and see if the footing extends out to form a proper rebate…

24 d24 dinsiderinsider posted:
Help verifying/understanding my site investigation report

Yes trees roots love water and oxygen the two things they would get with the soil replacement method in this situation. But I do like alternative solutions sometimes like you…

24 d24 dinsiderinsider posted:
Help verifying/understanding my site investigation report

No TMI refers to the climate category which then determines the Hs.Soil suction is set at Delta u 1.2pF at the surface and equilibrium at the Hs depth.Gravels don't negate…

24 d24 dinsiderinsider posted:
Help verifying/understanding my site investigation report

It's talked about in AS2870 and there is a lot of info on the net.The have said in the report that the clay is highly reactive
I would be interested…

24 d24 dinsiderinsider posted:
Help verifying/understanding my site investigation report

Yes I agree class p engineer designed slab on piers.
I know they use the system you mentioned in the US but it has issues as well.If you use road base…

24 d24 dinsiderinsider posted:
Help verifying/understanding my site investigation report

You can't have a conventional slab with piers it has to be engineer designed because it is a class "p" site.You can't simply put a
deemed to comply slab…

25 d25 dinsiderinsider posted:
Help verifying/understanding my site investigation report

Hi Justme
Can you post the borehole logs?

29 d29 dinsiderinsider posted:
Exposed waffle pod after slab pour?

This looks to me like some material between the formwork that now has been removed and the poured slab.It should just peal off.It could not be the foam waffle pod…

29 d29 dinsiderinsider posted:
2nd soil test - contours changed

yes they often will do a site scrap after demo.

1 month1 monthinsiderinsider posted:
Which Slab is Better? Waffle Pod or Raft Concrete Slab???

They actually lose on earthworks because every site has to be cut flat unlike conventional raft slabs.This is one of many reasons why slab heave is more common these days…

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1 month1 monthinsiderinsider posted:
Which Slab is Better? Waffle Pod or Raft Concrete Slab???

Waffles have been shown to be more susceptible to ground movement on highly reactive soils.
Some engineers now design a hybrid which is a waffle slab with dug in deepened…

1 month1 monthinsiderinsider posted:
Has anyone rectified slab heave successfully

Is there any damage?

1 month1 monthinsiderinsider posted:
Has anyone rectified slab heave successfully

If you’re after the cause of slab heave then you will need a geotechnical report

1 month1 monthinsiderinsider posted:
Has anyone rectified slab heave successfully

Do you mean for a report ?

1 month1 monthinsiderinsider posted:
Edge beam on rolled fill?

Yes this is in AS2870-2011 6.4.2 to be compacted with repeated rolling of an excavator or similar and in 150mm layers if not sand

1 month1 monthinsiderinsider posted:
Stumps already in place

A footing probe is basically digging up the full depth of a stump in your case and measuring the dimensions and the founding soil, you will need to know …

1 month1 monthinsiderinsider posted:
Stumps already in place

I don't like your chances but you will need a another soil test and they will need to do at least one footing probe to confirm everything.
Remember even though the…

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