Cutting up my raft foundation

[Gone West]

@saveasteading This might be of some interest. Sorry about the quality.

 

 

[saveasteading]

Thanks. Very traumatic and expensive. What was the obvious sign that there was a problem with the slab?

[Gone West]

54 minutes ago, saveasteading said:

Thanks. Very traumatic and expensive. What was the obvious sign that there was a problem with the slab?

We filmed the whole process and saw a lot of incidences of poor workmanship which made us think there were voids in the concrete. We had non destructive testing carried out over the whole slab which indicated a lot of problem areas. Those areas were core drilled which confirmed there were voids. The company accepted the results and the whole lot was replaced at no cost to us.

[saveasteading]

The lesson learnt by the company was, I assume, to always get the concrete in quickly, ie pump. Also the recipe for a pump mix is different, so flows better even if barrowed. 

[Spinny]

18 hours ago, Gone West said:

saw a lot of incidences of poor workmanship which made us think there were voids in the concrete.

What sort of poor workmanship ?

(I guess a lot of people like me would just assume a concrete pour is hard to get wrong.)

 

Any idea of the cost of concrete cutting ? Did they use a specialist contractor or just hire in the cutting machines ?

[Gone West]

42 minutes ago, Spinny said:

What sort of poor workmanship ?

They were barrowing the concrete, it was summer, the concrete wasn't flowing out of the barrows, it was coming out in lumps.

 

44 minutes ago, Spinny said:

Any idea of the cost of concrete cutting ? Did they use a specialist contractor or just hire in the cutting machines ?

I didn't get involved in the details of the slab removal, other than to get an assurance that there would be a different team who were competent.