Concrete slump for icf

[Russell griffiths]

Hi I have had a couple of different opinions

what sort of slump did you specify with your icf pour. 

Two opinions

one was 100mm the other 80mm. 

Any thoughts people. 

Cheers russ. 

[scottishjohn]

good question.

I have been looking at  all types of ICF and the different makers seem to specify different slump rates

I will certainly be getting a slump tester of my own to check  what they  supply me before i let them start pouring and use my ICF suppliers spec as my guide

[ToughButterCup]

Durisol needs 'scotch broth'.

Thats as technical as it got. The lad on the wagon and, by chance, the lad on the pump both knew of Durisol and the general requirements for slump. At first sight it's worryingly wet.

Durisol technical guidance is available on their site

[scottishjohn]

certainly poly types of ICF need it thicker than durisol or the hydraulic pressure is too great +that will cause lots of blow outs.

even then different makers specify dif rates and types of mix --and very gentle pokering if  any with poly types

,some say use self compacting concrete --but that will still have a slump rate.

looking at the "velox " type which is basically durisol type stuff --but just flat boards and no webs,but lots of metal ties- and they pour as thick as poly types

-just fully open void to fill ,no webs to go round

and not a sign of bracing in any of the companies vids -but it is nailed together as well  and looks like 3m pours after first  0.8m pour at slab

certainly might consider that for basement /garage and a velox concrete roof  to comply with fire regs for a garage below living space --just the stuff  to make your bomb shelter out of . lol

 

 

 

8 minutes ago, recoveringacademic said:

Durisol needs 'scotch broth'.

Thats as technical as it got. The lad on the wagon and, by chance, the lad on the pump both knew of Durisol and the general requirements for slump. At first sight it's worryingly wet.

Durisol technical guidance is available on their site

 

[Mr Punter]

I think it depends on ICF, pour height, concrete core thickness and reinforcing. Your ICF people / engineer should specify the concrete. Hopefully your pump guy will not spend too much time pissing in your ear and trying to get water added. Let them all know you will be doing slump and cube tests on the concrete.

[ToughButterCup]

36 minutes ago, Mr Punter said:

[...]

Let them all know you will be doing slump and cube tests on the concrete.

 

+ a million. Focuses minds just beautifully.