Concreting steep slopes - Ready mix or self mix?

[fairview groundworks]

I have laid a few farm entrances so concreting in general is OK but next job is on a slope steep enough that is 4 x4 only. I have to extend 20ft from existing.
Tamped finish to give more grip
do I trust the ready mix boys to delivery concrete with just the right slump otherwise I will have a dam at the bottom !! or do I get two mixers going and a team and set to.

Are there any ready mix tricks ? I have spoken to 2 companies and they can't guarentee anything

Size 20ft x 8ft x 6"

thanks

[lutonlagerlout]

IIRC block paving is more suited to slopes over 12%
as you correctly worry ,concrete and gravity dont mix
if its for farm vehicles 80mm blocks on 30 mm grit sand and 200mm sub base should work
i have seen concrete belly on slopes and your heart goes into your mouth
LLL

[GB_Groundworks]

We have done concrete on steep slopes, decent concrete companies you can specify your slumps and mixes. We use cemex can't beat them, I wouldn't use volumetric as the mix tends to be poor, alternatively get your concrete and hold it till the right slump. Concrete sat in an idling dumper goes off really quickly,

[fairview groundworks]

Thanks so far

I think i need an S1 slump. we also have cemex down here in sussex. Do you think S1 is right for a slope that is very steep?

would you pour it all in one go?

[GB_Groundworks]

Cemex are global,

not in one section it out then extract timbers and fill voids, like building a concrete staircase.

Rough tamp or heavy brushed finish or add grit. Alternatively ronafix do high grip overlay products for concrete

Yeah s1 for slump.

[fairview groundworks]

ok one last question, confidence is gaining all the time

so its a 6m length , i could make the "steps" every metre and if i understand correctly the staircase effect the concrte will be in one complete mass beneath the wooden formers.

the formers just hold it a bit while it sets

[rab1]

yes is the short answer. just spend the time on the prep as you only get one go.

[GB_Groundworks]

yeah, they are there to stop it slumping back down the slope only really needed on steep slopes

start at the bottom dont fill it all up at once, dont vibrate it or over tamp it till the consistency is right

and work from bottom to the top with finishing

[fairview groundworks]

In case anyone was wondering... job done, superb

Before all the snow, just! Perfect mix and slump care of a helpful bloke at the batching plant from Bretts Concrete.

We started at the bottom as suggested, had rebar retaining " goalposts" every meter across the drive and didn't tamp too much. We add fibres just to make sure. It was really sticky and went in and then off a treat.

Customer still hasn't driven on it due to weather.

Thanks to all the advice.

[Suggers]

I was wondering - terrific - time to put up some photos David?