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Posted by Italian on August 12, 2006, 10:34 am
Listen up everyone that is thinking of mixing there own concrete for a
situation such as this. Or anythng over 1 yard
======IT WILL NEVER PAY TO DO IT YOURSELF. HIRE A TRUCK AND OR A
PUMP.======
> Assuming I'm just tipping the concrete straight into the ready prepared
> area, with a bit of tamping and smoothing, I can probably mix and tip about
> 12 loads = 1 cubic metre, in 70 minutes, with possibly 20 mins more for
> actually shovelling all the ingredients into the mixer.
You for got things like roding the concrete to make sure it is at the
right level and if it is not having to go back and move material from
another area or rake it up closer. You forgot bullfloating it to get
the rocks down after its is roded you for got running the edger along
the forms for the first pass....plus much much more this all takes time
and must be done at a certian "set" time in the the process. Mixing and
pouring and mixing and pouring will greatly interupt this process...can
it be done yea sure but how much do you want to do it again when it
fails in a year or so? Look if you want to do it this way do very small
sections at a time and place rebar dowels at the edge of the slab ready
for the next pour. You can drill holes in the form and place the rebar
in these holes the next day take these forms out and pour up to it and
repeat. BTW you dont necessarialy have to do one pour a day you can do
as many as you can just make sure to finish the process with the
previous one first then move on to the next one. Butting slabs together
is not the problem its not tending to the already poured concrete that
is the problem......
if you figure just the materials you are already so close to the cost
of redimix it is not worth the hassel...time is also money......
James wrote:
> I want to lay a garage base at the bottom of my garden, for my motorbikes.
> It is 25 metres from the road side so delivery of pre-mixed concrete will be
> a problem, or expensive, or both.
>
> I can mix the concrete myself using a cheap to hire mixer but I need some
> advice on the amount to lay in one batch, to avoid cracks.
>
> The slab will be 6m x 4m x .125m = 3 cubic metres.
>
> The mixer spec says it can mix 85 litres in 6 minutes.
>
> Assuming I'm just tipping the concrete straight into the ready prepared
> area, with a bit of tamping and smoothing, I can probably mix and tip about
> 12 loads = 1 cubic metre, in 70 minutes, with possibly 20 mins more for
> actually shovelling all the ingredients into the mixer.
>
> This means I can lay one third of the base in about 1.5 hours.
>
> So, help needed here :- What is the best way to do this?
>
> I'm assuming I can't just lay the whole base over a space of 1.5x3 hours =
> 4.5 hours as the concrete at one end will have started to go off before I've
> finished at the other end?
>
> Should I lay 2 slabs, 2 metres wide each, with a 2 metre gap between them?
> Then, I could wait a few days until they have both gone off then fill in the
> gap with another slab? Will this be prone to cracks between the 3 separate
> sections?
>
> Any ideas anyone. All comments and advice greatfully received.....
>
> Cheers
> James
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