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PostPosted: Sun Oct 29, 2017 9:29 am 
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Can anyone advise me to why I should use cement, sand and aggregate over cement and ballast to make concrete? Seems far easier and simpler to make from just cement and ballast.

Thanks :)


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PostPosted: Sun Oct 29, 2017 9:41 am 
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The sand helps fill the voids between the aggregate and with the cement it gives a strong hard mix afetr it is tamped well to compress and drive out the air. Varying quantities of each component can give differing load, durability and flex capabilities I think.

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PostPosted: Sun Oct 29, 2017 10:15 am 
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Just use cement, bagged ballast and water.

I think this is one of those "depends where you are in the UK questions", in the South what we call ballast, as in ton bags, or 20 ton loose loads of the stuff is ready to go in the mixer.

But ooop Norf, according to what I've read on here in older posts, I think what they call ballast is something different, i.e just the stones, so you would need to add sand.

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PostPosted: Sun Oct 29, 2017 10:27 am 
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Ask for ballast in the South West and think you have just landed from Mars. Known as All In here.
Most people use ballast etc for concrete nowadays, but years ago mixes such as 1/3/6 or 1/2/4 were used.



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PostPosted: Sun Oct 29, 2017 1:56 pm 
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It depends on its use and if its internal or external, 2 sharp, 3 Ballast and 1 dust (cement) is a fairly universal mix it tamps down nicely and can be float finished

Quantity's can be referred to as a spade or bag depending on how much you need



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PostPosted: Sun Oct 29, 2017 7:32 pm 
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stuart45 wrote:
Ask for ballast in the South West and think you have just landed from Mars. Known as All In here.
Most people use ballast etc for concrete nowadays, but years ago mixes such as 1/3/6 or 1/2/4 were used.


"all in one ballast" where I live...

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PostPosted: Sun Oct 29, 2017 9:03 pm 
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Here in West Wales it's "all-in" at the builders' merchant ("850kg min." bag) and "ballast" at Wickes, presumably a national terminology - same stuff. I've always taken it to mean that "all-in" means, sand included in the correct ratio. Then the amount of cement determines the strength.



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PostPosted: Mon Oct 30, 2017 11:14 am 
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dewaltdisney wrote:
The sand helps fill the voids between the aggregate and with the cement it gives a strong hard mix afetr it is tamped well to compress and drive out the air. Varying quantities of each component can give differing load, durability and flex capabilities I think.

DWD


Thanks for the science there, I believe it's a 1 cement to 5 ballast that's been recommended.


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PostPosted: Mon Oct 30, 2017 11:16 am 
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Bob225 wrote:
It depends on its use and if its internal or external, 2 sharp, 3 Ballast and 1 dust (cement) is a fairly universal mix it tamps down nicely and can be float finished

Quantity's can be referred to as a spade or bag depending on how much you need


With reference to your ratio, if I was to go the cement plus ballast route, the equivalent would be a 1:5 ?


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PostPosted: Mon Oct 30, 2017 11:19 am 
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Handyman in Sussex wrote:
Just use cement, bagged ballast and water.

I think this is one of those "depends where you are in the UK questions", in the South what we call ballast, as in ton bags, or 20 ton loose loads of the stuff is ready to go in the mixer.

But ooop Norf, according to what I've read on here in older posts, I think what they call ballast is something different, i.e just the stones, so you would need to add sand.


I'll go with that for the sake of convenience and less open to issues. A cement/ballast does seem to be more conventional.


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PostPosted: Mon Oct 30, 2017 3:34 pm 
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5 and 1, or 10 and 2 be it sand, ballast or sharp or a mix - the more sand you use the weaker the mix



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PostPosted: Sat Nov 04, 2017 7:53 pm 
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Bob225 wrote:
5 and 1, or 10 and 2 be it sand, ballast or sharp or a mix - the more sand you use the weaker the mix


Cheers Bob :) I went with a 1 cement to 4 ballast. Oddly the concrete has khaki like tone to its appearance, even though it was poured 48 hours back.


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