#1  
Old 01-01-2013, 09:54 PM
Laborer
 
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Default Brickies Grey for Concrete Pad?

Hi Guys

I have an opportunity to buy bags of brickies grey for 4 bucks a bag, which is a good deal in my mind. I need to lay about a cubic metre of concrete for a pad for an outdoor kitchen...so low stress application. Brickies grey is 50/50 cement/hylime.

Do you think it would work ok as concrete if i mix with sand/aggregate in the normal ratios?

Cheers!
Alexi
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Old 01-02-2013, 02:24 AM
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Default Re: Brickies Grey for Concrete Pad?

No, it will not have the same strengths. Since you mentioned having the sand and gravel, I would go ahead and get portland cement.
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Old 01-02-2013, 02:40 AM
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Default Re: Brickies Grey for Concrete Pad?

hey thanks for the reply. I dont already have the sand/aggregate as yet...i just saw the good price for the grey and was hoping to use it.

it may not be as strong, but would it necessarily be a poor pad? as in would it still do the job i guess is my question...
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Old 01-02-2013, 04:41 AM
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Default Re: Brickies Grey for Concrete Pad?

Lime in the mix tends to retard hydration, so to boost strength by adding more Portland you have to double your quantity. At your $4 price you aren't gaining much. Portland is $10/20kg where I come from.
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Old 01-02-2013, 04:55 AM
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Default Re: Brickies Grey for Concrete Pad?

It will be about 800 psi at a 50/50 ratio, a little higher with stone aggregate, so it will work, but you should add enough portland to get it to a ratio of 75/25 if possible.
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Old 01-02-2013, 01:23 PM
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Default Re: Brickies Grey for Concrete Pad?

Ok cool, 800 would probably suffice.

If it is reinforced with steel bar, that would increase the PSI yea? i have a heap of that as well lying around.
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Old 01-02-2013, 03:13 PM
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Default Re: Brickies Grey for Concrete Pad?

Rebar doesn't affect the compressive strength, just the tensile strength.
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Old 01-02-2013, 03:41 PM
Laborer
 
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Default Re: Brickies Grey for Concrete Pad?

Yea true....didn't think that one through.

so what compressive strength would suffice for a pizza oven....if a house pad is between 3000-5000 psi, surely 800-1000 would suffice for oven?
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Old 01-02-2013, 07:34 PM
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Default Re: Brickies Grey for Concrete Pad?

Quote:
Originally Posted by alexi82 View Post
Yea true....didn't think that one through.

so what compressive strength would suffice for a pizza oven....if a house pad is between 3000-5000 psi, surely 800-1000 would suffice for oven?
You should reach for, at least, the same as your house. Your oven will exert more pounds per square inch than the middle of your living room. Save the good deal on the mortar mix for the decorative brick or for making home brew.

Just Sayin'
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Old 01-02-2013, 07:53 PM
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Default Re: Brickies Grey for Concrete Pad?

Quote:
Originally Posted by Gulf View Post
You should reach for, at least, the same as your house. Your oven will exert more pounds per square inch than the middle of your living room. Save the good deal on the mortar mix for the decorative brick or for making home brew.

Just Sayin'
Fair point i'll still get the cheap brickies grey coz its a good deal and i'll use it for mortar anyway....

Thanks!
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