Concrete Mix

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Old 02-15-10, 05:01 PM
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Concrete Mix

Home Depot sells bulk (9cu/ft) sand/gravel mix for $29. What ratio of portland cement should I use with this aggregate mix? The gravel looks like 3/4".
I'm mainly using it to pour footings.
 
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Old 02-16-10, 06:14 AM
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That doesn't sound like much of a bargain, but for a 5 sack mix you would use 1.67 bags of cement. In this area, that would put your per yard cost at $120. Buying it as concrete mix in bags would be $128, and it would be a lot easier to deal with.
 
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Old 02-16-10, 10:16 AM
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Well, I don't know.

I've been using 90lb bags of Quikrete concrete mix which yields about 1/2 cu/ft of concrete. That 90 lb bag costs $3.46 at Home Depot here. A yard worth of concrete using these individual 90 lb bags would ultimately cost me $187.

But a yard of sand/gravel mix at Home Depot sells for $87, plus the cost of Portland cement. And a 94 lb bag of Portland cement sells for $8.

Therefore, if my calculations are correct it is definitely cheaper for me to buy the bulk sand/gravel mix plus a couple of bags of Portland cement.

Thanks!
 
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Old 02-16-10, 11:52 AM
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A 90 pound bag should be .76 cubic foot of concrete, requiring 37 to the yard for a price of $128.02
 
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Old 02-16-10, 01:35 PM
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Originally Posted by Tscarborough View Post
A 90 pound bag should be .76 cubic foot of concrete, requiring 37 to the yard for a price of $128.02
Thank you for that correction! Half a cu/ft per bag seemed kinda small. I don't know how I picked up that figure originally. In this case, bagged concrete mix is definitely more convenient.
 
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