Bon Tarde,
If I buy 1 bag of cement; 90 lbs I think it is; how many cubic feet of concrete can I expect to get using a mixture of…..
1 cement 2 sand 4 gravel and appropriate amount of water?
I am shooting for 3000 lb concrete for a footing below a porch.
I’ll use the whole bag of cement.
Thanks.
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Replies
A 94lb bag of cement is exactly 1 cu ft. So you're talking 7 cu ft.
so buy 80# sacks of high strenth concrete..
80# of concrete (dry mix) is point 6 cubic feet...
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a cubic yard of 3000 is a four sack
I thought it was 6 sack.
four bags of portland...
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming<!----><!----><!---->
WOW!!! What a Ride!
Forget the primal scream, just ROAR!!!
"Some days it's just not worth chewing through the restraints"
Well, his OP mix is close on then.
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actually, I think it would be six cf because the portland fills the spaces between the particles of aggregate to form the bonds, soit does not count in the volumn. I am also thinking that this mix would be weaker than 3000#, not sure.
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Yes, you're right. His mix is not 6 sack, and the total is going to be shy of 7 cu ft. due to the sand filling in around the gravel. I'd lose one gravel from the mix myself.
six sack is a 5000 psi
Well, you're the expert. I don't do much of it, so I use sakrete. Or use 1 cement, 2 sand, 3 gravel.
Sakrete concrete mix is available here; comes from Venezuela; but it is very expensive.
We can also get Sakrete sand mix (mortar) for $14 a 80 lb bag.
I'd like to get a load of sand and a load of gravel and mix my own.
concrete is batched by weight to obtain volume. batch plants know the approximate weigh of sand and stone (+/- for moister containt). they know the exact weight of the water, cement and add mixtures. one bag of cement = 1 cu ft = 94 lb. 6 bag mix = 4,000 psi +/-, 5 bag mix = 3,000 psi +/-. the cement acts like the glue to hold every thing together. while adding more cement will generally give concrete with a higher compressive strength, a lot more goes into it. strengths of concrete are base on water to cement ratio, or w/c. .54 w/c will give you 4,000 psi (i think it's .54, it's been a while since i looked at my apprentice books). from there it is some basic math. entrained air contain is also important. you will loose 5% of the strength for every 1% of entrained air above 6%. it starts to get kind of complicated, but remember this, readi mix concrete is over engineered by about 10%. if you order a 4,000 psi mix and you don't abuse the water, you should end up with 4,400 psi.
for hand mixing a 3,000 psi mix, i believe the ratio is 1:2.5:5. use as little water as possible to obtain a workable mix. if you add to much water this ratio doesn't mean anything. if in doubt, add a little extra cement.
Thanks to all.