y 'edumacted' input says that it is 25 instead of 50 and you end up with 3 cubic feet of concrete. Keep us informed.(quoted from post at 18:20:49 05/25/18) Guess I will have to shovel a bag in it and multiply times 5 to get sand and gravel. That I know how to do. We can buy the sand and gravel already mixed correctly at the pit, just add cement and water. For those that haven't been around one a one bag mixer is a big one.
do not believe the 94# per cubic foot is a correct density. More like 196/cu ft. Factor off by about 2:1, I do believe.(quoted from post at 20:52:46 05/25/18) JMOR; getting 3 cubic feet of concrete from a 1 cubic foot bag of cement (94 lbs) would be a substantial waste of cement for general purpose concrete. Using the 1-2-3 mix that several others here have recommended provides a perfectly adequate general purpose concrete. It works out to about a 5-1/2 sack (of cement per yard of concrete) mix, which is about a half a sack richer than the mix you will get from a transit mix company unless you specify something else. Getting 3 cubic feet of concrete from a one cubic foot sack of cement would work out to be about a nine sack mix. You might need that rich a mix if you were casting containers for holding radioactive waste. I wouldn't know.
In figuring the volume of concrete you will get from the cement, sand, and aggregate, add the volume of each ingredient, then multiply the total by 0.85 (85%). The volume loss is because the sand fills in the spaces between the units of the aggregate and the cement fills in the spaces between the grains of sand. For practical purposes you can discount the volume of the water.
Stan
nteresting.(quoted from post at 21:23:35 05/25/18) JMOR; No, a cubic foot of cement is 94 lbs. We don't have to argue about it, though. You're on the computer; Google it.
Stan
Google it.
Stan
maybe if we fluff it up more, we can make a bag easier to handle at 75 pounds.(quoted from post at 12:21:42 05/26/18) JMOR; I found the answer. The specific density of cement as packaged is 1.44 g/cc because it includes the air voids. The figure 3.15 g/cc is for cement that has been compressed until it contains no air voids. I wish I could say that I figured this out, but it's information I found. Persistence is good, too.
Stan
Specific gravity of cement
(quoted from post at 14:57:33 05/27/18) Weight
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