Sorry to start a new thread for a simple question, but it has to be done. I used to get very good grades in math, but apparently all that pot I smoked in high school erased my ability to calculate the volume of a cylinder.
I need to order concrete to fill some pilings at a site. I have 6 pilings that are 5 feet deep and 16 inches in diameter.
I know that the formula for volume is pi r squared h. I have imperial measurements, but need to order the crete in metric.
I first calculated that I needed 11 meters, but refused to believe it, then I calculated that I needed 4.7 meters, but that seemed too much as well. Turned out that I was using diameter instead of radius. I now have it calculated to be just under 2 meters.
WTF happened to me? This is embarrassing asking for help on this, but it'll be doubly embarrassing if I order way too much or way too little.
So, fine folks of cp, how much crete do I need in cubic meters?
After I have a consensus on the volume, we can let this thread degenerate into a 4x4 mockfest. Or we can discuss how funny it is that something so simple can be forgotten so easily.
Plugging that in ((pi*r^2)*h)*6 = 1.186 cubic metres (I hope)
__________________
"The problem with any ideology is that it gives the answer before you look at the evidence."
—Bill Clinton
"The greatest obstacle to discovery is not ignorance--it is the illusion of knowledge."
—Daniel J. Boorstin, historian, former Librarian of Congress
"But the Senator, while insisting he was not intoxicated, could not explain his nudity"
—WKRP in Cincinatti
__________________
"The problem with any ideology is that it gives the answer before you look at the evidence."
—Bill Clinton
"The greatest obstacle to discovery is not ignorance--it is the illusion of knowledge."
—Daniel J. Boorstin, historian, former Librarian of Congress
"But the Senator, while insisting he was not intoxicated, could not explain his nudity"
—WKRP in Cincinatti
I wonder if any of us could have done this without the internet though? Pretty sad, really...I used to be able to do all this unit conversion on paper.
Yeah, I'm getting 1.2 meters by that calculation. That seems way too little.
1.2 cubic metres is a lot, a 4' x 4' x 4' box.
__________________
"The problem with any ideology is that it gives the answer before you look at the evidence."
—Bill Clinton
"The greatest obstacle to discovery is not ignorance--it is the illusion of knowledge."
—Daniel J. Boorstin, historian, former Librarian of Congress
"But the Senator, while insisting he was not intoxicated, could not explain his nudity"
—WKRP in Cincinatti
Location: Close enough to make a beer run during a TV timeout
Exp:
Yeah, that is an odd amount of concrete to order; too small for most companies to deliver and too big to do it in bags. If you have a solid enough truck you might want to look at these guys:
Ya, 1.2 meters is kind of a awkward amount to order.
I'm not sure what the application is, but you may also want to consider getting sulphate resistant cement (depending on soil and ground water conditions). If the piles are exposed to the elements (moisture/ freeze-thaw cycles) you should also specify 4-7% air entrainment. These two modifications are relatively cheap and improve long term durability of concrete. Ask your supplier if they think it's necessary.
