Temperature should be on the bag. Usually 50-90 as I recall.
I calculate you are wanting to pour 1680 cubic inches or 70 cubic feet. A bag has roughly .375 cubic feet in it so that would equal 186.6667 if you have no loss so should be able to pour with 190 to 200 bags. Hope this helps. 18 x 4 x 1680 = 120,960 cubic inches 120,960 / 1730 = 69.9 cubic feet 70 cubic feet / .375 cubic feet = 186.666667 bags
I doubt that you'd be successful as the water to concrete mix ratio would be way off. The mix would of course displace the water but the strength of the concrete would be significantly reduced. Get long footing forms that can go all the way to the bottom and drive them into the dirt and try pumping the water out. The tubes will need to be strong enough to withstand the head pressure. The deeper the water the stronger the tube/form will need to be. good luck.
You can. It does set up pretty fast. If you are working with a few bags you should be fine. If it's a bigger project you may want to use a mixer or use the regular concrete mix.
One sb enough but if you are short bulk it up with some rocks.
Those measurements give you about 5.33 cubic feet to fill. Each bag is about 0.35 cubic feet so you would need 5.33 ft3/0.35 ft3/bag = 15.22 bags. Go with 16 better to have more than not enough.
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I used 5.5 bags for 7x5, about 2.5in thick. Hope this helps.
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