Here are several options. Make sure you are mixing the right formula for your application. If mixing a large quantity, do yourself a favor and rent a mixer from any tool rental.
The mixture itself depends on which product you are using, and you should follow the instructions. As far as how to mix it, it depends on how much you are mixing. If you need a lot, consider hiring someone to help with job or renting a mixer.
There is a molding being sold in England, at least, called Wood U Bend. It can be heated to allow bending. I have not yet found a source from which to get it in the U...
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https://www.quikrete.com/athome/video-mixing-concrete-hand.asp
If you are using "ready mix", just follow the ratio on the bag for water/ready mix. If you are just using plain Portland cement you will need to add sand and "aggregate" (usually gravel). Here is a link: https://www.familyhandyman.com/masonry/pouring-concrete/how-to-properly-mix-concrete/view-all/
Here are several options. Make sure you are mixing the right formula for your application. If mixing a large quantity, do yourself a favor and rent a mixer from any tool rental.
https://www.quikrete.com/athome/video-mixing-concrete-hand.asp
https://m.wikihow.com/Mix-Cement
https://www.doityourself.com/stry/how-to-make-concrete-mixing-ratios
http://matse1.matse.illinois.edu/concrete/bm.html
Well that depends on how big your project is and how much cement you are mixing
The mixture itself depends on which product you are using, and you should follow the instructions. As far as how to mix it, it depends on how much you are mixing. If you need a lot, consider hiring someone to help with job or renting a mixer.