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Yes, but it will be better if you add gravel. Beware of leaks due to gravity. Install rebar or something like that in the mix before it sets. The mix itself is not strong enough to bear its own weight without interior support. Press some strong mesh into the exterior while it is still wet to the touch. Seal it properly. Be sure to take weather and humidity into consideration when choosing your day to begin. Start on a mild but warm day and pray you don't get a serious rain until it's at least set up.
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