Thank you for your reply. Very helpful. I was more concerned that it would start to set up before I finished filling the entire form so a three or four hour window is more than enough. Will be doing this in 60 to 70 degree weather so should have plenty of time. Appreciate your help.
I am designing a Nubian arch aircrete modular dome system. I have very limited resources so I came up with a design which lets me build a "room" to live in and then add "rooms" as needed. I have a solid modeling program which lets me build an exact model and it gives me total cubic inches and other info. I made a spreadsheet using all the data I could glean from the DomeGaia sight and I get this
0_1512618013986_upload-05b229f1-6289-4df3-aee3-932a5f5fe192 Cubic '' Cubic Feet "Bags of
Portland (94lbs) " "Water
gallons per Bag Portland" Price
5.5 7 $10.03
5.5 Foundation 183504.8492 106.2 19 135 $193.66
5.5 Floor 140853.8957 81.5 15 104 $148.65
5.5 Entrance/Shell 814940.051 471.6 86 600 $860.04
Stucco Finish 0.0 0 0 $-
120 839 $1,202.35
This is just the Portland cost. I have not figured out how far the Drexel or Dawn dish soap goes.
Air Crete is porous and will absorb water so you would have to finish the surface. Due to the low tensile strength of aircrete you would have to add a lot of rebar or better yet fibers if you want an above ground tank. I have not tested it for water retention on its own but am building a turtle pond that will be finished with a tadelakt (lime based) top coat.
No it is not up to code in the US. In order to get it up to code you would need to talk to an engineer. maybe do a small scale test build before he will his stamp of approval on it, before you can build in the USA.
Inflatable form is the least labor intensive way to go i believe.
To test if the air-crete stands up to the height, Use a form as high as the top of the construction, 16 Ft in your case, for example a box of 4" square and pour the test mix in this. Test the bottom but the same way you test the top bit and you know the difference.
glad to read your post. I'm currently in Kona. Till 16 Oct. Will be in Kauai for a few days after that. I have 8.2 Acres in San Diego County. I can provide space for workshops in San Diego. I have 30+ years of construction experience. Love to meet with you while I'm among the islands.
I am building 21' dia. Nubian domes. Think the shape of the large half of an egg. 4" thick blocks, fabric wrap with earth plaster inside. Probably 6"x6". I would really like a form which created the horz/vert angles but since I received the Aircrete "mortar" formula just using square cut blocks as shown by dome Gaia might work as well. My thought is that if I have the angles I would use less material. I will be documenting all of my procedure so anyone helping can benefit as well. I suppose it will end up being cost/benefit. I know there are some smart innovative souls in the forum. So throw out some ideas for all to tweak.