Designing a Home using poured AirCrete for the walls
I have recently purchased property in Ecuador in the town of Cotacachi. I was a builder previously while living in the USA. I am designing an elongated Octogon with three bedrooms and a bathroom extending from the Octogon. I plan to have all vertical 8’ walls poured into forms between concrete and steel posts. In order to get a permit to build this way I need specifications on AirCrete. In theory this method could revolutionize the building industry allowing more conventional type homes to be built at a greatly reduced cost. Please could someone steer me to links that have test studies on AirCrete.
Also I was going to use textile cement products for the roofing using wooden rafters with acrylic fabric secured onto the roofing members and an acrylic cement mixture applied with another sandwich of acrylic fabric to about an inch thick. Is there any way I can incorporate AirCrete with this? The problem on a roof is that AirCrete would run to easily to apply.
Hi Jim, Hola: The first thing you would need to understand is that aircrete is a commercial name for another process that involves aluminum powders and autoclave oven to do the finished product, which have higher compression and tensile strenghs than what you would do with just soap. A better name for the type of block that domegaia builds would be cellular concrete. It also depends how your local office works. If they only want enginnering data to approve and they are not going to actually test or see the process, then you can get that information online from different companies brochures. Now if you want the real data, you need to fabricate a cellular concrete block and send to a local engineering firm to be tested , normally it will require 4 or 5 blocks and the test can take up to 60 days. Then you can use those numbers for the county. Domegaia do not sell a block with engineering data. They sell a method and the tools to get it done.
Since you are using an octagonal form, a good way could be to fabricate triangles with cellular concrete using the domegaia method and put a lath mesh in the middle on the triangle before pouring and extend this mesh outside of the triangle area. Then you can put these triangles together and build a geodesic dome. You could build a wood geodesic dome frame and use it as support, then when the triangles are in place, put rebar rings to hold the triangles together using the lath mesh, and then fill up the sems with either cellular concrete or just a stronger regular concrete mixture. You can them remove the wood frame from the inside and have spray or install inner insulation and stucco to your needs. This is how geodesic homes of Florida do them, but they do not use aircrete and their triangles have the insulation glued to the concrete triangle. Look at this page so you get an idea:
Another idea for you is that instead of using regular portland cement, you use magnesium cement, which is much stronger and then you can make thinner walls but with the same strengh. Magnesium cement is much more expensive than portland, but then again it gives so much strengh that you maybe could combine it with portland and get a happy medium. I hope this helps. Happy building.
Hi, besides the use of magnesium concrete. What would be the best fiber to add to cellular concrete, in which proportion?
Not sure how these guys do it, but they are making awesome straight walls out of aircrete. This company uses the Little Dragon. I suspect they add sand to the mix.
@Jim-Daubert hi! it might not be relevant any more (old question), however others might find it relevant.
In Sweden (Europe) there is a company that sells proffesional equipment and non toxic foaming agent called Aercell A-7. See http://www.aercrete.se/20-2/ for more info...
Above product is used by another company that performs construction work and has a data table with ratios of ingrediens and compression strengths. It's in swedish but use google translate...
Also see a video clip!
I'm not associated with those companies... nor know anything about Aercell A-7 foaming agent, but you could contact them... I have a nice home already, but I might be interested in this technology if it can be delivered in a turn key project for nordic climates too, and would than really drill down into agents nature.
Good luck with your project!!