Water chemistry has a lot to do with concrete! Ignoring your water chemistry when mixing any concrete is an invitation for disaster. Sulfates in your water or aggregates in any portland cement mixture are really bad. Here's a link to more information on concrete and sulfates: https://www.understanding-cement.com/sulfate.html#
Best posts made by K2
RE: Aircrete is collapsing
RE: Pour in place of a vertical wall section
Are you designing this wall to hold back earth? Do you know what the forces are on the wall? AirCrete is not as strong as normal concrete - probably will be 1/10th the compressive strength of low end 3000 psi concrete.
Retaining walls need steel reinforcement also. Concrete is only good in compression, and your AirCrete will have about 300 psi of compressive strength, if you get the water cement ratio optimized.
If your wall is not strong enough, you will soon develop cracks, and the wall will eventually come tumbling down. Better to check with an engineer or architect to see that your design is correct before building.
lowering the water cement ratio
Wouldn't lowering the water : cement ratio be very desirable for airCrete? I think this is your recommended mix design (recipe):
94 lb portland cement
7 gal (58lb) water
mix these two together in a 55 gal drum, then add:
~37 gal of foam (at 3 oz/quart density) = 28 lb of water
total water in this mix design is 58+28= 86 lb
water cement ratio is 1:1.1 or 0.9
Concrete made with a water cement ratio this low is on the order of 3 to 5 times weaker than a 0.4 ratio, which is considered close to optimal in concrete design. It would seem to me that lowering the w/c ratio to something at least near 0.5 would be very beneficial. Can this be done with superplasticizer (a common add mixture for concrete work)? What are the drawbacks of superplasticizer in AirCrete?
RE: Dome form reference in video
I'm also interested in reusable forms for dome home construction. I also would be interested in an engineered design for a home that could be replicated to help spread the cost of design. The cast in place textured ceiling would be awesome!
RE: Local Building Codes
To build a home in most parts of the US, you will need to meet the building codes for that location. If you ever want to sell your home/building to anyone who will need to get a loan, you will need to have built it to codes and have regular inspections during the build process.
You will definitely need to have the plans approved (stamped) by a registered professional engineer (should be a structural engineer).
One issue that looks to be very important in building with this material is quality control. The water : cement ratio is very important to the quality of the concrete. Too much water and the strength is very low - causing the structure to crumble. The building inspector may require test to be done to verify that there is adequate quality control. If you are building a home for someone to live in in the USA, you'll want that quality control to insure you're not constructing a problem home that could ruin your reputation.