@Kwagga Of course they would leak if not sealed.
Posts made by HandyDan
RE: Average Cost Per Sqft
120 Square feet done
(120/3.1428)Square Root=radius 6.18. A 12.36 foot dome
The cost for foundation and done would be $835 ish dollars if you make it 12 foot at 4.5 inch thick walls.
44 bags of cement
3 gallons of Drexel foam agent
1 roll of soft polyester.
RE: Average Cost Per Sqft
@Kwagga 42 KG of cement makes .17 cubic meter of AirCrete.
There is some data required to make a metric version:
What price & volume of foaming agent is used there.
Weight & price of Portland cement bags.
Dimension and cost of soft poly reinforcing fabric.
RE: aircrete vs. ferrocement
Is Aircrete strong enough, can you walk in it..
If my entire 24' dome was the wet mixing weight it would be 55,800 pounds. Divided over the area of the
8" thick dome wall is only 7.5 pounds per square inch.. Now cure out the water weight and consider that my test samples cure out stronger than 160 psi at 30 days... Yeah it's strong enough to walk on and not going to fall over...
Now considering the tensile strength of the fabric at the equator.. Apoc 482S is rated 35 psi.. The circumference is 904 inches. The total tensile strength is 31,667 pounds. Using g a fabric rated 90 PSI would yeild 81360 points of tensile strength. Now how much weight of the structure transfers through via compression and how much stress is actually put on the fabric... I have no idea...
RE: A few newbie questions
Your 25' dome will weigh 51,045 pounds soaking wet. A 6 inch thick block will be holding 8.85 pounds per square inch not accounting for the arch taking some load. No problem for aircrete.
At 4" thick:
Dome wet weight: 39489.5
Pounds/square inch: 10.33
My blocks tested over 167 psi before falure at 30 days. My scale would not go any higher so I don't know what the actual strength was.
I'm really not sure what the strength is at 24-48 hours, but you could test one.
I would say the secondary consideration for thickness is insulation value. You want to design an energy efficient house. That can be achieved with block thickness alone or with added interior insulation.
RE: tutorial video for little dragon construction
@damian the pump and solonoid valve can be wired up either way. You can't get that wrong. You basically connect the air valve and the pump wires together. Connect one leg directly to the power cord and the other wire goes through a switch it's way to the ramining cord wire. Ground(green) wires if any are all tied together. The air valve outlet & water pump go together into a single tube where the air and water flow together into the wand. Don't over think it and I'm sure you will do fine.
I will be putting up a blog post as soon as I get time to edit some video about building a foam machine. If you want to be notified when this post goes up Subscribe to this list: https://upvir.al/56817/lp56817
RE: To what temperatures does Aircrete remain fireproof?
@Doc I would say no. I don't have experience with magnesium cement. Further, adding aggregate will collapse the mix. So I thinking refractory air cement is not possible unless you make it with lye and aluminum powder, but then it's not aircrete and doesn't require the little dragon.
However, after the structure is up you could paste on lava stone or actual refractory cement. If fire is the primary design consideration then perhaps an underground structure is the better option or tall earth berms. You could also engineer a battery, pump, water tank sized to burn times and BTU exposure and spray cool it.. Live in field..
I suspect that are aircrete would actually survive a fire but even if it didn't the whole point of all this is cheap housing right?
Now I'm rambling...