@zander I will try and make a video on my next attempt. I just built a work bench 4ft x 8ft x 3/4 ply. I am hoping that will be a stable enough surface.
It may be a few weeks though.
Look forward to hearing any feed-back from my pics and/or video.
Yes, even the lightest weight AirCrete will resist rodents. You can easily make it denser by add less foam. or you can use a 1/1 sand/cement mixture.
AirCrete is much like concrete in relation to moisture. It does absorb some moisture on the surface if it isn't sealed. any good sealer should be effective with AirCrete
@K2 You are completely right in your assesment. You also have to take into consideration that this is something that was built in Philippines. I guess they did not require engineering specs there and that it have been built like an accessory building. This is akin to the mini house movement, that is not allowed in many states because of regulations. I guess a real solution lies somewhere between this foamed celular concrete and a better reinforced version. This mix should have some sand, and be made with magnesium oxide concrete, which is stronger. I would also look for a better foamer that is more stable and last longer and reinforce with basalt rebar to avoid rust in the future. As I have said before, a sandwiched structure with the celular concrete in the middle, then an external layer of regular full strengh shotcrete and an internal layer of magnesium oxide cement would make for the ultimate structure. When I finish my test subjects I will send them to an engineering firm to do a proper compression and tensile strengh test and post some results. I have too many projects now but will definitely share when I finish mine. The ones they do use a fiber to reinforce the celular concrete,but still it would need a proper test to get to final numbers. I think this type of material is stronger than wood, but not stronger than regular concrete. Eventually I will have my answer and will share here.
You can use foamed concrete for insulation, but I'd be sure you have a structural engineer check the design of any load bearing foundation. You'll be ok with enough surface area and strong enough beams to transfer and spread all the forces over the foamed concrete, but you need to design this.
Joe is correct, you do not need an autoclave for foamed concrete. There are concrete blocks and other shapes that are available in autoclaved cellular concrete - they have higher strength than what is generally made using foamed concrete.
NO. You'll have very, very low strength. You need to use portland cement. You can and should use fly ash in your recipe (your mix design to concrete people). Fly ash is a polozan - the secret of the Roman Empire. That's why a lot of their buildings are still standing hundreds of years later.
Your mix design is critical for a lot of reasons. You need strength, you want low shrinkage, you don't want your concrete to constantly be shedding dust, you don't want the surface to pop loose, and a lot of other things. Get a good mix design before you start! Pay very close attention to water cement ratio! Too much water will ruin your mix. It is best to do a lot of reading about foamed concrete before you begin. You don't want to build a nice looking structure, only to watch it crumble over time.
I wouldn't use foamed concrete for a floor surface, as it is not strong enough to withstand the wear a floor gets. You don't want to have chair legs digging holes in your floor. I would suggest that if you poured a thick layer (15 cm or 6") of foamed concrete, then poured a 5 cm or 3" layer of 4000 psi concrete over the top, you'd have a good surface with insulation from the ground. I would not use foamed concrete in any load bearing portions of the floor! Your structure needs to be sitting on hi strength concrete or something that will hold the expected forces that the foundation will see during the life of the building. If your foundation is not strong enough, it will crack and shift, which will crack and shift the whole house.
Awesome! When I get back to work next week I want to order a block as well so I can look at it and dream of when I eventually build my own home. I'm homeless but live on the semi I drive and make very good money.
Sounds like a great idea, but I dont see that the airkrete and the aircrete(domegaia cellular concrete) have the same consistency. What seem to make airkrete an insulator is the magnesium concrete properties. Portland cement behaves differently. The aircrete or cellular concrete mixture that is shown on the domegaia videos looks much denser than that foam of the airkrete company. Since they are 2 completely different products then you may need to contract someone that is a specialist in airkrete. I guess you could inject cellular concrete by yourself, but you would have to use a different formula and experiment to get to that foamy consistency of the airkrete.com website. You wont have the same properties, though. The magnesium concrete absorbs CO2 while its curing and cures much faster than cellular concrete. I have not seen anyone successfully spray the aircrete on the domegaia videos or cellular concrete in any other video. The spraying process would surely kill the foaming that you had to achieve to get the aircrete. Spraying requires going to a fine nozzle under high pressure and the airkrete you are talking about is already a foam that is "injected". Check this : http://www.greenhomebuilding.com/QandA/manufactured/magnesiumoxide.htm