Aircrete is collapsing
I have had difficulty creating long-lasting foam using the seventh generation dish soap. The aircrete mixes well and pours with a light velvety texture, however after about 20 minutes in the mold, it starts to rapidly collapse, within a minute or two, down to half of its poured volume.
I am using the ratios found on the website:
Little Dragon 5-gallon Bucket
Aircrete 5-gallon Bucket (added in this order)
-10.5 lb portland "low alkalai type II/V" cement
-6.3 lb water
Concrete Slurry is mixed thoroughly
-rich hearty foam @~60 psi is added to fill up the rest of the 5-gallon bucket
Aircrete Slurry is mixed thoroughly
This mixture is about 1/3 concrete slurry and 2/3 foam, per one of domegaia's videos.
This same mix and procedure had worked out for one batch in the past and it hasn't worked since. Maybe because that was on a somewhat hot day (85 degF), it is colder now (60 degF), do you think that temperature difference would create such a drastic change in aircrete formation? I cant think of anything else that would be different..
Any advice is appreciated. Thank you!
^^some examples of aircrete collapsing. that aircrete shown in the cardboard box was filled to the brim. and it collapsed more than half the height! any tips come to mind?
I doubt it has anything to do with the temp. When it collapse like you discribe it is almost always caused by the wrong foam density. Do you have a good scale? The foam should weight between 80 - 100 gram/lt
or 3 oz/qt.
Make sure the foam density is correct and please let us know how it worksout.
Make sure the foam density is 80 - 100 gr/lt (3oz/qt) then let us know how it works.