Five For A Change is a Not-For-Profit that believes in helping people by freely sharing information on how to do a lot of things. If you like what we do, please consider a donation to help us keep doing cool things.
This is a quick tutorial on how to build a simple DIY Aircrete Machine.
Just note that you can use whatever parts you want but below is a list of the parts I used.
1 1/2 in PVC Pipe (you'll want at least 48 inches of PVC)
Pour tube about 6 inches
Back tube about 5 inches
Front tube about 15 inches
Tube for the gun about 15 - 20 inches
4 - 1 1/2 in PVC Caps
1 - 1 1/2 in Tee connector
1 - Female to Male connector
Male part being threaded
1 - 1 1/2 threaded cap (screws onto the male part of the connector)
3/8 in (inside diameter) x 1/2 in (outside diameter) clear vinyl tubing
.170 in (inside diameter) x 1/4 in (outside diameter) clear vinyl tubing
5 - 3/8 in (inside diameter) x 1/4 in MIP Hose barb adapters
2 - 1/4 in (inside diameter) x 3/8 in MIP Hose barb adapters
1 - 1/4 in Female to Female brass ball valve
1 - 1/4 in (outside diameter) Polypropylene Push-to-Connect Valve
1 - 3/8 in (inside diameter) Plastic Hose Barb Tee
1 - 1/4 air hose connector
1 pack of stainless steel wool (so it doesn't rust in the tube)
You can watch the video below to see how to put it all together.
Suggested Tips By Blindorize on YouTube when creating your aircrete mix.
The foam needs to be as thick/dense as possible, like shaving cream. If it's airy like that then the cells are too big and not nearly dense enough to hold your cement together. You can try Dawn or 7th Generation soap from any store, or order Drexel Foaming Agent if you're close to a Rural King.
The proper cement to water ratio is crucial - most are finding that 6 gallons of water per 92lb bag of cement is about right. That comes out to about 8.1 oz of water per pound of cement.
Have the foam gun primed and ready BEFORE you mix the cement slurry. You'll want to add the foam in to the slurry immediately.
Your initial goal should probably be to double the volume of your cement. That means in a 5 gal bucket, fill it about 1/3 full of cement slurry, then double it with (high quality) foam.