I am curious as to what pumping air into the concrete does. I am getting ready to pour some concrete. Should I know about this before I start the project? ----- Original Message ----- From: "Tony Smith" To: "'Microcontroller discussion list - Public.'" Sent: Tuesday, August 15, 2006 10:03 AM Subject: RE: [EE]: advice on blowing bubbles >> > >Other thoughts: >> > >Concrete containing expanded polystyrene (styrofoam) is already >> > >fairly common. >> > >Maybe you could just add some baking soda to your concrete? ;-) >> > >> > Well, I was thinking of ping pong balls ... >> >> Or just lay perforated plastic pipes at the bottom, and pump >> air in so that it bubbles up into the setting concrete - it >> works with Aero chocolate! :-) >> >> Cheers, >> >> Howard Winter > > > I went to the Aero bar factory once. Apparently they use a vacuum to get > the bubbles. Same technique as getting air out of silicon molds, put it > in > a vacuum, bubbles expand and pop. Except with silicon you try not to get > too many bubbles in the mix in the first place. > > Apparently the trick with Aero bars is getting the vacuum just right... > "Aero Bar" - now with 50% British air! > > Tony > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist