Find Compound to Break Super Concrete Slab

[Rensslin]

So I have a slab made out of super concrete. I drilled holes for something that will expand and pop the slab. But the product for sale is outside my budget for 50 x as much as I need.
Does anyone know a compound that will slowly react to expand forcefully enough to break up the slab?

 

[mfb]

It depends on your sample.

Did you try freezing water? Extremely cheap and quite powerful.

 

[Borek]

Put a piece of dry wood into the hole. That was the method ancient Egyptians used in their quarries (you never know when all these strange readings will pay off).