Say, theoretically, that I had a lot of big chunks of concrete that I wanted to turn into a lot of little chunks. I know pounding on them with a sledge hammer would accomplish this, but is there anyway to 'tenderize' these chunks before pounding? Any possible chemical application or process that would weaken the cement bonds? Could intense heat work? If so, how high would the temperature have to be and for how long would it have to be applied?