Save Money! Save Time! Rock Splitting, Concrete breaking and mining, stone quarrying has never been easier with Dexpan Expansive Grout, successfully used in hundreds of projects ( see galleries below ). Dexpan is a powder with amazing 18,000 psi expansive strengh when mixed with water. Poures into pre-drilled holes. Dexpan can break concrete and rocks safely and quietly, while providing silent cracking. It is safe, easy and cost effective.