hi there!
Here is a trick i stumble upon, how to shutter wall quickly without any effort 
1)first cell fracture the wall or object
2)animate impact object
3) make impact object as animated rigid body
4) next in scene properties, rigid body world animate rigid body world speed to 0.00(means rigid body world is off) and when impact object collied the wall keyframe it to 1.00 so until object has reached wall no fracturing happens in world 
here is small screenshot tutorial , fast, easy and awesome
any questions ask ! and good luck exploding stuff easy way