Penetration, Scabbing and Perforation are the basic elements of designing protective concrete structures against the impact of hard projectile. Vital structures such as nuclear plants, power plants, military structures, weapon industries, weapons storage places, bunkers, water retaining structures (dams, barrages, etc.), chemical and local industries, highway and railway bridges, tunnels, flyways, barriers etc have to be designed as self-protective structures against impact loading generated by natural disaster (tsunami, hurricane, tornado, wind storm, sand storm and earthquakes etc), consciously engendered unpleasant incidents (terrorist attacks etc), against accidentally occur incidents in nuclear plants, weapon industries, weapon storage places, local industries, and collision of air crafts, buses, trains with buildings, etc. Impact energy is the dominant cause of damage in dynamics. When hard projectile collides with concrete slab, it is the impact energy of the projectile that makes concrete slab to deform. Therefore, this book is curiously focused on the required critical impact energy of Hard Projectile causing Penetration, Scabbing, and Perforation of Concrete Slab.