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Dec 15, 2001 · Concrete Classics. Posted on December 15, 2001. New Slab on Top of Old. By Concrete Construction Staff. I recently poured a 30x50foot pad that has cracked very badly. The pad had no... More. Tags: Spalling, Concrete, Joints, Cracking and Crazing, Concrete Expansion. Posted on June 01, 1972.