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SLAB AND FLOORS CRACKS AND CRAZING,.. Web  Cracks form in a slab when there is a tension force in the concrete that’s greater than the concrete’s strength in tension..

SLAB AND FLOORS CRACKS AND CRAZING,.
SLAB AND FLOORS CRACKS AND CRAZING,. from i.stack.imgur.com

Web  Despite their apparent hardness, concrete slabs are actually more porous than you think, and over time, water can penetrate the slab.