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Concrete is one of the most durable materials of construction. However, because concrete is inherently porous and alkaline, it can be attacked both physically and chemically by certain injurious solutions including acids, salts, and water. Penetration of concrete by water or injurious solutions is especially severe where the concrete is exposed to alternate cycles of wetting and drying or freezing and thawing, or both.
Construction materials consultant, Augusta, N.J.