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Crystalline deposit of salts, formed in the surface of walls, specially in humid, warm and nitrous places.
Air bubbles intentionally incorporated in mortar or concrete during the mixing operation, usually using a chemical agent.
Concrete with very small air bubbles, incorporated to concrete through an admixture during cement manufacture or during dosage and mixing of normal concrete. The purpose is to increase workability, durability and to improve resistance to freeze.
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