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Concrete Masonry Unit

August 26th, 2011 Concrete, Construction, Masonry

Concrete masonry units (CMU) are made from a combination of cementitious materials, aggregate, admixtures, and water. Materials are mixed at the block plant, placed into molds, and vibrated. Very dry mixes are used to permit rapid mold stripping. Concrete masonry units are cured at the block plant to ensure proper hydration of cementitious materials. CMU may include pigments for color variations or integral water repellents.

Concrete masonry units are manufactured in a wide range of sizes and configurations, to be used for masonry veneers and load bearing or reinforced masonry construction. Hollow units for reinforced masonry have a standardized length of 16 inches and a height of either 4 or 8 inches. Through-the-wall thicknesses are manufactured to be 4, 6, 8, 10, or 12 inches. Actual CMU sizes are slightly less than the listed nominal sizes to account for a 3/8” mortar joint thickness.


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