What Is the Difference Between Cinder Block or Concrete Block?

Some construction projects call for a larger masonry block than a standard brick, but solid can be very expensive and very heavy. One common compromise are largely hollow masonry blocks known as cinder blocks. These are also sometimes referred to as concrete blocks, breeze blocks, or concrete masonry units (CMUs), though these terms have nuanced differences among them. Cinder blocks are generally lighter than solid concrete blocks, which makes them easier for brick masons to place in position. The hollow spaces in the blocks also provide some natural insulation or allow grout to be poured inside the rows of masonry.
differ from concrete blocks in other ways besides their hollow design. Concrete blocks are made from a slurry of Portland cement and small aggregate, such as small stones or gravel. This makes them heavier and smoother than cinder blocks, which are made from a combination of Portland cement and cinders, the dusty remnants of burned coal.

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