hollow concrete block

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hollow masonry unit

hollow masonry units
A masonry unit whose net cross-sectional area in any plane parallel to the bearing surface is less than 75% of its gross cross-sectional area measured in the same plane.
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Briefly, hollow concrete blocks were placed on the ground and then untreated southern pine sapwood stakes (19 by 19 by 200 mm long) were driven into the ground to create pathways for termites to explore upward onto the concrete.
Labour-intensive processes to create maximum employment meant that all components for the 1,176 low-level buildings, prefabricated RC beams and 24 million hollow concrete blocks were handmade on site.
He has found that the gas permeability of hollow concrete blocks can vary by as much as a factor of 10 depending on how they were made.