Load bearing concrete masonry unit can be manufactured as either moisture-controlled (type I) or non-moisture-controlled (type II) units. Generally, the shrinkage of type I concrete masonry unit is limited.
Moreover, concrete
masonry unit can further be categorized into grades N and S.
Grade N denotes a
unit is suitable for the construction of exterior wall for its high strength
and resistance against moisture penetration and severe frost. On the other hand,
grade S unit possesses moderate strength and resistance to those actions.
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