Transcription of ASTM C90, Standard Specification for Load-Bearing Concrete ...
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ASTM C90, Standard Specification for Load-Bearing Concrete ...
Standards for Concrete Masonry UnitsASTM C90, Standard Specification for Load-Bearing ConcreteMasonry and solid loadbearing Concrete blocks are coveredin this Standard . Weight classifications are divided into Light Weight (lessthan 105 lb/cu ft oven dry weight of Concrete ), Medium Weight (105 to lessthan 125 lb/cu ft), and Normal Weight (125 lb/cu ft or more). Unit weightaffects water absorption, sound absorption, sound transmission, and thermaland fire resistance. There are no default requirements in astm C90, so thespecifier must designate unit type and weight classification if these proper-ties are important to the minimum net areacompressive strength required for all threeweight classifications for astm C90 loadbearing units is 1900 strength is largely a function of the characteristics of the aggre-gate used in the units, and may vary regionally
17.5.2 Standards for Concrete Masonry Units ASTM C90, Standard Specification for Load-Bearing Concrete Masonry Units.Hollow and solid loadbearing concrete blocks are covered in this standard. Weight classifications are divided into Light Weight (less than 105 lb/cu ft oven dry weight of concrete), Medium Weight (105 to less
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