Block, and the base materials that block are made of, must meet all of the requirements of ASTM C90. That is pretty much all there is to it. C90 references all of the other ASTM Standards that tie in so C90 is your starting point. All the ASTMs regarding block are contained in Volume 4.05 which you can get free when you join ASTM (if you are not already a member).
Feel free to ask questions as you go through the standards governing block. We have a two day workshop, which HEAVILY covers all of the governing ASTM standards, coming up on May 20th and 21st (Friday and Saturday). Our presenters are the most knowledgeable professionals in Florida on this very subject.
More information on the workshop is available on www.masonryworkshop.com
Jerry Painter, FASTM
Don Beers, PE, GC
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