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RE: Reinforced Concrete Block

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Title: RE: Reinforced Concrete Block

COE criteria calls for only diagphragm chord to be reinforced across these joints.  Is the joint for thermal expansion along a lengthy building or is this a shrinkage crack control device for the concrete masonry?  Either way, the criteria would be the same, but the term "expansion" joint is not necessarily consistant with what concrete masonry actually does over time.