Revision of C490-07 Standard Practice for Use of Apparatus for the Determination of Length Change of Hardened Cement Paste, Mortar, and Concrete
Revise section 6.2 and 6.3 to better define the frequency of reference bar use related to temperature conditions of the comparator and room. Revise section 5.3.3 and add a description of the tips of the reference bar.
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