ASTM WK74033

    Revision of C1670 / C1670M - 19 Standard Specification for Adhered Manufactured Stone Masonry Veneer Units

    (What is a Work Item?)

    Active Standard: C1670 / C1670M - 21a

    Developed by Subcommittee: C15.03 | Committee C15 | Contact Staff Manager



    WK74033


    Keywords

    adhered; cementitious; concrete; manufactured; manufactured stone; masonry; veneer;;

    Rationale

    ASTM C1670 contains requirements for frequency of testing for a variety of physical properties. Currently the standard requires the following tests at the following intervals: 12 months compressive strength, freeze-thaw, shear bond, dimensions, weight per square foot 24 months linear drying shrinkage This ballot proposes to change the testing frequency for freeze-thaw and shear bond to 24 months. This is consistent with a variety of other concrete masonry standards (C1372 for SRW and C936 for paving units require freeze-thaw every 24 months) and is more appropriate for these properties. It is important to note that the standard still requires testing if there is a change to manufacturing process, materials or their sources, concrete mix design, production methods, and curing methods. Regardless of timing, if there is a change to any of the items listed, new testing will need to be performed. No changes are proposed to the testing intervals for compressive strength, dimensions, weight per square foot, or linear drying shrinkage. Therefore, the manufacturer has indications of consistency in production through those tests. It is very likely that if similar results are obtained through compressive strength and weight per square foot testing, the production variables have remained consistent, and testing for additional properties is not necessary at the same interval. The manufacturer, obviously, can test their product at closer intervals as well.

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    Work Item Status

    Date Initiated:
    09-03-2020

    Technical Contact:
    Nicholas Lang

    Item:
    018

    Ballot:
    C15 (21-01)

    Status:
    Ballot Item Approved as C1670/C1670M-2021A and Pending Publication