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[OSHPD 1R, 2B & 5] TMS 602, Article 1.4 B Compressive strength determination. Modify TMS 602, Article 1.4 B as follows by adding:
5. Additional testing requirements:
  1. At the beginning of all masonry work, at least one test sample of the mortar shall be taken on 3 successive working days and at 1-week intervals thereafter. Where mortar is based on a proportion specification, mortar shall be sampled and tested during construction in accordance with ASTM C780, including Annex 4, to verify the proportions specified in ASTM C270, Table 2. Where mortar is based on a property specification, mortar shall be laboratory prepared and tested prior to construction in accordance with ASTM C780 to verify the properties specified in ASTM C270, Table 1 and field sampled and tested during construction in accordance with ASTM C780 to verify the proportions with the laboratory tests.
  2. Samples of grout shall be taken for each mix design, each day grout is placed, and not less than every 5,000 square feet (464.5 m2) of masonry wall area. They shall meet the minimum strength requirement given in ASTM C476/TMS 602 Section 2.2 or greater as specified.
  3. Additional samples shall be taken whenever any change in materials or job conditions occur, as determined by the building official.
  4. Test specimens for mortar and grout shall be made as set forth in ASTM C780/C1586 and ASTM C1019. When the prism test method is used in accordance with TMS 602, Article 1.4 B.3 during construction, the tests in this section are not required.
    Exception: For nonbearing non-shear masonry walls not exceeding total wall height of 12 feet (3658 mm) above top of foundation, mortar test shall be permitted to be limited to those at the beginning of masonry work for each mix design.

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