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CONCRETE MASONRY UNIT Section 04300 15-1207 grout has taken its set, but before it has hardened. When the prism test method of CBC Section 2105A.2.2.2 is used during construction, the tests in this paragraph are not required. D. Unit Strength Method: The determination of compressive strength by the unit strength method shall be in accordance with CBC Section 2105A.2.2.1.2 for concrete masonry. E. Masonry Core Testing: 1. Not less than two cores shall be taken from each building for each 5,000 square feet of the greater of the masonry wall area or the floor area or fraction thereof. The architect or structural engineer in responsible charge of the project or his/her representative or the inspector of record shall select the areas for sampling. Cores shall be a minimum of 3% inches in diameter and shall be taken in such a manner as to exclude masonry unit webs and reinforcing steel. If vertical reinforcing steel is placed such that cores will include reinforcing steel, core testing may be waived by the design professional in responsible charge, as approved by the enforcement agency. The inspector of record shall observe the coring of the masonry walls. Perform coring 7 to 14 days after the placement of grout. Perform the shear testing on the cores 28 days after grout placement. 2. Visual examination of all cores shall be made by the testing laboratory and the condition of the cores reported as required by the California Administrative Code. All cores taken shall be tested in shear. The shear test shall test both joints between the grout core and the outside wythes or face shell of the masonry. Shear testing apparatus shall be of a design approved by the enforcement agency. Core samples shall not be soaked before testing. The average unit shear on the cross section of all the cores shall not be less than 2.5 x 4 "m (psi). 3. All cores shall be submitted to the laboratory, acceptable to DSA, for examination, regardless of whether the outside Wythe or face shells separated during the cutting operation. The laboratory shall report the location where each core was taken, the findings of their visual examination of each core, and the results of the shear tests. F. Inspection and testing of post -installed anchors in masonry shall be required in accordance with requirements for concrete in CBC Chapters 17A and 19A. 1.09 MASONRY INSPECTION A. Masonry Inspection: 1. All masonry construction shall be inspected and verified in accordance with TMS 402/ACI 530/ASCE 5 and TMS 602/ACI 530.1ASCE 6 quality assurance program as set forth in Table 1.19.3, Level C requirements. 2. All structural masonry work shall be periodically inspected during laying and continuously during grouting by an inspector specially approved for that purpose by DSA. The inspector shall make test samples and perform such tests as are required and shall check the materials, details of construction, and construction procedures. The special masonry inspector shall furnish a verified report that, of his own personal knowledge, the work covered by the report has been performed, and materials used and installed in every material respect in compliance with the duly approved plans and 5