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A505.2.3 Partially Grouted Masonry
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A minimum of five units shall be removed from the walls and tested in conformance with ASTM C 90. Compressive strength of the masonry is permitted to be determined in accordance with Tables 218.104.22.168.1 and 222.214.171.124.2 of the Building Code of New York State , assuming Type S mortar. The strain associated with peak stress may be taken as 0.0025.