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2122.8 Mortar and Grout
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Vertical alignment of cells to be grouted shall maintain clear, unobstructed, continuous, vertical cores measuring not less than 21/2 inches by 3 inches (51 mm by 76 mm) for fine aggregate grout and 3 inches by 3 inches (76 mm by 76 mm) for coarse aggregate grout as defined by ASTM C476. The architect or engineer may specify other grout space sizes which shall be permitted provided they comply with TMS 402 Section 184.108.40.206 and TMS 602 Section 3.5C.
Grout shall be placed before any initial set has occurred, but in no case more than 11/2 hours after the mix-designed water has been added.
Grouting shall be consolidated between lifts by puddling, rodding or mechanical vibration.