8.4 Flexural Strength Test Specimens—Cure the flexural
strength test specimens in accordance with 8.1 and 8.2 except
that while in storage for a minimum period of 20 h immediately
prior to testing they shall be immersed in water saturated with
calcium hydroxide at 73 6 3°F [23 6 2°C]. At the end of the
curing period, between the time the specimen is removed from
curing until testing is completed, drying of the surfaces shall be
prevented.