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Test specimens should be vacuum saturated with 0.3M NaOH for approximately 18 hours, following the procedure described in ASTM 1202-97: 9. A companion sample is saturated in the same container to be used for pore solution extraction (see Pore Solution Extraction Test Procedure). The saturation procedure is summarized as follows: immerse the specimens in the 0.3M NaOH solution contained in the vacuum container. Turn on the vacuum pump. When the pressure gauge shows maximum vacuum pressure (less than 1 mm Hg -133 Pa), keep the pump running for about 2 hours. With all valves closed, turn off the pump and maintain vacuum conditions for 18 hours. Open the air valve to release the pressure.
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