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The representative plots of mass changes (%) against time during the water immersion and the second drying procedures. w/o N2: stroboscopic post-curing in the air atmosphere. Post-curing w/ N2: stroboscopic post-curing at a nitrogen gas atmosphere. It was noted that saturation was achieved 14 days after water immersion and drying was completed 20 days after drying began in all groups. #: data of unpolished subgroups were quoted from the previous study [19].
