Behaviors of reinforced concrete slabs demolded at the early age in October and subjected to sustained bending moments are investigated through eight specimens. The test parameters are (1) the age at demolding (three or twenty-eight days), (2) the magnitude of the bending moments (zero, 0.3Mc, or 0.6Mc, where Mc is the computed cracking moment), and (3) the directions of loading (in tension or compression on the top fiber). The test results show the effects of the age at demolding are ±20〜30% on the time-dependent curvature increase.
