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以高吸水树脂(SAP)为内养护水分蓄存载体,采用核磁共振法研究了内养护水分在水泥浆体中的释放规律,探索了其对水泥浆体毛细负压的影响以及参与水化的特征。结果表明,高吸水树脂基内养护水泥浆体的0.1~6ms弛豫峰和32.7~200.9ms、231.0~1629.7ms弛豫峰分别由毛细水、内养护水产生;内养护水分的释放始于水泥浆体水化加速期,内养护时间随蓄水SAP掺量的增加而延长;释放出的内养护水分降低了水泥浆体的毛细负压,同时也促进了水泥浆体的水化;SAP仅控制的是内养护水分的释放速率,内养护水泥浆体与直接增加相同额外水量的浆体后期水化程度相当。
In order to maintain the moisture storage carrier with superabsorbent polymer (SAP), the releasing law of internal curing moisture in cement paste was studied by using nuclear magnetic resonance (NMR) method, and the influence of moisture on the capillary negative pressure of cement paste was explored. feature. The results showed that the relaxation peak of 0.1 ~ 6ms and relaxation peak of 32.7 ~ 200.9ms and 231.0 ~ 1629.7ms were respectively produced by capillary water and internal conservation water. The release of internal curing water began with cement During the hydration period of slurry, the curing time is prolonged with the increase of SAP content. The released inner curing water reduces the capillary negative pressure of cement paste and also promotes the hydration of cement paste. SAP only The control is within the maintenance of the release rate of water, within the conservation of cement slurry and directly increase the amount of slurry the same amount of late hydration degree.