The early-age shrinkage can easily result in crack of concrete in the early age, which seriously affects the durability of concrete. The CaO-based expansion additive is a normally used and effective material for the shrinkage compensation and the reduction of early-age crack risk in concrete. The hydration is a factor that significantly influences the mechanical and durability properties of concrete, and the study on the hydration of the cement paste containing a CaO-based expansive additive under different curing temperature and with superabsorbent polymers addition is lacking. In this study, tests were conducted using the low-field nuclear magnetic resonance to assess the effect of curing temperature and superabsorbent polymers on the hydration of early-age cement paste containing a CaO-based expansion additive. The experimental results show that the incorporation of CaO-based expansive additive can promote the hydration of cement paste, and 2% dosage of CaO-based expansive additive has a better promotion than that of 3% dosage. High curing temperature can effectively accelerate the hydration of cement paste containing the CaO-based expansion additive. In addition, superabsorbent polymers can also effectively promote hydration.

中文翻译：

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养护温度和高吸水聚合物对含CaO基膨胀剂的早龄水泥浆体水化的影响

早龄期收缩容易造成混凝土早期开裂，严重影响混凝土的耐久性。CaO基膨胀剂是一种常用且有效的材料，用于补偿收缩和降低混凝土早期开裂风险。水化作用是显着影响混凝土力学性能和耐久性能的一个因素，而对不同养护温度下添加高吸水聚合物的CaO基膨胀剂水泥浆水化作用的研究尚缺乏。在这项研究中，使用低场核磁共振进行了测试，以评估固化温度和高吸水性聚合物对含有 CaO 基膨胀添加剂的早期水泥浆水化的影响。实验结果表明，掺入CaO基膨胀剂能促进水泥浆体的水化，2%用量的CaO基膨胀剂比3%用量有更好的促进作用。高养护温度可有效加速含有CaO基膨胀剂的水泥浆体的水化。此外，高吸水性聚合物还可以有效促进水合作用。