Internal curing and self-compensation are two different approaches to mitigate autogenous shrinkage, with their own pros and cons. In this study, strategies of internal curing and self-compensation are combined in a single material by pre-absorbing hydrophilic carbon nanotube sponge with L-Serine based carbamate (H-CNTSP@C-Ser). In contrast to the detrimental effects of C-Ser when directly mixed with cement, the autogenous shrinkage and compressive strength of cement can be reduced and enhanced by 81.8 % and 44.4 %, respectively, with the addition of 0.05 wt% H-CNTSP@C-Ser, as compared to the control sample. This comparison strongly confirms the importance of the controlled release of C-Ser. After setting, the hydrolysis of the released C-Ser solution pre-absorbed within H-CNTSP promotes the precipitation of CaCO3, which can not only induce expansion for self-compensation of shrinkage, but also promote the formation of C-S-H with a higher modulus, thereby leading to an enhanced compressive strength of cement paste.

中文翻译：

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通过结合内部固化和自补偿来缓解自体收缩的新策略：氨基甲酸酯溶液吸收的碳纳米管海绵


内部固化和自补偿是减轻自体收缩的两种不同方法，各有利弊。在本研究中，通过将亲水性碳纳米管海绵与 L-丝氨酸基氨基甲酸酯 （H-CNTSP@C-Ser） 预吸收，将内部固化和自补偿策略结合在单一材料中。与 C-Ser 直接与水泥混合时的有害影响相反，与对照样品相比，添加 0.05 wt% H-CNTSP@C-Ser 后，水泥的自体收缩和抗压强度可以分别降低和提高 81.8 % 和 44.4 %。这种比较强烈证实了 C-Ser 控释的重要性。凝固后，在 H-CNTSP 内预吸收的释放的 C-Ser 溶液水解促进 CaCO3 的沉淀，不仅可以诱导膨胀以实现收缩的自我补偿，还可以促进形成具有更高模量的 C-S-H，从而提高水泥浆的抗压强度。