Superabsorbent polymer (SAP), which can act as water reservoir, was an internal curing (IC) agent with great potential to reduce the shrinkage and cracking of cement-based materials. However, the volume shrinkage of SAP after water release will lead to the formation of additional voids, which will lead to a clear reduction of mechanical properties. In present work, a novel SAP composite with a rigid skeleton (IP-PS) was synthesized by embedding in-situ polymerized SAP hydrogel into the pores of porous ceramic (PS). The results demonstrated that the compressive strength of IP-PS0.054 was above 10 % higher than that of SAP0.054 in the early and late stages, the compressive strength of IP-PS0.054 at 28 days reached 97.71 % of that of the control group, which was predominantly ascribed to the support provided by the embedded skeleton. The development of self-desiccation was also notably delayed by the incorporation of IP-PS, as evidenced by the approximately 12 % reduction compared to SAP0.054 and 47 % reduction compared to Control group in 7-day autogenous shrinkage, which was on account of the enhanced water storage and durable IC capacity of IP-PS. Furthermore, the impermeability of cement-based materials was also improved by the in-situ polymerized hydrogel modification.

中文翻译：

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内嵌多孔陶粒砂高吸水性聚合物复合材料增强水泥砂浆性能


高吸水性聚合物（SAP）可以作为储水层，是一种内固化（IC）剂，在减少水泥基材料的收缩和开裂方面具有巨大潜力。然而，SAP在放水后的体积收缩会导致额外空隙的形成，从而导致力学性能明显下降。在目前的工作中，通过将原位聚合的 SAP 水凝胶嵌入多孔陶瓷 (PS) 的孔中，合成了一种新型具有刚性骨架的 SAP 复合材料 (IP-PS)。结果表明，IP-PS0.054的前期和后期抗压强度比SAP0.054提高了10%以上，28天时IP-PS0.054的抗压强度达到了SAP0.054的97.71%。对照组，这主要归因于嵌入式骨架提供的支持。 IP-PS 的加入也显着延迟了自干燥的发展，7 天自收缩率与 SAP0.054 相比减少了约 12%，与对照组相比减少了 47%，这证明了这一点。 IP-PS 增强的储水能力和耐用的 IC 容量。此外，通过原位聚合水凝胶改性也提高了水泥基材料的抗渗性。