Understanding the influence of alkali-resistant superabsorbent polymers (SAPs) on the performance of cementitious materials based on Portland Cement (PC) is crucial for optimizing their applications in construction. This study primarily focuses on the effects of varying SAP content on the multiple properties and hydration process of PC materials. The optimal dosage of alkali-resistant SAP (with an absorption capacity of 21.63 g/g in cement) for Portland cement with an effective water-to-cement ratio (w/c) eff = 0.20 is 0.20 m%. Under the condition of maintaining the same fluidity as the control group, strength decreased by only 2.1 %, autogenous shrinkage was reduced by 36.7 %, hydration of the cement-based material was enhanced, and the porosity of the matrix was reduced. As the SAP dosage increased (from 0.35 m% to 0.80 m%), the degree of cement hydration increased and autogenous shrinkage further decreased, but excessive SAP content led to an increase in residual pores within the matrix, reducing porosity and resulting in lower strength. Although SAP compensates for the negative effects on pore structure in the early stages of hydration, residual effects still contribute to reduced material strength. The study's findings reveal the interaction between SAP content and cementitious material performance, aiming to guide future optimization of SAP incorporation for enhanced material properties and sustainable construction practices.

中文翻译：

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优化耐碱高吸水性聚合物用量以增强基于硅酸盐水泥的高性能胶凝材料的性能


了解耐碱高吸水性聚合物 （SAP） 对基于波特兰水泥 （PC） 的胶凝材料性能的影响对于优化其在建筑中的应用至关重要。本研究主要关注不同 SAP 含量对 PC 材料的多种特性和水化过程的影响。有效水灰比 （w/c） eff = 0.20 的波特兰水泥的耐碱 SAP（在水泥中的吸收能力为 21.63 g/g）的最佳掺量为 0.20 m%。在保持与对照组相同流动性的条件下，强度仅下降了 2.1 %，自体收缩减少了 36.7 %，水泥基材料的水化增强，基体的孔隙率降低。随着 SAP 掺量的增加（从 0.35 m% 增加到 0.80 m%），水泥水化程度增加，自体收缩进一步降低，但过高的 SAP 含量导致基体内残余孔隙增加，降低孔隙率并导致强度降低。尽管 SAP 在水合的早期阶段补偿了对孔隙结构的负面影响，但残留效应仍然会导致材料强度降低。该研究的结果揭示了 SAP 含量与胶凝材料性能之间的相互作用，旨在指导未来优化 SAP 掺入，以增强材料特性和可持续建筑实践。