Superabsorbent Polymer (SAP) has emerged as a topic of considerable interest in recent years. The present study systematically and quantitively investigated the effect of SAP on hydration, autogenous shrinkage, mechanical properties, and microstructure of cement mortars. Influences of SAP on hydration heat and autogenous shrinkage were studied by utilizing TAM AIR technology and a non-contact autogenous shrinkage test method. Scanning Electron Microscope (SEM) was employed to assess the microstructure evolution. Although SAP decreased the peak rate of hydration heat and retarded the hydration, it significantly increased the cumulative heat, indicating SAP helps promote the hydration. Hydration promotion caused by SAP mainly occurred in the deceleration period and attenuation period. SAP can significantly mitigate the autogenous shrinkage when the content ranged from 0 to 0.5%. Microstructure characteristics showed that pores and gaps were introduced when SAP was added. The microstructure difference caused by SAP contributed to the inferior mechanical behaviors of cement mortars treated by SAP.

近年来，超吸收性聚合物（SAP）成为人们关注的话题。本研究系统和定量地研究了SAP对水泥砂浆的水合作用，自收缩，机械性能和微观结构的影响。利用TAM AIR技术和非接触式自发收缩试验方法研究了SAP对水化热和自发收缩的影响。扫描电子显微镜（SEM）用于评估微观结构的演变。尽管SAP降低了水合热的峰值速率并延迟了水合，但它显着增加了累积热量，表明SAP有助于促进水合。SAP引起的水合作用主要发生在减速期和衰减期。当含量范围为0到0.5％时，SAP可以显着减轻自发收缩。微观结构特征表明，当添加SAP时会引入孔和缝隙。SAP引起的微观结构差异导致SAP处理的水泥砂浆的机械性能较差。