Impact of additional water on cementitious materials containing sap: effects on compressive strength and autogenous shrinkage

There are divergent views in the literature regarding the use of additional water in cementitious materials containing superabsorbent polymers (SAP). The polymer is mainly used to mitigate autogenous shrinkage. Some studies report a decrease in compressive strength and attribute it to the addition of SAP, while others argue that the real issue is the use additional water. The aim of this study is to analyze the state of art regarding the influence of additional water in cementitious mixtures containing SAP and its influence on compressive strength and autogenous shrinkage. Microconcretes and pastes are categorized based on SAP dosages and systematically reviews relevant literature. The methodology employs a parameterization approach for standardized comparisons, considering water-to-cement ratios (w/c) and total water content. Autogenous shrinkage and compressive strength are analysed for each mixture, with and without extra water. Results reveal distinct behaviors, indicating optimal SAP dosages of 0.20% by weight of binder for balancing autogenous shrinkage mitigation and minimal harm to compressive strength. In conclusion, this research contributes valuable insights into SAP's effectiveness in mitigating autogenous shrinkage and provides a foundation for optimizing SAP dosages in different cementitious materials. The findings facilitate informed decisions for durable concrete construction practices.