Authors:

Lina Paola Rodriguez

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About Paper:

Concrete that is internally cured by water-swollen superabsorbent polymer (SAP) particles have demonstrated potential in enhancing both mechanical strength and long-term durability. As concrete is the most widely used building material worldwide and contributes approximately 6- 8% of annual CO2 emissions, improving its durability is essential for reducing its environmental footprint. This research focuses on the characterization of SAP particles and their interactions within cementitious systems. The initial phase involves swelling tests in various fluids to evaluate absorption behavior under different chemical environments. Optical microscopy is used to examine the morphology of dry SAP particles and to assess variability in particle size and structure, which can influence performance. Additionally, mechanical testing of SAP-cured mortar is conducted to assess the structural impact of SAP inclusion. Preliminary swelling tests indicate that the gravimetric swelling capacity of SAPs varies over time and is influenced by the surrounding fluid environment. Optical microscopy reveals that the SAP particles exhibit different size distribution with variability in average particle diameter. Mechanical measurements reveal that the inclusion of SAPs leads to comparable or improved strength and demonstrates promising potential in mitigating shrinkage. These findings underscore the importance of chemical environment in SAP performance and highlight the potential of SAPs to enhance the sustainability and durability of cementitious materials through targeted internal curing strategies. Keywords: Superabsorbent Polymers (SAP); Hydrogels; Concrete; Swelling; Internal Curing

Source:

Purdue University / 2025

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Co-authors:

Lina Paola Rodriguez