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Title: Impact of a Novel Slow Absorption Superabsorbent Polymer on Compressive Strength and Autogenous Shrinkage of Concrete

Author(s): Yuya Akao

Publication: Symposium Paper

Volume: 354


Appears on pages(s): 177-186

Keywords: super absorbent polymer, flowability, viscosity, compressive strength, freeze-thaw resistance, autogeneous shrinkage, durability

DOI: 10.14359/51736071

Date: 7/1/2022

The application of a novel superabsorbent polymer (SAP) as a multifunctional chemical admixture for concrete properties is expected to contribute to the overall durability and sustainability of concrete structures. SAPs are well known to quickly absorb and retain a significant amount of water within the concrete matrix as a means of providing internal curing. However, the rate of water uptake can significantly affect the rheology of fresh concrete such as reduced flowability. This paper introduces a novel SAP that features slow water absorption and swelling behavior, and its resulting impact on both fresh and hardened concrete properties. The novel SAP has been shown to delay swelling for several hours in cement filtrate, followed by a predictable absorption of water over a 24-hour period comparable to conventional SAP. The delayed swelling effect observed with the novel SAP eliminates the need for additional water to obtain a similar flowability, but with a very slight increase in viscosity, compared to a concrete mixture without SAP. Moreover, the internal curing capability of the novel SAP can result in an increase in both early age and long-term compressive strengths, improved freeze-thaw resistance, and a reduction in autogenous shrinkage under sealed and air curing conditions.