Title:
Design and Performance of Novel SAP for Making Concrete Sustainable
Author(s):
Hajime Kawai
Publication:
Web Session
Volume:
ws_S25_JimKawai.pdf
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
3/30/2025
Abstract:
Superabsorbent polymers (SAPs) are known to improve the concrete strength, reduce shrinkage, and enhance the freeze-thaw resistance of concrete due to their internal curing effects and void formation capabilities. However, they quickly absorb water from the concrete matrix, significantly affect the rheology of fresh concrete such as reduced flowability. To solve this, additional water can be added to compensate for the water absorbed by SAPs, but this increases the water content in the concrete mix and prevent the desired property improvements. Based on our polymer design technologies, we have developed a novel SAP that allows us to control the water absorption behavior of SAPs and has been confirmed to achieve both improved handling and concrete properties that conventional SAPs cannot. This technology not only reduces the impact on fresh properties but also enables to design the SAP suitable for various applications and conditions. As examples of the application of this technology, we will introduce novel SAPs suitable for internal curing agents, freeze-thaw resistant concrete, and 3D concrete printing (3DCP) applications. As for internal curing agents, we’ve confirmed that new SAP can compensate for the decline in physical properties of concrete by the use of alternative cementitious materials. We expect that these new SAPs will contribute to a sustainable society as new concrete additive materials that can improve the durability of concrete structures and reduce environmental impact.