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Continuum modeling of the swelling behavior of concrete when modified through superabsorbent polymers

The main purpose of our investigation is to model the physical solidification process of a concrete mixture, involving water absorbing constituents, i. e. Superabsorbent Polymers (SAP). In order to model the chemo‐mechanical swelling process, the system is described within the framework of the Theory of Porous Media (TPM). The swelling process is accounted for by including mass exchange terms between free and absorbed water. The chemo‐mechanical driving forces are deduced from non‐equilibrium thermodynamics while constitutive relations are motivated by appropriate micro‐models of the swelling process. (© 2016 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)