Sorption kinetics of superabsorbent polymers (SAPs) in fresh Portland cement-based pastes visualized and quantified by neutron radiography and correlated to the progress of cement hydration

By C. Schroefl, V. Mechtcherine, P. Vontobel, J. Hovind, E. Lehmann. 2015

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Effect of alkalinity and calcium concentration of pore solution on the swelling and ionic exchange of superabsorbent polymers in cement paste (2018, background): “The ionic groups of the SAP affect when the absorbed water is released for internal curing application [23, 27], how ingress of external fluids influence its re-swelling in crack sealing [13] and how repeated swelling/shrinkage influences long-term performance.”
Effect of superabsorbent polymers (SAP) on the freeze–thaw resistance of concrete: results of a RILEM interlaboratory study (2016, background): “Qualitatively, both SAP samples can be classified as ‘‘retentive’’ polymers with respect to the cement pore solution, which indicates that they are able to retain the absorbed pore solution until it is sucked by the hydrating cement paste [5, 16].”