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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Sorption Kinetics of Superabsorbent Polymers in Cement Pastes Quantified by Neutron Radiography
Author(s): Christof Schroefl and Viktor Mechtcherine
Publication: Special Publication
Appears on pages(s): 371-386
Keywords: cement hydration; cement paste; internal curing; neutron radiography imaging; portland cement; silica fume; superabsorbent polymer
Abstract:Water desorption from superabsorbent polymers (SAP) into cement-based pastes was characterized by neutron radiography imaging to promote the understanding of the mechanisms behind internal curing of concrete. Two anionic SAP samples were used which differed in their inherent sorption kinetics in cement pore solution (SAP 1: self-releasing; SAP 2: retentive). Portland cement pastes with W/C of 0.25 and 0.50 and a paste additionally containing silica fume (W/C = 0.42, SF/C = 1/10) were investigated.
Desorption from SAP 1 initiated immediately. SAP 2 released water into all the matrices as well, even in the cement paste with the high W/C of 0.50. In the other two pastes, which require internal curing by principle, SAP 2 retained its stored liquid for as long as the dormant period of cement hydration. Intense desorption then set in and continued throughout the acceleration period and even beyond.
These findings explain the pronouncedly higher efficiency of SAP 2 as an internal curing admixture when compared to SAP 1.
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