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Polymers 2017, 9(11), 600; https://doi.org/10.3390/polym9110600

Hygral Behavior of Superabsorbent Polymers with Various Particle Sizes and Cross-Linking Densities

1
Department of Civil Engineering, Kangwon National University, Chuncheon 24341, Korea
2
North Gyeonggi Branch, Korea Conformity Laboratories, Pocheon 11184, Korea
3
Department of Architectural Engineering, Gachon University, Seongnam 13120, Korea
4
Department of Civil and Environmental Engineering, Gachon University, Seongnam 13120, Korea
*
Author to whom correspondence should be addressed.
Received: 5 October 2017 / Revised: 5 November 2017 / Accepted: 7 November 2017 / Published: 10 November 2017
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Abstract

This study focuses on investigating the effects of particle size and cross-linking density on the hygral behavior of superabsorbent polymers (SAPs), which are increasingly used as an internal curing material for high-performance concrete. Four SAPs with different mean particle diameters and cross-linking densities were tested under controlled wetting and drying conditions to measure free absorption and desorption kinetics. Absorption capacities of SAPs under actual mixing conditions were additionally measured and verified by means of mortar flow and semi-adiabatic hydration heat measurements. In addition, the effects of SAP type and dosage (i.e., 0.2, 0.4, and 0.6% by mass of cement) on the mechanical properties of hardened mortar were assessed. The results indicated that: (1) the absorption capacity increased with decreased cross-linking density and increased particle size under both load-free and mixing conditions; and (2) the greater the cross-linking density and the lower the particle size, the shorter the desorption time. It was also confirmed that while the early-age mechanical properties were more related with the gel strength of swollen SAP, the later-age mechanical properties were more affected by the water retention capacity and spatial distribution of SAP in the matrix. View Full-Text
Keywords: superabsorbent polymers; particle size; cross-linking density; absorption; desorption; internal curing; mortar; mechanical properties superabsorbent polymers; particle size; cross-linking density; absorption; desorption; internal curing; mortar; mechanical properties
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Yun, K.-K.; Kim, K.-K.; Choi, W.; Yeon, J.H. Hygral Behavior of Superabsorbent Polymers with Various Particle Sizes and Cross-Linking Densities. Polymers 2017, 9, 600.

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