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Evaluation of Absorption Capacity and Spacing of Superabsorbent Polymer Particles in Cement Paste

  • Soushi Yamashita
  • Shin-ichi IgarashiEmail author
Conference paper
Part of the RILEM Bookseries book series (RILEM, volume 24)

Abstract

The absorption capacity of superabsorbent polymers (SAP) in a real cement environment is a need-to-know property as a new admixture for concrete. In this study, fundamental stereology techniques were applied to cross sections of cement pastes in which solution-polymerized SAP particles were embedded. Its absorption capacity was estimated from the area fraction and particle size distribution of the SAP in the 2D planes. Further, the representative spacing between the SAP particles was also evaluated using point process statistics. The absorption capacity estimated was greater than that obtained by the tea-bag method using a cement filtrate. The SAP seems to absorb mixing water quickly in the initial short time during mixing. The number density of the SAP particles in the cross sections was also greater than the estimation calculated from the absorption capacity and the particle size distribution of initial dry SAP. This fact suggests that the SAP particles broke away during mixing. The centroids of SAP particles were distributed as to form a regular pattern. A procedure to evaluate the median distance from a given location to the surface of the nearest SAP particle was proposed by combining the mean diameter of swollen SAP profiles and the point process G- and F-functions. The distances between SAP particles were found at most a few mm for the mass fraction of 0.58% against cement.

Keywords

Absorption Particle size distribution Image analysis Point process statistics 

References

  1. Jensen, O.M., Hansen, P.F.: Water-entrained cement-based materials: I. Principles and theoretical background. Cem. Concr. Res. 31(4), 647–654 (2001)CrossRefGoogle Scholar
  2. Mechtcherine, V., Reinhardt, H.W.: Application of Superabsorbent Polymers (SAP) in Concrete Construction, State-of-the-Art Report Prepared by Technical Committee 225-SAP. Springer, Dordrecht (2012)CrossRefGoogle Scholar
  3. Mechtcherine, V., et al.: Effect of superabsorbent polymers (SAP) on the freeze - thaw resistance of concrete: results of a RILEM interlaboratory study. Mater. Struct. 50, 14 (2017)CrossRefGoogle Scholar
  4. Schröfl, C., Snoeck, D., Mechtcherine, V.: A review of characterization methods for superabsorbent polymer (SAP) samples to be used in cement-based construction materials: report of the RILEM TC 260-RSC. Mater. Struct. 50, 197 (2017)CrossRefGoogle Scholar
  5. Snoeck, D., Schröfl, C., Mechtcherine, V.: Recommendation of RILEM TC 260-RSC: testing sorption by superabsorbent polymers (SAP) prior to implementation in cement-based materials. Mater. Struct. 51, 116 (2018)CrossRefGoogle Scholar
  6. Wyrzykowski, M., Lura, P., Pesavento, F., Garwin, D.: Modeling of water migration during internal curing with superabsorbent polymers. J. Mater. Civ. Eng. 24, 1006 (2012)CrossRefGoogle Scholar
  7. Wyrzykowski, M., Igarashi, S., Lura, P., Mechtcherine, V.: Recommendation of RILEM TC 260-RSC: using superabsorbent polymers (SAP) to mitigate autogenous shrinkage. Mater. Struct. 51, 135 (2018)CrossRefGoogle Scholar

Copyright information

© RILEM 2020

Authors and Affiliations

  1. 1.Department of Civil and Environmental EngineeringKanazawa UniversityKanazawaJapan

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