Microstructural and bulk property changes in hardened cement paste during the first drying process

Ippei Maruyama, Yukiko Nishioka, Go Igarashi, Kunio Matsui

Research output: Contribution to journalArticle

80 Citations (Scopus)

Abstract

This paper reports the microstructural changes and resultant bulk physical property changes in hardened cement paste (hcp) during the first desorption process. The microstructural changes and solid-phase changes were evaluated by water vapor sorption, nitrogen sorption, ultrasonic velocity, and 29Si and 27Al nuclear magnetic resonance. Strength, Young's modulus, and drying shrinkage were also examined. The first drying process increased the volume of macropores and decreased the volume of mesopores and interlayer spaces. Furthermore, in the first drying process globule clusters were interconnected. During the first desorption, the strength increased for samples cured at 100% to 90% RH, decreased for 90% to 40% RH, and increased again for 40% to 11% RH. This behavior is explained by both microstructural changes in hcp and C-S-H globule densification. The drying shrinkage strains during rapid drying and slow drying were compared and the effects of the microstructural changes and evaporation were separated.

Original languageEnglish
Pages (from-to)20-34
Number of pages15
JournalCement and Concrete Research
Volume58
DOIs
Publication statusPublished - 2014 Apr 1

Keywords

  • Bending Strength (C)
  • Calcium-Silicate-Hydrate (C-S-H)(B)
  • Drying (A)
  • Microstructure (B)
  • Surface Area (B)

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)

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