Water vapor adsorption isotherm model of portland cement paste

Ippei Maruyama, Go Igarashi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Adsoiption and desorption isotheim model of hardened cement paste under 20 °C is proposed. Adsorption and desorption isotheim of hardened cement paste with different water cement ratio, temperature history and different degree of hydmtion weic experimentally studied. Based on the experimental data, following characteristics weic derived: 1) BET suiface are of adsorption pmcess and desorption process has linear iclationship, 2) Relationship betxeen statistical thickness of adsorption and relative humidity is identical in the range below 40°oRl-J, 3) t-curve can be derived from the relationship between statistical thickness of adsorption and iclative humidity, 4) difference between statistical thickness of adsorption and t-curve has a iclationship between Kelvin radius, 5) virgin desoiption curve value less than 40° oRH has similar value of those of desoiption curve afier drying we-treatment 6) virgin desoiption curve has a linear iclationship with iclative humidity Based on these experimental points, empirical adsorption model is proposed.

Original languageEnglish
Pages (from-to)1033-1041
Number of pages9
JournalJournal of Structural and Construction Engineering
Volume76
Issue number664
DOIs
Publication statusPublished - 2011 Jun 1

Keywords

  • Adsorption isotherm
  • Hardened cement paste
  • Relative humidity
  • Statistical thickness of ads orption
  • T-curve

ASJC Scopus subject areas

  • Architecture
  • Building and Construction

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