Establishment of a preconditioning regime for air permeability and sorptivity of alkali-activated slag concrete

Kai Yang, Changhui Yang, Bryan Magee, Sreejith Nanukuttan, Jianxiong Ye

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

This study reports an experimental investigation designed to assess the influence of near-surfacemoisture contents on permeation properties of alkali-activated slag concrete (AASC). Five differentdrying periods (5, 10, 15, 20 and 25 days) and three AASC and normal concretes with compressivestrength grades ranging from C30 to C60 were considered. Assessment of moisture distribution was achieved using 100 mm diameter cores with drilled cavities. Results indicate that air permeability of AASC is very sensitive to the moisture content and its spatial distribution, especially at relative humidity above 65%. To control the influence of moisture on permeation testing, the recommendation of this paper is that AASC specimens should be dried in controlled conditions at 40 C for 10 days prior to testing. It was also concluded from this study that AASC tends to perform less well, in terms of air permeability and sorptivity, than normal concrete for a given strength grade. This conclusion reinforces the need to further examine AASC properties prior to its widespread practical use.
Original languageEnglish
Pages (from-to)19-28
JournalCement and Concrete Composites
Volume73
Early online date1 Jul 2016
DOIs
Publication statusPublished - Oct 2016

Keywords

  • Alkali-activated slag concrete
  • Relative humidity
  • Sorptivity
  • Porosity
  • Air permeability

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