Effectiveness of preconditioning regimes for assessing water permeability of high performance concrete

Yaocheng Wang, Kai Yang, Adrian Long, Yun Bai, Sreejith Nanukuttan, Bryan Magee, Muhammed Basheer

Research output: Contribution to journalArticle

1 Citation (Scopus)
1 Downloads (Pure)

Abstract

Saturating high performance concrete (HPC) on site for assessing water permeability is a challenge. This paper reports a testing programme established to assess the reliability and efficiency of two field saturation approaches, viz. vacuum saturation and ponding. The water permeability test results after applying the vacuum saturation and ponding were compared with that after incremental immersion. It is found that ponding was unable to remove the influence of moisture, while vacuum saturation can achieve this for wet concretes. Although the influence of moisture can be removed for different HPCs with high initial moisture contents by using the vacuum saturation method, it is not effective when the initial moisture content is low. The results obtained from numerical simulation model and the electrical resistance measurements after incremental immersion suggested that the water permeability of HPCs can be accurately determined if the surface region (140 mm width and 25 mm depth) is fully saturated.
Original languageEnglish
Pages (from-to)126-135
Number of pages10
JournalCement and Concrete Composites
Volume94
Early online date29 Aug 2018
DOIs
Publication statusE-pub ahead of print - 29 Aug 2018

Keywords

  • Pore tourtuosity
  • Alkali-activated slag cement
  • pore solution
  • electrical resistivity
  • capillary porosity
  • X-ray uCT

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