Unusual water transport properties of some traditional Scottish shale bricks

Isobel M Griffin, Christopher Hall, Andrea Hamilton

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Sorptivity, porosity and pore size distribution have been measured for five types of pressed fired-clay bricks recovered from a Second World War airfield in East Lothian, Scotland. It was found that the bricks, all manufactured locally from colliery shale, had similar porosities but significantly different compositions, leading to differences in pore structure and transport properties. Unusually high concentrations of organic carbon were found by analysis. In imbibition tests using water and n-decane, capillary absorption generally did not scale with time1/2, indicating material non-uniformity in the flow direction. A sharp front n-layer model was used to estimate the variation of sorptivity and permeability in drilled cores taken through bed and stretcher faces. A surface skin of lower sorptivity was found in some materials. This is attributed to compression of the green clay in the brick mould during manufacture. Comparison of water and decane imbibition showed that water sorptivity is reduced throughout by partial wettability. This hydrophobicity of these shale bricks is tentatively related to their high organic carbon content, which is incompletely burned out during firing. We show how the partial wettability may be expressed in terms of a wetting index derived from imbibition data
LanguageEnglish
Pages1761-1771
Number of pages11
JournalMaterials and Structures
Volume47
Issue number10
Early online date11 Aug 2013
DOIs
Publication statusPublished - Oct 2014

Fingerprint

Shale
Brick
Transport properties
Wetting
Water
Organic carbon
Clay
Porosity
Hydrophobicity
Pore structure
Pore size
Skin
Compaction
Chemical analysis
decane
clay

Keywords

  • fired clay brick
  • sorptivity
  • water flor in heterogeneous materials

Cite this

Griffin, Isobel M ; Hall, Christopher ; Hamilton, Andrea. / Unusual water transport properties of some traditional Scottish shale bricks. In: Materials and Structures. 2014 ; Vol. 47, No. 10. pp. 1761-1771.
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Unusual water transport properties of some traditional Scottish shale bricks. / Griffin, Isobel M; Hall, Christopher; Hamilton, Andrea.

In: Materials and Structures, Vol. 47, No. 10, 10.2014, p. 1761-1771.

Research output: Contribution to journalArticle

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