Abstract

The thermal and mechanical properties of bio-aggregate concretes are known to be anisotropic. This is assumed to be the result of an orientated internal arrangement of particles; the internal structure of other aggregate composite materials is known to be a determiner of physical properties and has been the focus of much study. Despite this the internal structure of bio-aggregate concretes has to date only been considered qualitatively. This work presents a novel method for the assessment of the internal structure of bio-aggregate concretes through the application of image analysis. Results are presented for the assessment of hemp-lime specimens and demonstrate a significant anisotropy within the material. These results account for anisotropic thermal and mechanical behaviour observed elsewhere and demonstrate the importance of the internal structure in determining the properties of these materials. This innovative technique represents a significant breakthrough in the search for optimisation of the performance of renewable, low carbon insulation materials. This class of materials is critical to the sustainable future of the construction industry.
Original languageEnglish
Pages (from-to)45-51
Number of pages7
JournalConstruction and Building Materials
Volume116
Early online date3 May 2016
DOIs
Publication statusPublished - 30 Jul 2016

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Concrete aggregates
Strategic materials
Hemp
Construction industry
Cannabis
Lime
Image analysis
Insulation
Anisotropy
Carbon
Thermodynamic properties
Physical properties
Mechanical properties
Composite materials

Keywords

  • Bio-aggregate
  • Hemp-lime
  • Image analysis
  • Internal structure

Cite this

A method for the assessment of the internal structure of bio-aggregate concretes. / Williams, Joseph; Lawrence, Mike; Walker, Peter.

In: Construction and Building Materials, Vol. 116, 30.07.2016, p. 45-51.

Research output: Contribution to journalArticle

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AU - Walker, Peter

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AB - The thermal and mechanical properties of bio-aggregate concretes are known to be anisotropic. This is assumed to be the result of an orientated internal arrangement of particles; the internal structure of other aggregate composite materials is known to be a determiner of physical properties and has been the focus of much study. Despite this the internal structure of bio-aggregate concretes has to date only been considered qualitatively. This work presents a novel method for the assessment of the internal structure of bio-aggregate concretes through the application of image analysis. Results are presented for the assessment of hemp-lime specimens and demonstrate a significant anisotropy within the material. These results account for anisotropic thermal and mechanical behaviour observed elsewhere and demonstrate the importance of the internal structure in determining the properties of these materials. This innovative technique represents a significant breakthrough in the search for optimisation of the performance of renewable, low carbon insulation materials. This class of materials is critical to the sustainable future of the construction industry.

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