Jiang, Y, Ansell, MP, Jia, X orcid.org/0000-0001-8590-7477 et al. (2 more authors) (2017) Physical characterisation of hemp shiv: Cell wall structure and porosity. In: ICBBM & ECOGRAFI 2017. 2nd International Conference on Bio-Based Building Materials & 1st Conference on ECOlogical valorisation of GRAnular and FIbrous materials, 21-23 Jun 2017, Clermont-Ferrand, France.
Abstract
Hemp shiv has been widely used as a plant aggregate incorporated into natural building composites such as hemp-lime due to its low thermal conductivity and high moisture buffer value. The aim of this research is to study the intrinsic physical parameters such as the porosity and cell wall structure of hemp shiv, which are responsible for the favourable thermal and hygric properties of hemp shiv. Scanning electron microscope observations of hemp shiv revealed microstructural features. A computed tomography (CT) scan improved the vizualization of pore shape and pore connectivity in three dimensions. The vessels exhibit little variation in size and there is no clear pore arrangement with a diffuse-porous distribution. The vessels are mostly solitary although some small groups of adjacent vessels exhibit shared cell walls between them. The vessels are approximately 50 to 100 μm in diameter and are surrounded by relatively thick fibre cells. These thick-walled fibres are located between the vessels with a diameter ranging from 1μm to 2μm. The pore frequency of hemp shiv (generally only measured on diffuse-porous woods) is around 20.8 vessels/mm2. The porosity of hemp shiv has been studied by a combination of mercury intrusion porosimetry (MIP) and CT scanning. Average accessible porosity of hemp shiv is 76.67 ± 2.03 % measured by MIP measurement and from 50% to 75% measured by CT, depending on the threshold and resolution.
Metadata
Item Type: | Proceedings Paper |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | This is an author produced version of a paper presented at ICBBM & ECOGRAFI 2017. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Hemp shiv, Microstructure, SEM, Porosity, Pore distribution, CT scanner and MIP |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 25 May 2017 12:14 |
Last Modified: | 22 May 2018 08:58 |
Published Version: | https://www.conftool.net/icbbmecografi2017/ |
Status: | Published |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:116882 |