Porosity estimation of Phyllostachys edulis (Moso bamboo) by computed tomography and backscattered electron imaging
2017
This study aims to investigate and quantify the porosity in the cross
section of Phyllostachys edulis (Moso bamboo) culm wall. The porosity results are
expected to be utilised in numerical study of heat and moisture transfer. Computed
tomography (CT) and backscattered electron (BSE) imaging methods are utilised in
this study because these two methods allow measurements of the anisotropic features
of bamboo specimens. The results of these two methods can be represented as
the function of the real dimension rather than the pore size distribution of the
specimen. The specimens are obtained from eight different locations along the
Moso bamboo culms. Both internodes and nodes specimens are measured in this
study. The average porosity, standard deviation (SD) and coefficient of variation
(COV) are calculated for BSE and CT results. Pearson product-moment correlation
coefficient (PPMCC) is also calculated in this study to analyse the correlation
between the BSE results and CT results. Typical porosity results from 400 sampling
points and 10 portions average porosity are analysed in this study. The CT scanning
results show similar trend with BSE results. The correlation relationship between
BSE and CT results approaches moderate correlation level to strong correlation
level. The average porosity of internode specimens is from 43.9 to 58.8 % by BSE
measurement and from 44.9 to 63.4 % by CT measurement. The average porosity of
node specimens is from 37.4 to 56.6 % by BSE measurement and from 32.1 to
62.2 % by CT measurement.
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