Electrical moisture content measurements of modified wood. Emmerich, L. & Brischke, C. Holztechnologie, 62(2):11–22, 2021. abstract bibtex Material specific moisture content-electrical resistance (MC-R) functions were calculated for thermally and chemically modified (DMDHEU, acetylation, furfurylation) timber. In comparison with an untreated reference, the electrical conductivity of wood increased by both thermal and chemical modifications. Hence, material-specific MC-R functions are needed for modified wood to receive the highest possible accuracy when monitoring moisture developments based on electrical R measurements. When using MC-R functions of untreated wood for MC estimates in modified materials of the same wood species, this resulted in overestimates of the modified woods´ actual MCmaterial by up to 12.0 %. The overestimate of the actual MC increased further (up to 14.0 %), when MCwood was considered for the modified materials. Consequently, applying MC-R functions of untreated wood for MC estimates in modified materials overestimates the actual MC and by that underestimates the predicted service life of wooden constructions significantly. The presented, material-specific MC-R functions may require a correction, when process conditions (temperature, pressure atmosphere) or chemical amounts vary as crucial factors for the electrical properties in wood.
@article{emmerich_electrical_2021,
title = {Electrical moisture content measurements of modified wood},
volume = {62},
abstract = {Material specific moisture content-electrical resistance (MC-R) functions were calculated for thermally and chemically modified (DMDHEU, acetylation, furfurylation) timber. In comparison with an untreated reference, the electrical conductivity of wood increased by both thermal and chemical modifications. Hence, material-specific MC-R functions are needed for modified wood to receive the highest possible accuracy when monitoring moisture developments based on electrical R measurements. When using MC-R functions of untreated wood for MC estimates in modified materials of the same wood species, this resulted in overestimates of the modified woods´ actual MCmaterial by up to 12.0 \%. The overestimate of the actual MC increased further (up to 14.0 \%), when MCwood was considered for the modified materials. Consequently, applying MC-R functions of untreated wood for MC estimates in modified materials overestimates the actual MC and by that underestimates the predicted service life of wooden constructions significantly. The presented, material-specific MC-R functions may require a correction, when process conditions (temperature, pressure atmosphere) or chemical amounts vary as crucial factors for the electrical properties in wood.},
language = {en},
number = {2},
journal = {Holztechnologie},
author = {Emmerich, Lukas and Brischke, Christian},
year = {2021},
pages = {11--22},
}
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