Industrial bio-based plant aggregates as hygric and insulating construction materials for energy efficient building

Jiang, Yunhong, Lawrence, Mike, Zhang, Meng and Cui, Jiandong (2020) Industrial bio-based plant aggregates as hygric and insulating construction materials for energy efficient building. Frontiers of Chemical Science and Engineering. ISSN 2095-0187 (In Press)

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In this paper, the bulk density, microstructure, porosity and pore size distribution of the selected aggregates, including hemp shiv, flax shiv, rape shiv and wheat straw, are fully studied due to these properties are highly related to their excellent characteristics and more or less linked to the properties of the final product. The scanning electron microscope results showed all the selected aggregates have a highly porous and complex hierarchical structure, whereas the arrangement of pores and the thickness of cell wall are significantly different among these aggregates. All the selected aggregates had a low bulk density ranging from 30 to 130 kg · m−3 and a high porosity between 75.81% and 88.74%. The thermal conductivity of the selected bio-aggregates ranged from 0.04 to 0.06 W·m−1·K−1. The thermal conductivity of the selected aggregates was not only depending on the bulk density of the sample but also depending on the raw material. Hemp shiv, rape shiv and flax shiv were excellent hygric regulators with moisture buffer value (MBV) ranging from 2.07 to 2.36 g·m−2·%RH−1, whereas, wheat straw had a lower MBV value ranging from 1.76 to 1.97 g·m−2·%RH−1. The results showed that particle size does not affect the MBV value. The MBV value increases linearly with bulk density.

Item Type: Article
Uncontrolled Keywords: bio-based aggregates, density, porosity, thermal conductivity, hygric properties
Subjects: F200 Materials Science
F800 Physical and Terrestrial Geographical and Environmental Sciences
H800 Chemical, Process and Energy Engineering
Department: Faculties > Health and Life Sciences > Applied Sciences
Depositing User: Rachel Branson
Date Deposited: 21 Sep 2020 10:01
Last Modified: 23 Sep 2020 12:30

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