Industrial bio-based plant aggregates as hygric and insulating construction materials for energy efficient building
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RESEARCH ARTICLE
Industrial bio-based plant aggregates as hygric and insulating construction materials for energy efficient building Yunhong Jiang (✉)1,2, Mike Lawrence1, Meng Zhang2, Jiandong Cui3 1 BRE Centre for Innovative Construction Materials, Department of Architecture and Civil Engineering, University of Bath, Bath, BA2 7AY, UK 2 Hub for Biotechnology in the Built Environment, Department of Applied Sciences, Faculty of Health and Life Sciences, Northumbria University, Newcastle-upon-Tyne, NE1 8ST, UK 3 Key Laboratory of Industrial Fermentation Microbiology, Tianjin University of Science and Technology, Tianjin Economic and Technological Development Area (TEDA), Tianjin 300457, China
© The Author(s) 2020. This article is published with open access at link.springer.com and journal.hep.com.cn 2020
Abstract 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. Keywords bio-based aggregates, density, porosity, thermal conductivity, hygric properties
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Introduction
Recently, a new class of the low environmental influences Received March 3, 2020; accepted May 13, 2020 E-mails: [email protected], [email protected]
insulation materials ‘bio-based plant materials’ have drawn significant attention in the field of insulation building materials for fighting against global warming. The advantages of bio-based plant materials include a renewable supply chain and significantly reduced carbon footprint through the photosynthetic carbon stored within plant-based materials. The bio-based insulation materials, such as natural fibre batts, offer many benefits in comparison with more established mineral and oil-based alternatives, such as mineral wool and polyurethane rigid form [1–5]. Another major advantage of bio-based insulation materials is their ability to form a breathable wall by readily abso
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