Mechanical and hygrothermal properties of hemp-silica bio-composites

Article


Ayati, B., Gutierrez Rivas, A. and Chandler, A. 2024. Mechanical and hygrothermal properties of hemp-silica bio-composites. Construction and Building Materials. 425 (Art. 136077). https://doi.org/10.1016/j.conbuildmat.2024.136077
AuthorsAyati, B., Gutierrez Rivas, A. and Chandler, A.
Abstract

This research investigated the development of a fast-drying silica-based binder for hemp concrete products with enhanced mechanical and thermal properties. Hemp-silica bio-composites were prepared by mixing hemp shivs with a two-component binder system composed of liquid sodium silicate and tributyl citrate (TBC). Compressive strength, thermal conductivity, moisture buffering value, cyclic moisture resistance and microstructure of hemp-silica composites were analysed, and the results were compared with those of hemp-lime concrete. Hemp-silica blocks with shiv-liquid sodium silicate mass ratio of 1:3.75 and TBC content of 37.5 wt% of sodium silicate dry matter produced a compressive strength of 0.56 MPa only after 3 days of drying and 1.92 MPa after 28 days. These were higher than hemp-lime blocks at the same density range. Hemp-silica panels showed a thermal conductivity of 0.101 W/mK and an excellent moisture buffering value of 3.49. Hemp silica formed an open porosity with large air gaps between the particles and a water-resistance silica-based layer on the shiv surface producing a higher moisture resistance compared to hemp-lime systems. This paper focuses on the development of a novel fast-drying binder system with a potential for use in conjunction with other lingnocellular plant aggregates to form low-carbon and efficient multifunctional building materials.

KeywordsBio-aggregate; Hemp-Silica; Hemp-lime; Low-carbon; Bio-based building materials
JournalConstruction and Building Materials
Journal citation425 (Art. 136077)
ISSN0950-0618
Year2024
PublisherElsevier
Publisher's version
License
CC BY-NC-ND
File Access Level
Anyone
Digital Object Identifier (DOI)https://doi.org/10.1016/j.conbuildmat.2024.136077
Publication dates
Online03 Apr 2024
Print26 Apr 2024
Publication process dates
Accepted28 Mar 2024
Deposited15 Apr 2024
Copyright holder© 2024, The Authors
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