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
| Authors | Ayati, 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. |
| Keywords | Bio-aggregate; Hemp-Silica; Hemp-lime; Low-carbon; Bio-based building materials |
| Journal | Construction and Building Materials |
| Journal citation | 425 (Art. 136077) |
| ISSN | 0950-0618 |
| Year | 2024 |
| Publisher | Elsevier |
| 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 | |
| Online | 03 Apr 2024 |
| 26 Apr 2024 | |
| Publication process dates | |
| Accepted | 28 Mar 2024 |
| Deposited | 15 Apr 2024 |
| Copyright holder | © 2024, The Authors |
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