Hemp-Straw Composites: Gluing Study and Multi-Physical Characterizations.

Area of Science:

• Materials Science
• Sustainable Engineering
• Biocomposites

Background:

• Growing demand for sustainable development necessitates eco-friendly building materials.
• Bio-based composites offer a viable alternative, utilizing renewable agro-resources.
• Previous research established the feasibility of wheat straw as a binder.

Purpose of the Study:

• To develop and evaluate fully bio-based composites using hemp as aggregate and wheat as binder.
• To compare hemp-straw composites with hemp-polysaccharides composites.
• To assess the gluing effect, mechanical properties, and thermal performance.

Main Methods:

• Chemical analysis and Scanning Electron Microscopy (SEM) to study the gluing effect.
• Multi-physical characterization of the developed composites.
• Evaluation of mechanical properties for insulating applications.
• Measurement of thermal conductivity.

Main Results:

• The developed hemp-straw composites demonstrated a viable gluing effect.
• Composites exhibited sufficient mechanical strength for use as insulating materials.
• Excellent thermal performance was observed, with low thermal conductivity (67.9-69.0 mW/(m·K)).

Conclusions:

• Fully bio-based composites from hemp and wheat show promise as sustainable building materials.
• These materials meet the requirements for effective thermal insulation.
• Further development can advance the use of agro-resources in construction.