Abstract
The results show that the variation in the swelling rate of some samples analysed describes a sinusoid with values higher than those recommended by the AINSI A 208.1 1999 standard. The use of these panels in a dry environment is therefore strongly recommended. The Young's modulus of elasticity (YME) and the breaking Modulus of Rupture (MOR) of the composite materials are between 0.91 and 2.31 GPa and 5.39 and 16.43 MPa. These values meet the 1999 ANSI 208.1 standard, which requires that the YEM and MOR of insulation boards in buildings be greater than or equal to 550 MPa and 3 MPa, respectively. Deformation at break varies between 8.40 and 13.05 mm. These values explain the non-ductile behaviour of these materials. Finally, the evolution of the mechanical properties of the material (Flexural Modulus of Elasticity (FME), MOR and deformation) as a function of the binder rate and the particle size distribution indicate that the presence of starch in the small particle sizes (≤ 0.425mm) favours the increase in the rigidity of the material. The breaking strength of the material (small granulometry) is greater with starch proportions ranging from 10 to 15%. The presence of the binder in the composite, whatever the granulometry, changes the behaviour of the material by increasing its deformation at breakage. With regard to flexural behaviour, typha particles with a particle size between 0.425 mm and 1.25 mm with a binder content of 10% to 15% are therefore more ductile. With these characteristics, the formulations M1 (10% starch; 0.425 mm) and M4 (15% starch; 0.425 mm) indicate the best mechanical properties.
Highlights
The control of indoor thermal comfort is important for the well-being of the occupants in the habitat
Used insulating materials are of synthetic origin, but nowadays biosourced insulation of animal or vegetable origin is increasingly experienced in construction [3]
The results showed that the thermal conductivity decreases by about 10% when the proportion and/or the length of the fibres increases, confirming the capacity of the fibres to provide thermal insulation [3]
Summary
The control of indoor thermal comfort is important for the well-being of the occupants in the habitat. To achieve this objective, several solutions are possible, mainly the insulation of the roof and walls to improve the thermal environment in the habitat [1, 2]. Several studies have focused on determining the thermophysical and mechanical characteristics of these materials in order to better integrate them into buildings. Osseni et al [4] have determined the thermal characteristics of coconut fibre-doped cement mortars using the asymmetric hot-plane method with a temperature measurement. Insulating panels made from agricultural residues have been the subject of several research studies and publications. Younquist et al [5] and Younquistet
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