Influence de la taille des fibres de coco sur les propriétés thermiques et mécaniques des mortiers de terre

Abstract

Influence of coconut fiber size on the thermal and mechanical properties of earthen mortars

In the interest of using more ecological materials, a renewed interest in local materials made from earth and plant fibers is becoming an interesting alternative compared to traditional materials (concrete, sand-cement mortar, steel, glass, carbon, aramid, asbestos). This study focuses primarily on fibers extracted from coconut husks to develop composite materials. Indeed, the high consumption of coconut in various forms generates a lot of waste that is abandoned in nature. Recycling this waste could be an economic opportunity while also protecting the environment. Furthermore, transposing ecological construction materials into a contemporary context requires tests to attest to their fundamental properties. Different samples of a claycement mixture, containing different lengths of coconut fibers with a mass content of 1%, were prepared and subjected to physical (bulk density and thermal conductivity) and mechanical tests. The thermal conductivity tests carried out on mortar containing coconut fibers show that dry mortars containing coconut fiber are very good thermal insulators, unlike the dry control mortar. These materials have a thermal conductivity of around 0.1 W m-1 K-1, which makes them good insulators. The addition of fibers to the earth-cement mortar allows the material’s brittle behavior to be changed to ductile behavior. Dry mortars containing coconut fibers can therefore be used as a construction material (cob, rammed earth, etc.) and thermal insulation materials.

https://doi.org/10.70974/mat09225274