Acoustical properties of materials made of vegetable particles with several scales of porosity

By P. Glé, E. Gourdon, L. Arnaud. 2011

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Use of raw rice husk as natural aggregate in a lightweight insulating concrete: An innovative application (2014, background): “Indeed, three levels of porosity are mentioned, that of the binder (nanometric), inside hemp particles (on average 10 lm) and the intergranular macroporosity that can reach up to several millimeters [9,15].”
Overview on Biobased Building Material made with plant aggregate (2016, background): “Hempcrete is a material whose acoustic properties can vary greatly depending on the properties of its components and the way in which it is put to use [79, 80].”
Improved Sound Absorption Properties of Polyurethane Foam Mixed with Textile Waste (2016, background): “Thus, researchers have used and studied fibrous waste with various characteristics to obtain sound absorbing materials: corn cob [11], cotton [12], hemp fibers [13], jute fibers [14], textile fibers [15], agricultural waste [16], coconut fibers [17], cellulose fibers [18], tea-leaf fibers [19] and k”