Abstract
This work investigates the acoustical and related non-acoustical properties of soil substratum that is used on vegetative noise barriers and green walls. The following effects are studied in the laboratory: (i) soil moisture content, (ii) soil blending with porous recycled materials, and (iii) multi-layering of soil with porous recycled materials. The acoustic absorption and surface impedance measurements are carried out using a standard 100-mm impedance tube. The flow resistivity measurements are carried out using a calibrated flow resistivity apparatus having the diameter of 100 mm. Samples of soil substratum are prepared in a specially designed sample holder that enables accurate control of the moisture content, porosity, material compaction, and soil density. The observed experimental data are used to validate the theoretical predictions which are based on a model that requires the knowledge of the flow resistivity, porosity, tortuosity, and pore size distribution of soil and recycled porous media.
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