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In tanneries, only approx. one-third of the total mass of raw hides and skins is converted to finished leather, while two-thirds become either dissolved or solid waste. As part of the natural materials category, usually considered waste, leather fibers introduced into cement mortar panels play a fundamental role in construction due to both insulation properties and mechanical strength. Waste is introduced as a powder or filler or as aggregates in the concrete mix, with energy, economic and environmental benefits. ...

Sustainable and ecofriendly engineering requires the use of high amounts of recycled materials. Extensive amounts of building materials required for construction of roads facilitates the use of recycled old surfaces from the ecological and economical point of view. Reconstruction and development of new roads requires acquisition and processing of different materials such as: soils, aggregates acquired from unbound layers, concrete and asphalt surfaces, and particularly hazardous surfaces with tar bonding agent. Af...