Sustainable High Quality Recycling of Aggregates from Waste-to-Energy, Treated in a Wet Bottom Ash Processing Installation, for Use in Concrete Products
作者： Philip Van den Heede , Niels Ringoot , Arno Beirnaert , Andres Van Brecht , Erwin Van den Brande
DOI: 10.3390/MA9010009
关键词: Incineration 、 Waste management 、 Bottom ash 、 Materials science 、 Porosity 、 Aggregate (composite) 、 Waste-to-energy 、 Incinerator bottom ash 、 Compressive strength 、 Durability
摘要: Nowadays, more efforts towards sustainability are required from the concrete industry. Replacing traditional aggregates by recycled bottom ash (BA) municipal solid waste incineration can contribute to this goal. Until now, only partial replacement has been considered keep workability, strength and durability under control. In research, feasibility of a full aggregate was investigated for producing prefabricated Lego bricks. It found that compressive class purpose (C20/25) could be achieved. Nevertheless, thorough understanding BA properties is needed overcome other issues. As highly absorptive, concrete's water demand high. This workability issue dealt with subjecting fine fraction crushing operation eliminate porous elements pre-wetting coarse fractions in controlled manner. addition, reactive NaOH washing avoid formation longitudinal voids resulting expansion due metallic aluminum present BA. Regarding long-term behavior, heavy metal leaching freeze-thaw exposure not problematic, though there susceptibility acetic lactic acid attack maybe increased sensitivity alkali-silica reaction.
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