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Materials 2016, 9(1), 9; doi:10.3390/ma9010009

Sustainable High Quality Recycling of Aggregates from Waste-to-Energy, Treated in a Wet Bottom Ash Processing Installation, for Use in Concrete Products

1
Magnel Laboratory for Concrete Research, Ghent University, Technologiepark Zwijnaarde 904, Ghent B-9052, Belgium
2
Indaver nv, Dijle 17a, Mechelen B-2800, Belgium
*
Author to whom correspondence should be addressed.
Academic Editor: Jorge de Brito
Received: 9 October 2015 / Revised: 8 December 2015 / Accepted: 21 December 2015 / Published: 25 December 2015
(This article belongs to the Special Issue Utilisation of By-Product Materials in Concrete)
View Full-Text   |   Download PDF [2452 KB, uploaded 25 December 2015]   |  

Abstract

Nowadays, more efforts towards sustainability are required from the concrete industry. Replacing traditional aggregates by recycled bottom ash (BA) from municipal solid waste incineration can contribute to this goal. Until now, only partial replacement has been considered to keep the concrete workability, strength and durability under control. In this research, the feasibility of a full aggregate replacement was investigated for producing prefabricated Lego bricks. It was found that the required compressive strength class for this purpose (C20/25) could be achieved. Nevertheless, a thorough understanding of the BA properties is needed to overcome other issues. As BA is highly absorptive, the concrete’s water demand is high. This workability issue can be dealt with by subjecting the fine BA fraction to a crushing operation to eliminate the porous elements and by pre-wetting the fine and coarse BA fractions in a controlled manner. In addition, a reactive NaOH washing is needed to avoid formation of longitudinal voids and the resulting expansion due to the metallic aluminum present in the BA. Regarding the long-term behavior, heavy metal leaching and freeze-thaw exposure are not problematic, though there is susceptibility to acetic and lactic acid attack and maybe increased sensitivity to alkali-silica reaction. View Full-Text
Keywords: municipal solid waste incineration; bottom ash; concrete; aggregate replacement; prefabricated Lego brick municipal solid waste incineration; bottom ash; concrete; aggregate replacement; prefabricated Lego brick
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Van den Heede, P.; Ringoot, N.; Beirnaert, A.; Van Brecht, A.; Van den Brande, E.; De Schutter, G.; De Belie, N. Sustainable High Quality Recycling of Aggregates from Waste-to-Energy, Treated in a Wet Bottom Ash Processing Installation, for Use in Concrete Products. Materials 2016, 9, 9.

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