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2015 ; 9
(1
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Sustainable High Quality Recycling of Aggregates from Waste-to-Energy, Treated in
a Wet Bottom Ash Processing Installation, for Use in Concrete Products
#MMPMID28787809
Van den Heede P
; Ringoot N
; Beirnaert A
; Van Brecht A
; Van den Brande E
; De Schutter G
; De Belie N
Materials (Basel)
2015[Dec]; 9
(1
): ä PMID28787809
show ga
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.