Municipal solid waste incineration (MSWI) ashes for greener concrete
Typ
Examensarbete för masterexamen
Program
Publicerad
2019
Författare
Glikson, Arnaud
López Menéndez, Sara
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
ABSTRACT
Owing to the varying characteristics of municipal solid waste incineration (MSWI)
ashes and the lack of harmonized standards and regulations, a substantial portion of
MSWI ashes are simply used as landfilling cover at the present, which can be better
utilized in the viewpoint of sustainability. This study aims at using and developing
experimental methods to assess the reactivity of MSWI ashes under alkaline activation
to evaluate their potential use as a binding agent.
A new test, solution test, was developed in this work and performed on two kinds of
MSWI ashes. The results were compared to an existing method, 𝑅 test. The solution
test and 𝑅 test involve different activators, such as 𝐶𝑎(𝑂𝐻), 𝑁𝑎𝑂𝐻 and 𝐾𝑂𝐻. The
reactivity of the reacted mixtures was mainly determined by thermogravimetric analysis
(TGA).
The experiment results from 𝑅 test revealed that a concrete pore solution
environment was not able to activate RISE BA (bottom ash) and STENA BA.
Portlandite did not act as a good enough activator. The experiment results from the
solution test showed that 𝑁𝑎𝑂𝐻 and 𝐾𝑂𝐻 activators added in order to reach a 𝑝𝐻 of
14, were able to activate RISE BA in addition to SLAG. However, STENA BA were still
inert.
Beskrivning
Ämne/nyckelord
Alkaline activation, bottom ashes, greener concrete, reactivity assessment, thermogravimetric analysis