Effect of chemical treatment of MSWI bottom ash for its use in concrete

    Authors

    J. Kim; B. H. Nam; B. A. Al Muhit; K. M. Tasneem;J. An

    Comments

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    Abbreviated Journal Title

    Mag. Concr. Res.

    Keywords

    RECYCLED AGGREGATE CONCRETE; FLY-ASH; SILICA FUME; CONSTRUCTION; Construction & Building Technology; Materials Science, Multidisciplinary

    Abstract

    In this paper, municipal solid waste incineration (MSWI) bottom ash was characterised before and after chemical treatment and the effect of ash addition on the performance of concrete as a partial replacement of fine aggregate was evaluated. The chemical treatment aimed to eliminate the side effect of MSWI ash - the creation of a network of bubbles - which can eventually lead to a significant reduction of the overall performance of concrete. Petrographic examinations, energy dispersive X-ray spectroscopy and X-ray diffraction, were carried out to chemically characterise the MSWI bottom ash. The mechanical performance of the ash-combined concrete was evaluated by measuring its compressive strength. Analysis of the measured data demonstrates that the chemical treatment successfully transformed metallic aluminium in the ash into a stable form and hence expansion of the concrete due to hydrogen gas evolution was no longer detected in the concrete containing treated ash. Consequently, compared with specimens with untreated ash, concrete specimens with treated bottom ash showed improved performance.

    Journal Title

    Magazine of Concrete Research

    Volume

    67

    Issue/Number

    4

    Publication Date

    1-1-2015

    Document Type

    Article

    Language

    English

    First Page

    179

    Last Page

    186

    WOS Identifier

    WOS:000352193600002

    ISSN

    0024-9831

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