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    Title: The Effects of the Mechanical-Chemical Stabilization Process for Municipal Solid Waste Incinerator Fly Ash on the Chemical Reactions in Cement Paste
    Authors: Chen, Cheng-Gang;Sun, Chang-Jung;Gau, Sue-Huai;Wu, Ching-Wei;Chen, Yu-Lun
    Contributors: 淡江大學水資源及環境工程學系
    Keywords: Milling process;Municipal solid waste incinerator fly ash;Pozzolanic reaction;C–S–H;Stabilization,Heavy metal
    Date: 2013-04-01
    Issue Date: 2015-01-28 11:08:16 (UTC+8)
    Publisher: Kidlington: Pergamon Press
    Abstract: A water extraction process can remove the soluble salts present in municipal solid waste incinerator (MSWI) fly ash, which will help to increase the stability of the synthetic materials produced from the MSWI fly ash. A milling process can be used to stabilize the heavy metals found in the extracted MSWI fly ash (EA) leading to the formation of a non-hazardous material. This milled extracted MSWI fly ash (MEA) was added to an ordinary Portland cement (OPC) paste to induce pozzolanic reactions. The experimental parameters included the milling time (96 h), water to binder ratios (0.38, 0.45, and 0.55), and curing time (1, 3, 7 and 28 days). The analysis procedures included inductively coupled plasma atomic emission spectroscopy (ICP/AES), BET, mercury intrusion porosimetry (MIP), X-ray diffraction (XRD), and nuclear magnetic resonance (NMR) imaging. The results of the analyses indicate that the milling process helped to stabilize the heavy metals in the MEA, with an increase in the specific surface area of about 50 times over that of OPC. The addition of the MEA to the OPC paste decreased the amount of Ca(OH)2 and led to the generation of calcium–silicate–hydrates (C–S–H) which in turned increased the amount of gel pores and middle sized pores in the cement. Furthermore, a comparison shows an increase in the early and later strength over that of OPC paste without the addition of the milled extracted ash. In other words, the milling process could stabilize the heavy metals in the MEA and had an activating effect on the MEA, allowing it to partly substitute OPC in OPC paste.
    Relation: Waste Management 33(4), pp.858-865
    DOI: 10.1016/j.wasman.2012.12.014
    Appears in Collections:[水資源及環境工程學系暨研究所] 期刊論文

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