Modified MSWI ash-mix slag for use in cement concrete

Lee, Tzen-Chin; Chang, Chieh-Jen; Rao, M. R. K.; Su, Xun-Wei

doi:10.1016/j.conbuildmat.2010.08.007

Cited by 16 publications

(9 citation statements)

References 18 publications

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“…The compressive strength of W200 was close to that of the reference mixture. This increase in strength may be due to pozzolanic reactions, as reported by previous researchers [ 19 ]. The amount of WIBA replacement for cement, up to 20 per cent, did not seem to have a significant adverse effect on strength.…”

Section: Resultssupporting

confidence: 73%

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Influence of melted incinerator ash on durability and corrosion behaviour of reinforced concrete

Cheng

Huang

et al. 2011

Proceedings of the Institution of Mechanical Engineers, Part L:

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This study investigates the effects of incinerator bottom ash (IBA) fineness and the cooling process of molten IBA on the durability of concrete and the corrosion of rebar. Two finenesses of an original IBA, i.e. pulverized incinerator bottom ash (PIBA) powder with maximum particle sizes of 0.6 and 0.074 mm, were used to partially replace Portland cement at 20 per cent by weight. In addition, the powder was also obtained by melting the PIBA (<0.6 mm) in an electric-furnace at 1450 °C for 1 h and chilling it by quenching in water (WIBA, water-cooled melted incinerator bottom ash) and air (AIBA, air-cooled melted incinerator bottom ash). The powder was then ground in a ball mill until the particle size reached less than 0.074 mm. This study also presents the experimental results on the compressive strength, mercury intrusion porosimetry, scanning electron microscopy (SEM), and X-ray diffraction of concrete samples containing different types of IBA. This study uses the initial surface absorption test and rapid chloride penetration test to measure the absorption and the ability of different concrete samples to resist chloride ions. Cylindrical specimens were cast and exposed to 3.5 per cent NaCl solution under a direct current density (0.5 m A/cm2) to accelerate the corrosion process. The open circuit potential and direct current polarization resistance were obtained to evaluate the rebar corrosion. Results indicate that WIBA concrete achieved a compressive strength similar to reference specimens after 28 days of curing; WIBA and AIBA exhibited an increase in unit weight and workability when used as a replacement for cement. However, IBA can be processed by melting to regain reactive pozzolanic activity, which may be used to partially replace cement. The incorporation of WIBA and AIBA decreased the total capillary pore porosity of the mortars compared to ordinary PIBA. The large particle size of PIBA produced lower hydraulic properties than finer particles. The improved properties of WIBA and AIBA resulted from the dense structure achieved by the filling effect of the pozzolanic product. Strength activity index results, SEM, X-ray analysis, and the rate of ISA observations confirm these findings. Utilizing a proper amount of WIBA and AIBA significantly improved the chloride and corrosion resistance of rebar in concrete in this study. Therefore, WIBA and AIBA can act as cementitious materials in cement-based composites.

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Section: Resultssupporting

confidence: 73%

“…The compressive strength of W200 was close to that of the reference mixture. This increase in strength may be due to pozzolanic reactions, as reported by previous researchers[19]. AIBA, and PIBA at 3, 7, 28, and 56 days.…”

supporting

confidence: 77%

Influence of melted incinerator ash on durability and corrosion behaviour of reinforced concrete

Cheng

Huang

et al. 2011

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…Lee et al studied the effect of 20% cement replacement by vitrified slag made from fly ash and scrubber ash mix proportioned 1:3, with waste glass frit added to adjust the basicity of the mix. Leaching values of slags were well below the threshold limits, and the compressive strengths of mortars at 56 and 90 days were 5–10% more than those of the reference OPC mixes [ 130 , 131 ]. Lin et al manufactured vitrified slag from a 50–50 mix of 1:3 fly ash scrubber ash mix and sludge from LED manufacturing.…”

Section: Utilization Of Mswi Bottom Ash In Building Materialsmentioning

confidence: 98%

The Use of Municipal Solid Waste Incineration Ash in Various Building Materials: A Belgian Point of View

Snellings²,

et al. 2018

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Huge amounts of waste are being generated, and even though the incineration process reduces the mass and volume of waste to a large extent, massive amounts of residues still remain. On average, out of 1.3 billion tons of municipal solid wastes generated per year, around 130 and 2.1 million tons are incinerated in the world and in Belgium, respectively. Around 400 kT of bottom ash residues are generated in Flanders, out of which only 102 kT are utilized here, and the rest is exported or landfilled due to non-conformity to environmental regulations. Landfilling makes the valuable resources in the residues unavailable and results in more primary raw materials being used, increasing mining and related hazards. Identifying and employing the right pre-treatment technique for the highest value application is the key to attaining a circular economy. We reviewed the present pre-treatment and utilization scenarios in Belgium, and the advancements in research around the world for realization of maximum utilization are reported in this paper. Uses of the material in the cement industry as a binder and cement raw meal replacement are identified as possible effective utilization options for large quantities of bottom ash. Pre-treatment techniques that could facilitate this use are also discussed. With all the research evidence available, there is now a need for combined efforts from incineration and the cement industry for technical and economic optimization of the process flow.

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“…The HMs (e.g., Zn Cr, Cu, and Pb) concentration of leachates from the modified slag was significantly lower than the unmodified slag. Similarly, the reactivity of MSWI FA slag can be improved by comelting with MSWI scrubber ash [171,172] or chemical mechanical polishing sludge [173]. The 28d strengths of hydrated systems blended with modified slag were comparable or higher than those of OPC.…”

Section: Use As Cement Substitutes (Supplementary Cementitious Materials)mentioning

confidence: 99%

Municipal Solid Waste Incineration Ash-Incorporated Concrete: One Step towards Environmental Justice

2021

Buildings

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Municipal solid waste and cement manufacture are two sources of environmental justice issues in urban and suburban areas. Waste utilization is an attractive alternative to disposal for eliminating environmental injustice, reducing potential hazards, and improving urban sustainability. The re-use and recycling of municipal solid waste incineration (MSWI) ash in the construction industry has drawn significant attention. Incorporating MSWI ash in cement and concrete production is a potential path that mitigates the environmental justice issues in waste management and the construction industry. This paper presents a critical overview of the pretreatment methods that optimize MSWI ash utilization in cement/concrete and the influences of MSWI ash on the performance of cement/concrete. This review aims to elucidate the potential advantages and limitations associated with the use of MSWI ash for producing cement clinker, alternative binder (e.g., alkali-activated material), cement substitutes, and aggregates. A brief overview of the generation and characteristics of MSWI ash is reported, accompanied by identifying opportunities for the use of MSWI ash-incorporated products in industrial-scale applications and recognizing associated environmental justice implications.

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Modified MSWI ash-mix slag for use in cement concrete

Cited by 16 publications

References 18 publications

Influence of melted incinerator ash on durability and corrosion behaviour of reinforced concrete

Influence of melted incinerator ash on durability and corrosion behaviour of reinforced concrete

The Use of Municipal Solid Waste Incineration Ash in Various Building Materials: A Belgian Point of View

Municipal Solid Waste Incineration Ash-Incorporated Concrete: One Step towards Environmental Justice

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