Compositional modelling and crushing behaviour of MSWI bottom ash material classes

Wouw, P.M.F. van de; Логинова, Е. Ю.; Florea, M.V.A.; Brouwers, Hjh Jos

doi:10.1016/j.wasman.2019.10.013

Cited by 20 publications

(3 citation statements)

References 73 publications

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“…C&D waste includes aggregates, brickbats, demolished concrete fragments, and ceramics; non-combustibles include metals and glass; combustibles include plastic, wood, cloths, rags, and paper. Sintered materials are porous quenched materials formed by the fusion of ash during incineration at high temperatures [17][18]. Both materials have approximately 65-70% of soil-like material, and the coarse fraction constitutes the remaining categories, as shown in Table 1.…”

Section: Compositional Analysismentioning

confidence: 99%

Suitability of Laboratory Compaction Procedure for Secondary Materials

Bansal¹,

Parida²,

Ramana³

et al. 2023

World Congress on Civil, Structural, and Environmental Engineering

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The present study evaluates the suitability of the modified proctor test (MPT) using single and multiple batch compactions for two types of secondary materials: reclaimed municipal solid waste (RMSW) and MSW incinerated bottom ash (IBA). In the single batch (SB) technique, the same sample is re-compacted for each successive moisture increment, whereas in the multiple batch (MB) technique, a fresh sample is used for each moisture content. The composition and grain size analysis have substantiated the compaction results of the materials in concern. The maximum dry density values for RMSW were observed to be identical in both SB (1.70-1.74 gm/cc) and MB (1.71-1.75 gm/cc) compaction, indicating no effect of the compaction technique on RMSW. In contrast, SB (1.74-1.80 gm/cc) overestimates the compaction characteristics of IBA compared to MB (1.65-1.69 gm/cc). IBA experiences higher particle crushing in SB compaction, leading to an increase in fines content in each successive compaction phase, resulting in an inaccurate estimation of compaction parameters. Weak constituents like glass and sintered material make the coarse fraction of IBA susceptible to higher particle crushing than RMSW, which was also evident from the aggregate impact test. It is recommended to use the SB compaction for estimating compaction characteristics of RMSW, whereas MB compaction is appropriate for IBA. This study is essential to ensure appropriate field compaction control for using secondary materials in embankments and pavements.

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Section: Compositional Analysismentioning

confidence: 99%

Suitability of Laboratory Compaction Procedure for Secondary Materials

Bansal¹,

Parida²,

Ramana³

et al. 2023

World Congress on Civil, Structural, and Environmental Engineering

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“…IBA from waste incineration consists of solid phases such as glass, ceramics, ash, and metals (ferrous, Fe; and non-ferrous, NFe) already contained in the MSW, as well as new phases that are formed during the incineration process [4][5][6][7]. The recovery of elemental metals from IBA is nowadays state-of-the-art technology for ferrous and also non-ferrous metals [8].…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Long-Term Leaching Behavior of Incineration Bottom Ash: A Study of Two Waste Incinerators in Germany

Simon,

Scholz

2023

Applied Sciences

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The long-term leaching behavior of incineration bottom ash (IBA) was studied with large-scale samples from two German waste incinerators with grate technology. The observation period was up to 281 days. The aging processes proceeded faster in the outdoor storage of the samples. The dominant factor in the leaching behavior is the pH, which starts at values above 12 and decreases to values below 10 (outdoors, <11 indoors). Most heavy metals exhibit minimum solubility in this pH range. The solubility of Sb depends on the prevailing Ca concentration, due to the formation of low-soluble Ca antimonate. The very low sulfate concentrations observed in the leaching tests with fresh IBA could be explained by the presence of ettringite. In the course of the aging reaction, ettringite is transformed into gypsum. The results from batch tests were compared with those from column tests, showing reasonable agreement. Leaching dynamics can be better followed with column tests. All results confirm that the use of IBA is possible under German law.

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“…On the other hand, the recycling treatment of the aged concrete structure can recover most of the original wastes as high quality fine and coarse recycle concrete aggregates and thus leave 10%-20% of fine concrete waste powder (Lu et al, 2018). The main components in waste powder are hydrated cement paste (HCP) but the exact composition can depend on the crushing and heating methods used to recycle concrete (He et al, 2020;Serpell and Lopez, 2013;van de Wouw et al, 2020;Yang et al, 2019). The waste powder can have a high water demand due to the porous structure and high surface area, along with a very low reactivity when used as a supplementary cementitious materials (SCMs) (He et al, 2020;Shi et al, 2016aShi et al, , 2016b, causing the difficulty in applying to normal concrete production without further treatment or activation (Kan and Demirboǧa, 2009;Spiesz et al, 2013;Yu et al, 2013).…”

Section: Introductionmentioning

confidence: 99%