Physical and mechanical properties of municipal solid waste incineration residues with cement and coal fly ash using X-ray Computed Tomography scanners

Abstract

A significant volume of Municipal Solid Waste incineration bottom ash and fly ash (i.e., incineration residues) are commonly disposed as landfill. Meanwhile, reclamation of landfill sites to create a new land space after their closure becomes an important goal in the current fewer and fewer land availability scenario in many narrow countries. The objective of this study is to reclaim incineration residue materials in the landfill site by using cement and coal fly ash as stabilizers aiming at performing quality check as new developed materials before future construction. Indeed, physical and mechanical properties of these new materials should be initially examined at the micro scale, which is the primary fundamental for construction at larger scale. This research examines quantitative influences of using the combination of cement and coal fly ash at different ratio on the internal structure and ability of strength enhancement of incineration residues when suffering from loading. Couple of industrial and micro-focus X-ray computed tomography (CT) scanners combined with an image analysis technique were utilized to characterize and visualize the behavior and internal structure of the incineration residues-cement-coal fly ash mixture under the series of unconfined compression test and curing period effect. Nine types of cement solidified incineration residues in term of different curing period (i.e., 7, 14, 28 days) and coal fly ash addition content (i.e., 0%, 9%, 18%) were scanned before and after unconfined compression tests. It was shown that incineration residues solidified by cement and coal fly ash showed an increase in compression strength and deformation modulus with curing time and coal fly ash content. Three-dimension computed tomography images observation and analysis confirmed that solidified incineration residues including incineration bottom and fly ash as well as cement and coal fly ash have the deliquescent materials. Then, it was studied that stabilized parts play a more important role than spatial void distribution in increment or reduction of compression strength.

Keywords

mechanical property / municipal solid waste incineration residues / coal fly ash / unconfined compression test / image analysis / X-Ray Computed Tomography scanners

References

[1] Del Valle-Zermeño R, Formosa J, Chimenos J M, Martínez M, Fernández A I. Aggregate material formulated with MSWI bottom ash and APC fly ash for use as secondary building material. Waste Management, 2013, 33(3): 621–627

[2] Birgisdóttir H, Bhander G, Hauschild M Z, Christensen T H. Life cycle assessment of disposal of residues from municipal solid waste incineration: recycling of bottom ash in road construction or landfilling in Denmark evaluated in the ROAD-RES model. Waste Management, 2007, 27(8): S75–S84

[3] Xiao Y, Oorsprong M, Yang Y, Voncken J H L. Vitrification of bottom ash from a municipal solid waste incinerator. Waste Management, 2008, 28(6): 1020–1026

[4] Kamon M, Katsumi T, Sano Y. Stabilization of municipal waste incineration fly ash. In: Proceedings of the First National Symposium on Environmental Geotechnology, Japanese Geotechnical Society, 1994, 231–238 (in Japanese)

[5] Kamon M, Katsumi T, Sano Y. MSW fly ash stabilized with coal ash for geotechnical application. Journal of Hazardous Materials, 2000, 76(2–3): 265–283

[6] Arm M. Variation in deformation properties of processed MSWI bottom ash: results from triaxial tests. Waste Management, 2004, 24(10): 1035–1042

[7] Lan N C, Inui T, Ikeda K, Katsumi T. Aging effects on the mechanical property of waste mixture in coastal landfill sites. Soils and Foundations, 2015, 55(6): 1441–1453

[8] Sato K, Matsumura K, Yoshida N, Shimaoka T, Miyawaki K, Hanashima M. Dynamic characteristics of incineration residue under different curing conditions. In: Proceedings of the 4th JGS Symposium on environmental mental Geotechnics, Japanese Geotechnical Society, 2001, 55–58 (in Japanese)

[9] Lan N C, Inui T, Ikeda K, Katsumi T. Scale effects on the shear strength of waste in coastal landfill sites. In: Proceedings of the 15th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering. Japanese Geotechnical Society Special Publication, 2016, 1824–1828

[10] Shibi T, Kamei T. Effect of freeze-thaw cycles on the strength and physical properties of cement-stabilised soil containing recycled bassanite and coal ash. Cold Regions Science and Technology, 2014, 106–107: 36–45

[11] Fakhimi A, Gharahbagh E A. Discrete element modeling of the influence of void size and distribution on the mechanical behavior of rock. In: Proceedings of the 3rd CANUS Rock Mechanics Symposium, 2009, Toronto

[12] Dewanckele J, De Kock T, Boone M A, Cnudde V, Brabant L, Boone M N, Fronteau G, Van Hoorebeke L, Jacobs P. 4D imaging and quantification of pore structure modifications inside natural building stones by means of high resolution X-ray CT. Science of the Total Environment, 2012, 416: 436–448

[13] Masad E, Saadeh S, Al-Rousan T, Garboczi E, Little D. Computations of particle surface characteristics using optical and X-ray CT images. Computational Materials Science, 2005, 34(4): 406–424

[14] Jerram D A, Mock A, Davis G R, Field M, Brown R J. 3D crystal size distributions: a case study on quantifying olivine populations in kimberlites. Lithos, 2009, 112: 223–235

[15] Otani J, Mukunoki T, Kikuchi Y. Visualization for engineering property of in-situ light weight soild with air foams. Soils and Foundations. Japanese Geotechnical Society, 2002, 42(3): 93–105

[16] Daly M, Leonard F, Sharples J K, Sherry A H. Advanced assessment of ductile tearing in nuclear reactor pressure vessel steel using X-ray tomography. In: Proceedings of the 13th International Conference on Fracture. Beijing, China, 2013

[17] Singh K, Niven R K, Senden T J, Turner M L, Sheppard A P, Middleton J P, Knackstedt M A. Remobilization of residual non-aqueous phase liquid in porous media by freeze-thaw cycles. Environmental Science & Technology, 2011, 45(8): 3473–3478

[18] Mukunoki T, Mikami K. Study on mechanism of two-phase flow in porous media using X-ray CT Image Analysis. In: Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering, 2013, Paris

[19] Peth S, Nellesen J, Fischer G, Horn R. Non-invasive 3D analysis of local soil deformation under mechanical and hydraulic stresses by micro CT and digital image correlation. Soil & Tillage Research, 2010, 111(1): 3–18

[20] Promentilla M A B, Sugiyama T. X-ray microtomography of mortars exposed to freezing-thawing action. Journal of Advanced Concrete Technology, 2010, 8(2): 97–111

[21] Taylor H F, O’Sullivan C, Sim W W. A new method to identify void constrictions in micro-CT images of sand. Computers and Geotechnics, 2015, 69: 279–290

[22] Mukunoki T, Miyata Y, Mikami K, Shiota E. X-ray CT analysis of pore structure in sand. Solid Earth, 2016, 7(3): 929–942

[23] Otani J, Mukunoki T, Obara Y. Application of X-ray CT method for characterization of failure in soils. Soils and Foundations. Japanese Geotechnical Soctiey, 2000, 40(2): 113–120

Acknowledgements

This research was supported by the Environment Research and Technology Development Fund (3K143001) of the Ministry of the Environment, Japan.

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