Physical and mechanical properties of municipal solid waste incineration residues with cement and coal fly ash using X-ray Computed Tomography scanners
- 16 Downloads
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.
Keywordsmechanical property municipal solid waste incineration residues coal fly ash unconfined compression test image analysis X-Ray Computed Tomography scanners
Unable to display preview. Download preview PDF.
This research was supported by the Environment Research and Technology Development Fund (3K143001) of the Ministry of the Environment, Japan.
- 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–S84CrossRefGoogle Scholar
- 4.Kamon M, Katsumi T, Sano Y. Stabilization of municipal waste incineration fly ash. In: Proceedings of the 1st National Symposium on Environmental Geotechnology, Japanese Geotechnical Society, 1994, 231–238 (in Japanese)Google Scholar
- 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)Google Scholar
- 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, 1824–1828Google Scholar
- 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, TorontoGoogle Scholar
- 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: 436–448CrossRefGoogle Scholar
- 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, 2013Google Scholar
- 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, ParisGoogle Scholar
- 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): 113–120Google Scholar