Abstract
The rapid development of industrialization, urbanization, and population of the society augments the rising amount of municipal solid waste (MSW). With the advantage of considerably reducing mass and volume of solid wastes and generating energy, the incineration is a widely used treatment method for MSW. During the incineration process, the organic substances contained in the wastes are combusted, and the massive residues are remained. Of the incineration residues, bottom ash takes up to 80–90%, and the remainders are fly ash along with air pollution control residues. Dealing with the municipal solid waste incineration (MSWI) bottom ash in a sustainable manner is the primary principle. Significantly, MSWI bottom ash has been successfully utilized in diverse beneficial applications in recent decades, especially in civil engineering applications. This paper investigates the mechanical properties and validity of MSWI bottom ash as applicable substitutes of conventional subgrade materials. For this reason, a series of direct shear and CBR tests are performed on specimens with different water contents and dry densities.
Highlights
Academic Editor: Marco Corradi e rapid development of industrialization, urbanization, and population of the society augments the rising amount of municipal solid waste (MSW)
In light of the road subgrade design specification JTG D30-2015, the CBR of municipal solid waste incineration (MSWI) bottom ash satisfies the requirements of CBR values as subgrade materials
To further verify the feasibility of MSWI as a subgrade alternative, a three-dimensional finite element model of pavement is established, and the response of pavement under moving load in the model is compared. e following conclusions are drawn: (1) e MSWI bottom ash after being crushed from Qizishan Waste Incineration Plant are comparable to the traditional aggregates in terms of particle size distribution, fines content, and compaction characteristics
Summary
Academic Editor: Marco Corradi e rapid development of industrialization, urbanization, and population of the society augments the rising amount of municipal solid waste (MSW). With the advantage of considerably reducing mass and volume of solid wastes and generating energy, the incineration is a widely used treatment method for MSW. Dealing with the municipal solid waste incineration (MSWI) bottom ash in a sustainable manner is the primary principle. Is paper investigates the mechanical properties and validity of MSWI bottom ash as applicable substitutes of conventional subgrade materials. For this reason, a series of direct shear and CBR tests are performed on specimens with different water contents and dry densities. E incineration process can reduce 70% of the mass and 90% of the volume in MSW [3], making it an appropriate treatment to dispose the large volume of waste and generate energy at the same time. MSWI bottom ash can be mixed with conventional granular materials or soil at different ratios as road base/subbase or subgrade layer. e geotechnical characteristics of these mixtures such as shear strength, resilient modulus, and California bearing capacity (CBR) are comparable to those of the widely used base/ subbase or subgrade materials [11, 19,20,21,22,23,24,25,26]
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