Mechanical properties of incineration bottom ash: The influence of composite species |
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| Authors: | Meng-Chia Weng Chiou-Liang Lin Chun-I Ho |
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| Institution: | 1. CERIS-ICIST, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal;2. School of Civil Engineering, University of Birmingham, B15 2TT, UK;3. Applying Concrete Knowledge, 1A Blackened Avenue, Birmingham, B17 8AP, UK;1. Department of the Built Environment, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands;2. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, PR China;1. State Key Laboratory of Silicate Materials for Architectures (Wuhan University of Technology), Wuhan 430070, PR China;2. Magnel Laboratory for Concrete ResearchMagnel Laboratory for Concrete Research, Ghent University, Technologiepark-Zwijinaarde 904, 9052 Ghent, Belgium;3. School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan 430074, PR China;1. The State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China;2. School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, PR China;3. Graduate School of Environmental Studies, Tohoku University, 6-6-06 Aza-Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan;4. Department of Civil and Environmental Engineering, Graduate school of Engineering, Tohoku University, 6-6-06 Aza-Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan |
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| Abstract: | The mechanical properties, including strength, deformational behavior, and wetting softening phenomena of municipal solid waste incinerator (MSWI) bottom ash are one of the major concerns for reuse applications. However, owing to the complex constituents of municipal solid waste, the properties of MSWI bottom ash are often highly variable. A series of artificial specimens with controlled chemical components were tested in this study. The test results show that the artificial bottom ash possesses the following mechanical characteristics: (1) for the strength, the frictional angles of the bottom ash under dry and saturated conditions vary from 34.8° to 51.1° and 26.0° to 37.2°, respectively; (2) for the deformation, the shear stiffness increases with the normal stress arises and degrades upon increased shearing; (3) significant wetting degradation of the strength and stiffness were observed.The multi-variable regression analysis was conducted to evaluate the associated influence of the chemical components on the strength. Among the evaluated components, Fe2O3 and Al2O3 are key factors; an increase in either results in higher strength at both dry and saturated conditions. The results were used to propose empirical relationships for ?dry and ?sat, expressed in terms of Fe2O3 and Al2O3. Accordingly, a strength classification chart is proposed for engineering purposes. |
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