Effect of incinerator bottom-ash composition on the mechanical behavior of backfill material

Chiou Liang Lin, Meng-Chia Weng*, Chih Hung Chang

*Corresponding author for this work

Research output: Contribution to journalArticle

15 Scopus citations


This study explores the influence of the chemical composition (SiO2, CaO, Fe2O3, and Al2O3) of incinerator bottom ash on its friction angle. Direct shear tests were performed to measure the strength of bottom ash with two distinctly different compositions. Then, an empirical equation was regressed to determine the correlation between each composition and the friction angle. The experimental results showed that the main constituent material of the incinerator bottom ash from general municipal wastes is SiO2, and the friction angle is 48.04°-52.66°. The bottom ash from incineration plants treating both municipal wastes and general industrial wastes has a high content of iron-aluminum oxides, and its friction angle is 44.60°-52.52°. According to the multivariate regression analysis result, the friction angle of bottom ash of any composition is influenced mainly by the Fe2O3 and Al2O3 contents. This study used the friction angle of the bottom ash from four different incineration plants to validate the empirical equation, and found that the error between actual friction angles and the predicted values was -1.36% to 5.34%. Therefore, the regressed empirical equation in this study can be employed in engineering applications to preliminarily identify the backfill quality of incinerator bottom ash.

Original languageEnglish
Pages (from-to)377-382
Number of pages6
JournalJournal of Environmental Management
StatePublished - 30 Dec 2012


  • Chemical composition
  • Friction angle
  • Incinerator bottom ash

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