Yuji Maeno*, Tokio Hirata* and Hideo Nagase**

* Kagoshima National College of Technology
** Kyushu Institute of Technology

+ Correspondence should be addressed to Yuji Maeno:
Department of Civil Engineering, Kagoshima National College of Technology
(1460-1 Shinko, Hayato-cho, Aira-gun, Kagoshima 899-5102 Japan)

Abstract

Municipal bottom ash is discharged by all regional incineration plants and is buried at final disposal sites as general solid waste. It is important to make good use of these sites. However, the soil mechanical properties of bottom ash isn't clearly understood. The particle properties of typical bottom ash were observed with a scanning type electron microscope in the study. Moreover, various tests including the isotropic consolidation test, drainage triaxial compression test, undrained triaxial compression test, compression test with K0-consolidation and compression test with mean principal effective stress constant were conducted. As result, the particle shape characteristics of bottom ash, the particle breakage property, critical state line, coefficient of earth pressure at rest, and dilatancy were investigated. Further, through a modified analysis of parameters considering a wide range of soil mechanical properties and qualities were obtained from these tests.

Key words: bottom ash, electron microscope photographs, critical state line, coefficient of earth pressure at rest, dilatancy