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Waste Management & Research
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Utilization of bottom ash from the incineration of separated wastes as a cement substitute

Filip Kokalj

Faculty of Mechanical Engineering, University of Maribor,Maribor, Sloveniafiilip.kokalj{at}uni-mb.si

Niko Samec

Faculty of Mechanical Engineering, University of Maribor,Maribor, Slovenia

Bernardka Juri

Faculty of Civil Engineering, University of Maribor, Maribor, Slovenia, Projekt d.d., Nova Gorica, Kidriceva 9/a, Nova Gorica, Slovenia

Waste incineration is still an essential technology in the concept of integrated waste management. Most of the combustion residues are incinerator bottom ash. It has been discovered that incinerator bottom ash from the incineration of separated waste in the primary chamber of the modular two-stage incinerator mainly consists of metal oxides, especially SiO2 and CaO, in proportions that are quite similar to those in cement and so the feasibility of its application as a substitute for cement in concrete was investigated. It was found that after 28 days, the flexural and compressive strengths of the binder using bottom ash were practically comparable with those of a pure cement mixture. The results show that it is reasonable to use a binder containing incinerator bottom ash for applications in which an early-stage lower strength of concrete element is acceptable.

Key Words: Incinerator bottom ash • waste incineration • separated waste • concrete • wmr 814–8

Waste Management & Research, Vol. 23, No. 5, 468-472 (2005)
DOI: 10.1177/0734242X05057748
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