Compressive strength and heavy metal leaching of concrete containing medical waste incineration ash: Fid-Bau Portal

Compressive strength and heavy metal leaching of concrete containing medical waste incineration ash

Akyıldız, Aylin / Köse, Esra Tınmaz / Yıldız, Aylin

Highlights•Medical waste incineration bottom ash was studied to investigate the usage of building materials.•S/S process was studied at different ratios of ash/cement mixture and two different curing times.•It was considered that the mixing ratio up to 15% was acceptable ratio.•The heavy metal concentrations was stabilized by solidification/stabilization process.•Statistical methods was used to investigate the selected range of binders combinations (cement and MWBA) influence on chosen performance characteristics of concrete.

AbstractThis paper provides the results of the study on solidification/stabilization (S/S) of medical waste incineration bottom ash (MWBA). S/S is a process reducing heavy metals leachability of materials, and so as permitting disposal of them in a sanitary landfill. This process can be also described as a recycling facility because the usability of solidified matrix as a building material according to mechanical characteristics. In this study, S/S process was studied at different ratios of ash/cement mixture (0%, 5%, 10%, 15%, 20%, 25%, 30%, 40% and 50%) and two different curing times (7days and 28days).The results of the study showed that S/S method can able to prevent the heavy metals leachability of MWBA. The concrete compressive strength decreased with increasing MWBA ratio. The compressive strength was 38MPa for 100% cement with 0% MWBA ratio. The compressive strength reduced to 11.3MPa when 50% cement was mixed with 50% MWBA. The data obtained from experimental study was also evaluated statistically.