Komunalinių atliekų deginimo metu susidarančio šlako panaudojimas kelių tiesyboje

Abstract

More than 140 million tonnes of municipal waste is incinerated annually. The residues produced during incineration are composed of municipal solid waste incinerator (MSWI) bottom ash (approximately 85–95%) and fly ash (approximately 5–15%). Both of them are typically landfilled. Since physical and mechanical properties of MSWI bottom ash are similar to those of natural aggregates, the possibility to use MSWI bottom ash in civil engineering gets more and more attention. In 2016, a public limited liability company “Fortum Heat Lietuva” initiated a research to identify the most promising application areas of MSWI bottom ash. The research was conducted by different departments of Vilnius Gediminas technical university. It revealed that MSWI bottom ash is the most suitable for road construction. Consequently, further research was focused on this particular area. A four year research conducted by Road research Institute of Vilnius Gediminas technical university showed that MSWI bottom ash is suitable to construct the subgrade, unbound sub-base and base courses as well as embankments up to 3 m height, improve the soil, backfill the engineering trenches and reclaim the landfill. The application of MSWI bottom ash to construct unbound sub-base and base course will be proved by the tests on site. An experimental road sections with pavement structures of natural aggregates and MSWI bottom ash is under construction. MSWI bottom ash will be used to construct layer of frost resistant material and base course of crushed stone (in this case, a crushed stone of 16-45 mm will be added).