Optimal Use of MSWI Bottom Ash in Concrete

Abstract

An experimental investigation was carried out to evaluate the mechanical properties of concrete mixtures in which coarse aggregate was partially (30, 50 or 70 %) replaced with pre-washed municipal solid waste incineration (MSWI) bottom ash. Results indicated that bottom ash reduced the compressive strength, elastic modulus, and levels of heavy metals in leachate when used as a replacement for gravel, and that the maximum amount of MSWI bottom ash in concrete should not exceed 50 %. To analyze the effect mechanism of bottom ash in concrete, the degree of hydration and the following pozzolanic reaction characterized by the pozzolanic activity index, and the porosity distribution in cement mortar. The study indicates that improved properties of concrete are not solely later strength gain and reduced levels of heavy metals in leachate but also the progression of pozzolanic reactions, where a dense structure contains a higher proportion of fine pores that are related to durability.

Environmental sustainability assessment of the management of municipal solid waste incineration residues: a review of the current situation

“…The cause of this effect was assigned to the high content of zinc and lead that could slow down concrete setting time forming a protective layer on cement grains (Quenee et al 2000). Furthermore, some studies have observed that initial and final setting time increased with the amount of cement replaced with BA (Zhang and Zhao 2014). To prevent the formation of spots or rust near concrete surface or expansion and road destruction, many authors suggested the application of a pre-treatment on BA as metal removal (Shih et al 2003;Pecqueur et al 2001) or thermal treatment ) in order to reduce the content of metals and enhance their mechanical properties.…”

Ability of Two Dam Fine-Grained Sediments to be Used in Cement Industry as Raw Material for Clinker Production and as Pozzolanic Additional Constituent of Portland-Composite Cement

“…sugar cane bagasse [30], rice husk [31,32], barley husk [32]), thermally activated waste from rock extraction activity [33] or bottom ashes coming from municipal solid waste incineration [34].…”

MSWI Bottom Ash Utilization in Concrete Mixes

“…Pastaraisiais metais pasaulinėje mokslinėje periodinėje spaudoje paskelbta nemažai publikacijų, susijusių su pelenų naudojimu betono mišiniams gaminti. Galima paminėti Van der Wegen et al (2013), Aggarwal, Sliddique (2014), Zhang, Zhao (2014), Kuo et al (2013), Lam et al (2010), Bertolinia et al (2004) darbus. Išskirtini Zhang, Zhao (2014), Collepardi et al (2015) darbai, kuriuose papildomai aukšta temperatūra paveikti dugno pelenai panaudoti inovatyvaus lengvojo ir savaime sutankėjančio betono mišinių gamybai.…”