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Doprinos proučavanju kompozita napravljenog od otpadnih materijala termoelektrana
Some contributions to the examination of composites from power plant wastes
Projekat: Izučavanje mogućnosti valorizacije preostalih rezervi uglja u cilju obezbeđenja stabilnosti energetskog sektora Republike Srbije (MPNTR - 33029)
Keywords: fly-ash; bottom ash; flue gas desulphurization gypsum; road construction
Sažetak
Ovaj rad istražuje mogućnosti korišćenja sva tri tipa čvrstog otpadnog materijala termoelektrana: letećeg pepela (FA), sulfogipsa (FGD gips) i šljake (BA) kao komponenti za izradu kompozita koji će se koristiti za izradu podloge puteva. Ispitivane su dve smeše: 1. otpadni materijal termoelektrana-Portland cement (PC) i 2. otpadni materijal termoelektrana-pesak (S) i Portland cement (PC). Maseni odnos komponenti u smešama bio je: 1. FA - FGD gips - BA - PC = 2 : 1.5 : 5 : 1.5 i 2. FA - FGD gips - BA - S - PC = 2 : 1.5 : 4 : 1 : 1.5. Za obe mešavine, ispitivane su pritisna čvrstoća, minerološki sastav, apsorpcija vode i otpornost na niske temperature posle 7 i 28 dana, nakon pripremanja uzoraka (mešanja sa vodom). Dobijeni rezultati su pokazali da obe mešavine imaju potencijalnu mogućnost upotrebe za donje noseće slojeve kolovoznih konstrukcija puteva, pri čemu je druga mešavina (sa prirodnim agregatompeskom) u prednosti u odnosu na prvu mešavinu u pogledu pritisne čvrstoće, minerološkog sastava i otpornosti na tretman smrzavanje/odmrzavanje.
Abstract
This paper describes an investigation into the possibilities of the use of all three types of solid power plant wastes: fly ash (FA), flue gas desulphurization gypsum (FGD gypsum) and bottom ash (BA) as components of composites for road construction. Two mixtures were made: 1. power plant wastes - Portland cement (PC) and 2. power plant wastes - sand (S) - Portland cement (PC). The mass ratio of components in these mixtures was: 1. FA - FGD gypsum - BA - PC = 2 : 1.5 : 5 : 1.5 and 2. FA- FGD gypsum-BA - S - PC= 2 : 1.5 : 4 : 1 : 1.5. For both mixtures, the compressive strength, the mineralogical composition, the water absorption and the resistance to freeze-thaw treatment were determined 7 and 28 days after preparation of samples (mixing with water). The obtained results showed that both mixtures could have potential to be used for sub-base layers in road construction and the second mixture (with natural aggregate-sand) has advantage over the first mixture in terms of compressive strength, mineralogical composition, and resistance to freeze-thaw treatment.
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