Impact of hardening conditions on to stabilized/solidified products of cement-sewage sludge-jarosite/alunite

Cheilas, A; Katsioti, M; Georgiades, A; Malliou, O; Teas, C; Haniotakis, E

dc.contributor.author	Cheilas, A	en
dc.contributor.author	Katsioti, M	en
dc.contributor.author	Georgiades, A	en
dc.contributor.author	Malliou, O	en
dc.contributor.author	Teas, C	en
dc.contributor.author	Haniotakis, E	en
dc.date.accessioned	2014-03-01T01:26:27Z
dc.date.available	2014-03-01T01:26:27Z
dc.date.issued	2007	en
dc.identifier.issn	0958-9465	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/18083
dc.subject	Autoclave	en
dc.subject	Cement	en
dc.subject	Heavy metals	en
dc.subject	Jarosite/alunite	en
dc.subject	Sewage sludge	en
dc.subject	Stabilization/solidification	en
dc.subject.classification	Construction & Building Technology	en
dc.subject.classification	Materials Science, Composites	en
dc.subject.other	Cements	en
dc.subject.other	Mixtures	en
dc.subject.other	Precipitation (chemical)	en
dc.subject.other	Waste disposal	en
dc.subject.other	Wastewater treatment	en
dc.subject.other	Water treatment plants	en
dc.subject.other	Autoclave	en
dc.subject.other	Jarosite/alunite	en
dc.subject.other	Toxicity characteristics leaching procedure (TCLP)	en
dc.subject.other	Sewage sludge	en
dc.title	Impact of hardening conditions on to stabilized/solidified products of cement-sewage sludge-jarosite/alunite	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.cemconcomp.2006.12.005	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.cemconcomp.2006.12.005	en
heal.language	English	en
heal.publicationDate	2007	en
heal.abstract	The main objective of this work is to investigate a viable alternative for the final disposal of sewage sludge from urban wastewater treatment plants using a mixture with cement and jarosite/alunite (J/A) precipitate to develop new construction materials. J/A precipitate is a waste product of a new hydrometallurgical process, which was developed in order to treat economically low-grade nickel oxide ores. In the current study two methods were used for the hardening of the stabilized/solidified products: (1) in laboratory conditions and (2) in accelerated conditions (autoclave treatment). For this purpose, mortar prism samples of 4 x 4 x 16 cm in dimension were prepared, composed of 50% sewage sludge, 30% cement and 20% jarosite/alunite. The samples were treated in an autoclave for 3 h at a temperature of 200 degrees C and a pressure of 16 bar as well as in laboratory conditions for 28 and 90 days. Compressive and bending strength, while chemical, XRD, thermal analysis, as well as tests of leaching, were tested according to the standard/principal methods of toxicity characteristics leaching procedure (TCLP) and CEN/TS 14405. The results indicated that stabilized/solidified products can be produced for use in construction and that the heavy metals of sludge can be contained in the cement and jarosite/alunite mixture. (c) 2007 Elsevier Ltd. All rights reserved.	en
heal.publisher	ELSEVIER SCI LTD	en
heal.journalName	Cement and Concrete Composites	en
dc.identifier.doi	10.1016/j.cemconcomp.2006.12.005	en
dc.identifier.isi	ISI:000245841800002	en
dc.identifier.volume	29	en
dc.identifier.issue	4	en
dc.identifier.spage	263	en
dc.identifier.epage	269	en