title: Recycling the product of thermal transformation of cement-asbestos for the preparation of calcium sulfoaluminate clinker.
abstract: According to recent resolutions of the European Parliament (2012/2065(INI)), the need for environmentally friendly alternative solutions to landfill disposal of hazardous wastes, such as asbestos-containing materials, prompts their recycling as secondary raw materials (end of waste concept). In this respect, for the first time, we report the recycling of the high temperature product of cement-asbestos, in the formulation of calcium sulfoaluminate cement clinkers (novel cementitious binders designed to reduce CO₂ emissions), as a continuation of a previous work on their systematic characterization. Up to 29 wt% of the secondary raw material was successfully introduced into the raw mix. Different clinker samples were obtained at 1250 °C and 1300 °C, reproducing the phase composition of industrial analogues. As an alternative source of Ca and Si, this secondary raw material allows for a reduction of the CO₂ emissions in cement production, mitigating the ecological impact of cement manufacturing, and reducing the need for natural resources.
authors.affiliation: Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Modena e Reggio Emilia, Via S. Eufemia 19, I-41121 Modena, Italy. alberto.viani@hotmail.com
authors.forename: Alberto
authors.initials: A
authors.lastname: Viani
authors.forename: Alessandro F
authors.initials: AF
authors.lastname: Gualtieri
mesh_terms: D017607:Aluminum Compounds / Q000737:chemistry*; D001194:Asbestos / Q000737:chemistry*; D017610:Calcium Compounds / Q000737:chemistry*; D002245:Carbon Dioxide / Q000737:chemistry; D003247:Conservation of Natural Resources; D003252:Construction Materials; D006256:Hazardous Waste; D006358:Hot Temperature; D007221:Industry; D008855:Microscopy, Electron, Scanning; D059027:Recycling; D012037:Refuse Disposal; D017640:Silicates / Q000737:chemistry; D013457:Sulfur Compounds / Q000737:chemistry*; D013696:Temperature
chemical_list: D017607:Aluminum Compounds; D017610:Calcium Compounds; D006256:Hazardous Waste; D017640:Silicates; D013457:Sulfur Compounds; C529583:calcium sulfoaluminate; C013481:dicalcium silicate; D001194:Asbestos; D002245:Carbon Dioxide
keywords: Amorphous; Cement-asbestos; Recycling; Rietveld method; Sulfoaluminate