title: Crystal chemistry of the high temperature product of transformation of cement-asbestos.
abstract: In this work, the high-temperature inertization product of a representative batch of samples of cement-asbestos (CA) from different localities in Italy have been characterized with a multidisciplinary approach. All the raw CA samples were heated at 1200°C for 15 min. After firing, they underwent a series of solid state reactions leading to global structural changes of the matrix. Effects of annealing time and temperature on the crystallization kinetics were thoroughly investigated. Both factors acted in favour of equilibrium. Three classes of CA were identified with the aid of phase diagrams and of specific plots relating chemical and mineralogical parameters. This result was considered of importance in view of the potential use of transformed cement-asbestos as a secondary raw material. In principle, the content of CA packages removed from the environment and their corresponding heat-treated products can be classified simply using XRF. This method allows for the selection of appropriate fractions in function of the most suitable recycling solution adopted. Samples belonging to the class called larnite-rich, turned out to be of great interest as possible candidate for substituting a fraction of cement in many building materials and innovative green cement productions.
authors: Dipartimento di Scienze della Terra, Università di Modena e Reggio Emilia, Via S. Eufemia 19, I-41121 Modena, Italy.
authors: Alberto
authors: A
authors: Viani
authors: Alessandro F
authors: AF
authors: Gualtieri
authors: Simone
authors: S
authors: Pollastri
authors: Caterina
authors: C
authors: Rinaudo
authors: Alessandro
authors: A
authors: Croce
authors: Giancarlo
authors: G
authors: Urso
mesh_terms: D001194:Asbestos / Q000737:chemistry*; D003252:Construction Materials; D003460:Crystallization; D006358:Hot Temperature; D008855:Microscopy, Electron, Scanning; D033362:Powder Diffraction; D013052:Spectrometry, X-Ray Emission; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman; D018505:Waste Management / Q000379:methods*; D014961:X-Ray Diffraction
chemical_list: D001194:Asbestos