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Room temperature Mössbauer spectrum of fly ash-recycled glass (FARG), prepared with more than 86 mass% of fly ash and less than 14 mass% of Fe2O3, comprises two types of doublets due to Fe(II) and Fe(III) of magnetite nanoparticles. Isothermal annealing of fly ash-recycled glass at 1100 °C for 60 minutes results in a precipitation of ferrimagnetic magnetite phase having an internal magnetic field of 46.4-48.2 T. When the Fe2O3 content is equal to or more than 14%, room temperature Mössbauer spectrum of FARG shows a magnetic hyperfine structure due to a magnetite phase, in addition to two doublets due to Fe(II) and Fe(III). An increase in the electric conductivity is observed from the order of 10-8 to 10-6 S . cm-1 after heat treatment at around the crystallization temperature. This can be ascribed to an improved step-by-step electron hopping from Fe(II) to Fe(III) of distorted FeO4 tetrahedra in the three-dimensional glass network.

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Waste compromises environmental preservation as well human health in many countries. Recycling is an alternative that sometimes represents the only economical activity for a significant population in the big cities. Almost 3% of waste materials in Brazil are vitreous. Ceramic production adding waste glass is possible with advantages of costs reduction associated to decrease on firing temperatures and to the raw material itself. At present paper up to 80 mass% of waste glass was added to clay. The sintering temperature decreased linearly and the shrinkage increased with glass content, an effect more pronounced for high glass amount.

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] Wright J. R. , Cartwright C. , Fura D. , Rajabipour F. ( 2014 ), Fresh and hardened properties of concrete incorporating recycled glass as 100% sand replacement . J. Mater. Civ. Eng. , 26 ( 10 ), DOI: 10.1061/(ASCE

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. 3. Ling , T-C , Poon , C-S 2011 Properties of architectural mortar prepared with recycled glass with different particle sizes . Mater Des 32 : 2675 – 2684 10.1016/j.matdes.2011

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be separated by colour once this level of mixing has occurred. For this reason, recycled glass often ends up in low value products, or else in a landfill [ 8 – 10 ]. The use of waste glass as a partial cement replacement is not new [ 11 , 12 ] and a

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