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Lecomte A.,CNRS Jean Lamour Institute | Diliberto C.,CNRS Jean Lamour Institute | Dao P.-L.,CNRS Jean Lamour Institute | Sommier M.,Societe SLAG | Basso P.,Societe SLAG
MATEC Web of Conferences | Year: 2012

BOF Slags are residues of the transformation of melting steel. These abundant products (more than 2 million tonnes per year in France) are little valued in civil engineering because they contain free lime which, by hydrating, cause often substantial expansions. A tool for use in road granular mixtures has been developed. It is based on two parametric models describing; i) the rate of grain degraded in water at temperature and age given, in function of the content of free lime, the size and the structure of the grain, ii) the expansion of the packing granular, pure or mixed with inert aggregates, exposed to a flow of steam. The combination of these two models with the Compressible Packing Model of LCPC allows then the prediction of the kinetics of expansion of a granular mixture, and the designation of mixtures optimized in terms of granularity and proportions, incorporating BOF Slag, for a use specified by an expansion to a given deadline and in a given environment. © 2012 Owned by the authors, published by EDP Sciences. Source


Lecomte A.,CNRS Jean Lamour Institute | Dao P.L.,CNRS Jean Lamour Institute | Diliberto C.,CNRS Jean Lamour Institute | Sommier M.,Societe SLAG | Basso P.,Societe SLAG
European Journal of Environmental and Civil Engineering | Year: 2012

This article in three parts deals with the degradation of Basic Oxygen Furnace Slag (BOF Slag) in wet media and associated expansion of granular mixtures containing these materials. The part 1 proposed a model of degradation based on the quantification of the damages observed in time by different BOF Slag placed in aqueous media with various temperatures. The part 2 concerned the measurement of steam expansion realized on the same products, in the CBR mould adapted to the expansive test. The data allowed characterizing the obtained hyperbolic curve, according to the granular packing density and of a "free equivalent lime content". The present article uses the results of the both previous models to consider the expansion of every granular mixture. Then, this set can be used to formulate granular mixtures of controlled expansion and help to the valorization of the BOF Slag in road. Source


Lecomte A.,CNRS Jean Lamour Institute | Dao P.L.,CNRS Jean Lamour Institute | Diliberto C.,CNRS Jean Lamour Institute | Sommier M.,Societe SLAG | Basso P.,Societe SLAG
European Journal of Environmental and Civil Engineering | Year: 2011

This article in three parts deals with the degradation of Basic Oxygen Furnace Slag (BOF Slag) in wet media and associated expansion of granular mixtures containing these materials. The present text (part 1) proposes a model of degradation based on the quantification of the damages observed in the time by different BOF Slag placed in aqueous environment with various temperatures. It allows estimating a rate of degradation at a given age, either an age for which a rate of degradation will be reached, from the average content in free lime of the products and the surrounding temperature. The second article concerns the measurement of steam expansion realized on the same products, in the mould CBR adapted to the expansive test. The third part uses the results of the both previous models to consider the expansion of every granular mixture. This set can then serve to formulate granular mixtures of controlled expansion and help to the valorization of the BOF Slag in road. © 2011 Lavoisier, Paris. Source


Lecomte A.,CNRS Jean Lamour Institute | Dao P.L.,CNRS Jean Lamour Institute | Diliberto C.,CNRS Jean Lamour Institute | Sommier M.,Societe SLAG | Basso P.,Societe SLAG
European Journal of Environmental and Civil Engineering | Year: 2011

This article in three parts deals with the degradation of Basic Oxygen Furnace Slag (BOF Slag) in wet media and associated expansion of granular mixtures containing these materials. The part 1 proposed a model of degradation based on the quantification of the damages observed in time by different BOF Slag placed in aqueous media with various temperatures. The present article concerns the measurement of steam expansion realized on the same products, in the CBR mould adapted to the expansive test. The data allowed characterizing the obtained hyperbolic curve, according to the granular packing density and of a "free equivalent lime content" which depends on the age and on the size of grains. The third part uses the results of the both previous models to consider the expansion of every granular mixture. Then, this set can be used to formulate granular mixtures of controlled expansion and help to the valorization of the BOF Slag in road. © 2011 Lavoisier, Paris. Source

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