The use of the metallurgical slags in substitution of the natural aggregates, is a consolidated reality in the field of the road constructions, by now from several years. Numerous international studies can document the positive performances of the mixtures realized with such marginal material, in particular for what concerns the Blastfurnace slag (BF) and the Basic Oxygen Steel slag (BOS), that are widely used in various European and extra-European countries, while is still subject of research the evaluation of the potential of the Electric Arc Furnace Steel slag (EAFS), that vice versa are finding a greater success in Italy. Due to the increasing interest for such particular typology, the Authors presents a theoretical-experimental study on the composition, performance and mechanical characteristics, of both traditional and high performances bituminous mixtures (porous asphalt and stone mastic asphalt) made with EAFS slag, for road flexible pavements. The experimental trial has been articulated in a preliminary study of the physical-geotechnical properties of the EAF steel slag by itself, and in a mechanical characterization of the bituminous concretes, in terms of Marshall tests and Indirect Tensile Strength test, while the performance behaviour of the mixtures has been investigated with stiffness modulus tests (ITSM) at various temperatures and with permanent deformations tests (static Creep and Repeated Load Axial Test). Focusing attention on rutting phenomena, and with the aim of evaluating the performance behaviour of mixes studied in the laboratory in service conditions, the work has been completed with FEM analysis of the deformations induced by traffic loads, using a specifically developed visco-elasto-plastic law as a constitutive model for the bituminous layers.
The use of EAF steel slag in the bituminous mixtures for flexible pavements: a numerical and experimental analysis
PASETTO, MARCO;
2007
Abstract
The use of the metallurgical slags in substitution of the natural aggregates, is a consolidated reality in the field of the road constructions, by now from several years. Numerous international studies can document the positive performances of the mixtures realized with such marginal material, in particular for what concerns the Blastfurnace slag (BF) and the Basic Oxygen Steel slag (BOS), that are widely used in various European and extra-European countries, while is still subject of research the evaluation of the potential of the Electric Arc Furnace Steel slag (EAFS), that vice versa are finding a greater success in Italy. Due to the increasing interest for such particular typology, the Authors presents a theoretical-experimental study on the composition, performance and mechanical characteristics, of both traditional and high performances bituminous mixtures (porous asphalt and stone mastic asphalt) made with EAFS slag, for road flexible pavements. The experimental trial has been articulated in a preliminary study of the physical-geotechnical properties of the EAF steel slag by itself, and in a mechanical characterization of the bituminous concretes, in terms of Marshall tests and Indirect Tensile Strength test, while the performance behaviour of the mixtures has been investigated with stiffness modulus tests (ITSM) at various temperatures and with permanent deformations tests (static Creep and Repeated Load Axial Test). Focusing attention on rutting phenomena, and with the aim of evaluating the performance behaviour of mixes studied in the laboratory in service conditions, the work has been completed with FEM analysis of the deformations induced by traffic loads, using a specifically developed visco-elasto-plastic law as a constitutive model for the bituminous layers.
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