Notes About Bf Sludge as a Potential Use as Filler in Asphalt Mixture Composition

Abstract The purpose of the research carried out is to develop a new perspective on a material resulting from steelworks. Currently, the blast furnace sludge from Galati is used as granular material in road construction generally at foundation layer. The bf sludge has the chemical and mechanical potential to be used as filler in bituminous mixture, as a result of its particular composition which does not interact with bitumen, and it has the ability to be crushed in particle fractions. The main constituents of the bf sludge are different oxides, as calcium, aluminium, iron, magnesium, manganese oxides, sulphide. The raw material is homogenous, with no impurities and it is not toxic for the environment. The characteristics of the filler sample was analysed, and its results is compared with standard specifications. The bf sludge was ground into very fine granules, under 2 mm, and then tested in laboratory in standard conditions.