✐ ✐ ✐ ✐ ✐ ✐ ✐ ✐ BULETINUL INSTITUTULUI POLITEHNIC DIN IAS ¸I Publicat de Universitatea Tehnic˘ a ,,Gheorghe Asachi” din Ias ¸i Tomul LIV (LVIII), Fasc. 4, 2008 Sectia CONSTRUCT ¸ II. ARHITECTUR ˘ A ABOUT COLOURED COLD ASPHALTIC MIXTURES BY LOREDANA JUDELE Abstract. The first coloured bitumen was obtained by using bitumen from Peru and then bitumen from the Middle East, with a low content of asphaltenes, also called ”colourable” bitumens. The colours obtained by adding iron oxides led nevertheless to dark colours, due to the presence of asphaltenes. Nowadays the coloured asphalt is obtained from synthesis binders with translucent aspect. The colours are obtained by adding inorganic pigments, mainly iron oxide for red, chromic oxide for green, titanic dioxide for white. The properties and behaviour of the coloured bitumen during its lifetime are comparable with the ones of classic bitumen, sometimes even better. Key Words: Coloured Bitumen; Asphaltic Mixture; Slurry-Seal. 1. Introduction Almost all the technologies for the application of the classic bitumen may be used for the synthetic binder, provided perfect cleanliness of the processing gears, transportation equipment and equipment for the performance of the works in order to avoid the deterioration of colours through the contamination with traces of black bitumen. Fig. 1. – Coloured asphalt laying. The peculiar properties of the coloured asphaltic coatings offer special advantages in comparison to the classic ones namely