Abstract

Pervious concrete pavement test sections employing coloured permeable concrete were constructed as an experimental bicycle lane. For two of the sections, coloured concrete was used with pigment addition consisting of Fe2O3 (red) and Cr2O2 (green). The impacts on the resistance and stiffness of the concretes when using these pigments were analysed in relation to the reference concrete (grey). Alterations in plasticiser dosage during mixing were readily observed with the red concrete. The flexural strength increased substantially in the case of the red coloured concrete, as well as the modulus of elasticity of the material. Initial infiltration rates decreased with the use of coloured pigments, especially for red concrete, with expressive drops in permeability. Simultaneously, the resistance to friction given by the British Pendulum Number was reduced due to the use of red or green pigments. The consequences of using red pigment with a very high grains specific surface are discussed, since they are advantageous in the case of mechanical responses eventually inferior in terms of hydraulic and functional aspects.