Towards Imaging-based Quantification of Deterioration Using Colour Space Study

This work presents an approach for imaging-based measurement of structure deterioration for M30 grade concrete. The samples are subjected to a variety of concrete deterioration chemicals including 5% concentrated solutions of H2SO4, HCl, NaCl, and MgSO4 for 3, 7, 14, and 28 days, respectively. Red, Green, and Blue (RGB) colour space is not advisable for colour-based detection or colour analysis because of the mixing of colour and intensity information as well as non-uniform features. Hue, Saturation, and Value (HSV) colour space can quantify the surface colour detection of deterioration by the various chemical agents with respect to the duration of the attack. The surface colour change of the concrete cube specimen can be identified with respect to the duration of the attack and the type of chemical involved; meanwhile, it gives the residual strength of the specimen. This method enables the construction of a visual spectrum-based quantification tool for the degree and duration of deterioration by establishing empirical equations.