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Semi-blowing of vacuum residues has been a widely used technology for production of bituminous binders for a long time. The semi-blowing process is oxidation by air at elevated temperatures and the properties of products are affected by the reaction conditions as well as the composition of feedstock. The feedstocks for semi-blowing are vacuum residues from crude oil distillation in most cases. However, materials of different origin can be added to vacuum residues as a component of feedstock. There are efforts to use different waste materials in bitumen industry, i.e. waste engine oils, waste cooking oils or bio-oils from biomass pyrolysis. The influence of the reaction conditions and used cooking oil addition on the properties of semi-blown bitumen were investigated. The semi-blowing process was simulated at a pilot batch unit and the products were analysed by standard methods for bitumen evaluation, rheological tests and thermal ageing.