Statistical Optimization of Bitumen Modification Process by Oil-Based Waste Paint

Abstract

In an ancient time of sustainable construction where reuse and recycling of construction materials are highly encouraged, researchers have sought new ways of creating values for materials that would else constitute an environmental nuisance. In this study, the use of oil-based waste paints known for their high alkyd resin content in bitumen blends will be investigated Varying proportions of the waste paints were added to pen-grade 60/70 bitumen by; weight. Characterization of the alkyd resin by using fourier transform infrared spectroscopy (FTIR) and some phsico-chemical properties like acid value (14.025mgKOH/g), saponification value (187.179mgKOH/g), kinematic viscosity (3.4*10-2m 2 /s), color (dark-brawn), and specific gravity (1.12g/cm3 ) of the alkyd resin was alone. The investigated physio-chemical properties and functional groups of the alkyd resin were in good agreement with a standard one. The effects of the alkyd resin on the engineering properties of the bitumen were tested for viscosity, penetration, softening point fire and flash point, and loss on heating, using standard test procedures. The effects of three process parameters (blending temperature, blending time, and blending concentration) on the quality of bituminous ductility were investigated. Response surface methodology with a central composite design was used for the optimization of quality of bituminous ductility and process parameters. Based on the analysis, the optimum blending conditions were found to be blending temperature of 160oC, blending time of 60min, and blending ratio of 5%. Under these conditions, the maximum bituminous ductility quality obtained was 240 cm. The experimental quality of bituminous ductility (210cm) is in smooth agreement with the predicted one (240 cm), showing the suitability of the quadratic model used. The findings of the study show that the optimum percentage of the additive ratio to give the best combination of performance and phsio-chemical properties were determined by the weight of bitumen. At the determined percentage, a significant decrease in low-temperature cracking and high-temperature rutting was respected. Generally, the findings of the study suggest that utilization of oil-based waste paint as a potential alkyd resin production for bituminous modification is worthful