Composition optimization of waste cooking oil recycled asphalt and performance research of its mixture

Abstract

Abstract: To improve the pavement performance of recycled asphalt mixtures， the preparation schemes of recycled asphalt were designed by using a response surface method with the contents of waste cooking oil and styrene-butadiene-styrene （SBS）-modified asphalt， and the shear temperature as independent variables. The influence of these independent variables on the properties of regenerated asphalt were analyzed through basic physical and rheological measurements to determine the optimization scheme of recycled asphalt. On this basis， the pavement performance was verified. The results indicated that the optimal optimization scheme for recycled asphalt was determined to be a content of waste cooking oil of 8.4 wt%， a content of SBS-modified asphalt of 152 wt%， and a shear temperature of 166 ℃. The maximum error between the predicted values and actual results of performance indicators of recycled asphalt was 4.5 %， which was within the acceptable limits. With an increase in the content of the reclaimed asphalt pavement （RAP）， the cracking resistance and water stability of recycled asphalt mixtures decreased but their high-temperature stability was improved. Compared to the recycled asphalt mixtures without waste cooking oil， the recycled asphalt mixtures containing waste cooking oil showed a significant improvement in the low-temperature crack resistance and water stability.

Key words: road engineering, response surface method, recycled asphalt, waste cooking oil, road performance

References

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