Design Of Key Parameters And Study On The Performance Of Bituminous Mixtures Mixed With Anti-rutting Additive

The total length of Chinese highway construction is increasing year by year, which greatly promot the development of economic and society. However, the phenomena of highway diseases are serious and rut is one of the major diseases. This paper describes the formation mechanism of rutting disease and preventive measures, proposes the application of anti-rutting additive, analyses the mechanism of anti-rutting additive. The LUNENG anti-rutting additive is a new type of polymer modified agent for modified asphalt mixture.In this paper, the main content focus on the design method on the asphalt mixture mixed with LUNENG anti-rutting additive and the effects of performance improvement after adding LUNENG anti-rutting additive. Firstly, by groups of the laboratory test data and mathematical calculation, the key design parameters such as the best mixing temperature, the dry mixing time and a reasonable dosage range of this anti-rutting additive were determined. A reasonable mixture preparation process was obtained.Secondly, the AC-16 asphalt mixtures with various doses of anti-rutting additive were tested, including high temperature stability, low temperature crack resistance and water stability. The conclusion was that anti-rutting additive can significantly improve the asphalt mixture's dynamic stability, while improving the performance of low temperature crack resistance and water stability.Thirdly, in consideration of the total permanent deformation in the whole rolling process, the use of dynamic compressive strength as the aided evaluation of high temperature performance of mixture is very reasonable and necessary.Fourthly, the performance of asphalt mixtrures with anti-rutting additive can be compared in the following three gradations (coarse type, fine type, mid-value).And the coarse type gradation is more sensitivity.Fifthly, road performance of asphalt mixtrures with different asphalt binders and anti-rutting performance in higher temperature were tested. The superiority of the modified way of adding anti-rutting additive was fully reflected in improving the high temperature stability. The asphalt mixture modified by LUNENG anti-rutting additive can take the place of SBS modified asphalt mixtureFinally, the anti-rutting experiments of asphalt mixture were done to simulate the harsh environment in high temperature as well as water.And relevant conclusions were drawn.