Study On The Performance And The Application Of Asphalt Mixture Modified By Warm Mix And Anti-rutting Additive

In the 21st century, environmental pollution and energy crisis have become a global consensus. On the APEC meeting held in November 2014, China and the US issued a joint statement, and the Chinese government promised that China’s carbon emissions will peak in 2030. It’s imperative to realize the energy efficiency and emission reduction target, and "green and low-carbon" has become a common theme in various industries. At the same time, with the volume of traffic and the phenomenon of traffic channelization and overloading getting worse, asphalt pavement appears various distresses in early days, such as crack, deformation, water damage, and so on. Among these distresses, rutting has a profound effect, which threaten the traffic safety, and shorten the life of the road. In the new era, it has become a long-cherished wish for road researchers to construct roads with good performance, especially with excellent anti-rutting performance, based on low energy consumption and low environmental pollution.This paper relies on Suzhou Topoline Technologies Co., Ltd. science and technology project-’study on the application of SG warm mix and anti-rutting additive’, and attempts to combine the technology of warm mix asphalt mixture and the technology of anti-rutting agent. In this paper, a series of laboratory experiments will be conducted, and we will carry out researches from three aspects. Firstly, the conventional asphalt index tests, dynamic shear rheological (DSR) tests and bending beam rheometer (BBR) tests are carried out to study the performance of the modified asphalt, and evaluate its effect of the modification. Besides, two methods based on equiviscous temperature principle and equivolumetric principle are carried out to find out the reasonable way to determine the mixing and compaction temperature of asphalt mixture modified by SG warm mix and anti-rutting additive. Secondly, four kinds of asphalt mixture composed of different type gradation (SMA-13, AC-13, AC-20, SUP-20) are selected to study the road performance of modified asphalt mixture, including high and low temperature stability, water stability, fatigue performance, and so on. We will evaluate the effect of the modification on asphalt mixture by comparing the performance of base asphalt mixture and modified asphalt mixture. What’s more, this paper will predict and analyze the rut of asphalt pavement modified by SG. We will establish typical pavement structures by using ABAQUS finite element software, and calculate the ruts of asphalt pavements which are mixed with different dosages of additive based on the improved Theta-4 model. And, it will provide theoretical guidance for the engineering application of SG warm mix and anti-rutting additive. The results show that:the SG-A component can improve the high temperature deformation resistance and thermal aging resistance of asphalt, but it has a negative impace on the low temperature performance. Besides, under the influence of SG two conponents, the high temperature stability, low temperature crack resistance, water stability of asphalt mixture all have varying degrees of increase, and the fatigue performance tests based on the constant strain reflect the fatigue life of the modified asphalt mixture has fallen. What’s more, the modifier applied research base on the rut forecast gives the sensitivity of the modifier dosage of different layers in different pavement structures, and gives the corresponding modification agent added according to different traffic flow.Through the researches of this paper, we will have a comprehensive knowledge of the effect of the modification of warm mix and anti-rutting additive. Meanwhile, I hope it can provide guidance for the future engineering application through a series of ordered experimental investigation and theoretical study in this paper, and contribute to the development of warm mix and anti-rutting additive.