Research On The Comprehensive Performance Analysis And The Preferred Method Of Asphalt

Asphalt binder improper selection will lead directly to the asphalt pavement early disease, these diseases directly affect the durability and the safety performance of the asphalt pavement, so choose high-quality asphalt is the key to solve the problem of early diseases of asphalt pavement. China’s vast territory, complicated weather conditions, different levels of road traffic loading conditions also large differences, combined, on many brands of asphalt bitumen market, when in the face of a variety of all meet the standard requirements of the asphalt, optimum asphalt is more difficult. Therefore, the preferred method is based on quantitative research weather, traffic conditions and performance of asphalt has very important significance.Put forward the overall train of thought of the optimization method of asphalt, that is, through choosing asphalt preferred evaluation factors and evaluation elements of evaluation index, evaluation index score value and asphalt preferred evaluation factors weight determined to calculate the comprehensive index of the performance of asphalt. select the preferred evaluation factors is high temperature performance, low temperature performance, sense of heat resistance, anti-aging properties. The idea to use various climatic zoning in high temperature, low temperature, temperature difference, the influence of asphalt aging the relative importance of climate conditions, determine the weights of the corresponding asphalt preferred evaluation factors, and the heavy traffic conditions to optimize feature weights adjustment is proposed.For different types of asphalt temperature susceptibility, high temperature performance, low temperature performance, anti aging performance of comprehensive analysis and evaluation, we can draw the following conclusions.(1)recommended by proportional integral(PI) on temperature susceptibility of asphalt performance was evaluated.(2)the recommended softening point for the asphalt temperature performance evaluation.(3)The low temperature performance of the same low-temperature grade asphalt was distinguished by the low temperature TLC, and the low temperature ductility was recommended for the asphalt selection.(4) using the short-term aging residual ductility, residual penetration ratio as the preferred asphalt anti-aging performance evaluation index.With the help of GPC, DSC and FTIR, the microstructure of different asphalt is tested, and the aggregation state and molecular weight of asphalt can explain the properties of asphalt pavement. The mechanism of aging of asphalt was explained by FTIR spectra, and the anti ageing property of asphalt was distinguished from quantitative analysis.Combined with the statistical analysis of various asphalt technology index data. The 70#, 90# matrix asphalt, SBS I-C modified asphalt score were established, and the indexes of 70#, 90# matrix asphalt and SBS I-C modified asphalt were set up. The classification of the climatic conditions of the climatic conditions of high temperature, low temperature, temperature difference and the influence of asphalt aging are divided. The weight of asphalt temperature, low temperature, temperature and anti- aging properties of asphalt was determined by the comparison matrix of the analytic hierarchy process. In addition, the weight of the road under heavy traffic conditions is adjusted appropriately. Through the comprehensive performance index of asphalt, the composite index of asphalt 70#, 90# matrix asphalt and SBS I-C modified asphalt was calculated. Using the ranking results of the comprehensive performance index, it is recommended for the partial climatic zoning of the asphalt with the outstanding performance of the comprehensive properties.