Study Of Rheological Performance Of SBS Modified Asphlt Made By Different Block Proportion

With the rise on the highway of traffic, the raising of vehicle speed, the growth of wheel load, the increase of overloading and channelized traffic, a higher demand is presented for asphalt pavement just as safety, comfortable, durability and so on, and these demands must rely on pavement performance of asphalt. Most kinds of crude oil are waxy, with high wax content, low aromatic rates content and low Asphaltene content, and base asphalt made in our country can't meet asphalt pavement construction demands, so additives for asphalt and asphalt mixture get more and more research to improve those performance. It is an important task for road researcher to enhance asphalt pavement performance, extend pavement life and increase investment benefit.This paper researches the influence of experiment data with temperature for different parallel plates through dynamic frequency sweep testing by dynamic shear rheometer. This experiment is made in the definite temperature scope and different parallel plates. Choosing parallel plates criteria is confirmed by fitting frequency modulus master curve and calculate benchmark temperature values through WLF equaliton.On the basis of choosing criteria for instrument parallel plates, this paper adopts SBS polymer modifiers of different block proportion S/B values to prepare special kind SBS modified asphalts, and then analyses functions of S segment and B segment in SBS modified asphalt and draws these conclusions. Low speed area can get better pavement performance through SBS modified asphalt made by low S/B value and high speed area can get it by high S/B value. Research the influence of complex modulus, phase angles and viscous ity of modified asphalt by different block proportion S/B values.According to making modified asphalt in laboratory, SBS modified asphalts of high and low block proportion S/B are made in works namely high modulus modified asphalt and high elastic modified asphalt, and they both are apply patents. And then rheometer parameters getting by fitting SBS modified asphalt based on CAM model analysis the effect of modifiers for base asphalt temperature susceptibility by different block proportion S/B. Obtaining ZSV under different loading modes with rheology explains relativity of fitting values by different rheology models, and evaluates Zero Shear Value for modified asphalt.Analyses Burgers rheology model and research rationality and limitation of Gv value fitting based on repeated creep test, and then bring forward Gv(t) value to appraise asphalt's performance by improving Burgers rheology model. Gv(t) value as a new index includes delay elastic and it can describe relationship of stress and strain roundly for modified asphalt. Adopting cumulative dissipated energy ratio appraise fatigue behavior of modified asphalt by different block proportion S/B. Considering engineering practical application, engineering indexes are put forward to check modified asphalt's performance behavior easily.Comparing practical engineering applying effects with high modulus modified asphalt, high elastic modified asphalt and common SBS modified asphalt. These includes indoor experiment and test road pavement, and it proves that choosing SBS modified asphalts of different S/B values for different kinds asphalt pavement can get better effece.This paper researches SBS modifiers of different S/B values, and appraises modified effect based on indoor experiment and engineering verify, and provides criteria for practical application.