科研之友
微信
新浪微博
Facebook
分享链接
摘要
This paper presents an alternative method for developing a laboratory short-term ageing procedure for binders that corresponds to the asphalt mixture production practices carried out in a tropical region. In this method, the ASTM D2872 procedure was adapted to artificially short-term age asphalt binders, while ageing time and ageing temperature were evaluated. A statistical technique named response surface method (RSM) was used for the design of experiment, analysis of the test results from the field and laboratory samples, and selection of an appropriate laboratory protocol. An experimental matrix was designed based on the central composite method for two basic independent laboratory factors: ageing times in a range of 85-175 min, and ageing temperatures within 148-178 degrees C. Several test variables, include softening point, penetration, G*/sin delta at 64 degrees C and rotational viscosity at 135 degrees C of three conventional binders were considered as dependent test factors (responses). The responses were analyzed using RSM to derive mathematical equations, while the corresponding time and temperature were determined from optimization of the test results. The outcome of this study indicated that the conventional short-term ageing protocol in accordance with the ASTM D2872 may not be sufficient to simulate the short-term ageing of. asphalt binders in the Malaysian weather condition, where high daily temperatures, humidity, and ultraviolet are concerned. Based on the statistical analyses, both time and temperature have significantly affect the physical and rheological properties of short-term aged binders. Overall, all three binders show quadratic models for the resulting responses with the exception of two binders which show 2FI and linear models for its physical properties. The resulting optimization recommends a short-term ageing procedure at 170 degrees C for 135 min to appropriately mimic the field binder properties under Malaysian climate.
- 出版日期2018-2-10
