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Composition design and crack resistance evaluation of asphalt rubber stress absorbing film interlayer (ar-sami)

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Document pages: 11 pages

Abstract: In order to promote the application of asphalt rubber stress absorbing film interlayer (ar-sami), it is necessary to study the material composition design and anti reflective crack effect evaluation of ar-sami. In this paper, the high and low temperature properties, elastic recovery and fatigue resistance of sk90# original asphalt, asphalt rubber and SBS modified asphalt were evaluated by conventional asphalt test, dynamic shear rheometer (DSR) test and fatigue cracking test. A material composition design method of ar-sami based on interlaminar shear strength is proposed. The effects of asphalt content and aggregate content on interlaminar shear strength are also discussed to determine the best material composition. Fatigue Cacking test was designed based on the Hamburg rutting instrument, and the cracking resistance of AR-SAMI was analyzed. The results indicate that asphalt rubber is the suitable binder for SAMI. The application rates of asphalt and aggregate have significant impact on the interlaminar shear strength of AR-SAMI. The optimum binder application rate of asphalt rubber and aggregate application rate are 2.2 kg m2 and 14 kg m2, respectively, for AR-SAMI. The fatigue cracking life and fatigue fracture life of composite specimens increase obviously after AR-SAMI is paved. The increasing range of fatigue life because of the use of AR-SAMI is up to 30 under the dry condition of 15°C. The decreasing range of fatigue life caused by water reaches as high as 50 . The fatigue life falls sharply when the temperature increases from 15°C–25°C to 35°C–45°C.

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