AG-PT-T103_RTFO前处理和损失的沥青,多级和聚合物改性沥青加热(压延薄膜烘箱)(蒸发损失).pdfVIP

AG:PT/T103 Pre-treatment and loss on heating of bitumen, multigrade and polymer modified binders (rolling thin film oven (RTFO) test) COMMENTARY TO AG:PT/T103 - PRE-TREATMENT AND LOSS ON HEATING OF BITUMEN, MULTIGRADE AND POLYMER MODIFIED BINDERS (ROLLING THIN FILM OVEN (RTFO) TEST) PREFACE This modified binder test method was prepared by the Bituminous Surfacing Research Reference Group on behalf of Austroads. Representatives of Austroads Member Authorities, ARRB Group and Industry through the Australian Asphalt Pavement Association have been involved in the development and review of this method. FOREWORD Polymer Modified Binders (PMBs) and Multigrade binders can undergo significant changes in characteristics during the process of asphalt manufacture, transport and laying. The test specified in AS/NZS 2341.10, Method 10: Determination of the effect of heat and air on a moving film of bitumen (rolling thin film oven (RTFO) test), simulates the effect of the hot mixed asphalt manufacturing process on asphalt grade binders manufactured to the Standards Australia Specification AS2008. The oxidative effects at mixing temperatures (typically in the range 150°C to 170°C) on the thin binder films that occur during asphalt manufacture, transportation and placement are simulated by the RTFO test conducted at an oven temperature of 163°C over a period of 85 minutes. Unfortunately, even at this elevated temperature, the potentially complex flow characteristics of some binders can reduce the effectiveness of the test. This occurs primarily because the flow of the binder in the RTFO bottle relies on the action of gravity as the bottle rotates, in contrast with the high shear coating of the aggregate in the pugmill where the thin binder films are quickly formed. Where flow pr