PURPOSES : The objective of this study is to investigate the properties of recycled asphalt binders with five different rejuvenators, in order to evaluate the applicability of the recycled asphalt binders compared with the original asphalt binder. METHODS : In order to simulate recycled asphalt bind...
PURPOSES : The objective of this study is to investigate the properties of recycled asphalt binders with five different rejuvenators, in order to evaluate the applicability of the recycled asphalt binders compared with the original asphalt binder. METHODS : In order to simulate recycled asphalt binders, fresh asphalt binders are aged by various Superpave aging procedures, such as the rolling thin-film oven (RTFO) and the pressure aging vessel (PAV). Then, selected rejuvenators are added to the aged asphalt binders in the amount of 5%, 10%, and 15%. The asphalt binder properties are evaluated by the dynamic shear rheometer (DSR), the rotational viscometer (RV), and the bending beam rheometer (BBR). In this study, AP-5 (penetration grade 60-80, PG 64-16) asphalt binder is used. A total of five types of rejuvenators are employed. RESULTS AND CONCLUSIONS : When considering aged asphalt without a new asphalt binder, it seems that the percentage of rejuvenator used in Korea is a bit too low, and that it fails to possess the characteristics of the original binder. From the current practice of evaluating the properties of recycled binder based on penetration ratio only, the amount of rejuvenator required is similar for the long-term-aged binder, but is excessive for the longest-term aged binder, causing deterioration of workability and stiffness of the recycled binder.
PURPOSES : The objective of this study is to investigate the properties of recycled asphalt binders with five different rejuvenators, in order to evaluate the applicability of the recycled asphalt binders compared with the original asphalt binder. METHODS : In order to simulate recycled asphalt binders, fresh asphalt binders are aged by various Superpave aging procedures, such as the rolling thin-film oven (RTFO) and the pressure aging vessel (PAV). Then, selected rejuvenators are added to the aged asphalt binders in the amount of 5%, 10%, and 15%. The asphalt binder properties are evaluated by the dynamic shear rheometer (DSR), the rotational viscometer (RV), and the bending beam rheometer (BBR). In this study, AP-5 (penetration grade 60-80, PG 64-16) asphalt binder is used. A total of five types of rejuvenators are employed. RESULTS AND CONCLUSIONS : When considering aged asphalt without a new asphalt binder, it seems that the percentage of rejuvenator used in Korea is a bit too low, and that it fails to possess the characteristics of the original binder. From the current practice of evaluating the properties of recycled binder based on penetration ratio only, the amount of rejuvenator required is similar for the long-term-aged binder, but is excessive for the longest-term aged binder, causing deterioration of workability and stiffness of the recycled binder.
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문제 정의
The objective of this study is to investigate the properties of recycled asphalt binders with five different rejuvenators in order to evaluate the recycled asphalt binders’applicability comparing with the original asphalt binder.
가설 설정
1. Change of properties of aged asphalt binders was found from the producing aged binder to simulate waste asphalt binders. As the binders age, the penetration ratio decreases but the decreasing rate gradually reduces, while the viscosity and stiffness gradually grows.
제안 방법
The RTFO-aged binder is calculated for mass loss and then used for the DSR test and the PAV aging. After aging, the mass loss is calculated, and then the aged binder is used for the DSR test and the RAV aging. The RTFO is specified by AASHTO T240 and ASTM D 2872.
In this study, asphalt binder properties, i.e., viscosity, penetration, and PG grade, are evaluated by different added ratios of rejuvenator, such as 0%, 5%, 10%, and 15%. Detail information on the laboratory tests can be seen in Fig.
It is because the DSR test is not appropriate for rejuvenator due to low consistency. In this study, therefore, the PG grades were used to estimate the amount of rejuvenator required based on the PG grade 64 at high temperature. Two types of rejuvenator were selected.
대상 데이터
In this study AP-5, which is produced in Korea with the penetration grade 60-80, is used. Table 1 shows the properties and PG grade of AP-5.
In this study, one type of rejuvenators (RS) produced in Korea and four types of rejuvenators (RC, RA, RF, and RW) produced in Japan or USA were employed. Table 2 shows the result of the thin layer chromatography (TLC) test performed to analyse the chemical components of rejuvenators.
성능/효과
2. For the recycling method based on the penetration ratio indicator, with the target penetration ratio of 70, the amount of rejuvenator required to be mixed with aged asphalt is 4.14% for short-term-aged binder, 25.64% for long-term-aged binder and 39.23% for the longest-termaged binder.
3. For the recycling method based on the viscosity indicator, with the target viscosity of 400cP, the optimum amount of rejuvenator required to achieve the target is 8.99% for short-term-aged binder, 21.9% for long-term-aged binder and 22% for the longest-term-aged binder.
4. For the recycling method based on the PG grade (high temperature), with the target PG of 64, the amount of rejuvenator required to achieve the target is 0~7.38% for short-term-aged binder, 17.34~23.7% for long-term-aged binder and 19.86~26.8% for the longest-term-aged binder.
6 (e). Based on the target viscosity of 400cP, the amount of rejuvenator required can be determined 8.99%, 21.9%, and 22% for RT (RTFO), RP (RTFO+RAV), and PP (RAV+RAV) respectively.
참고문헌 (15)
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