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제안 방법
- In order to find out the association characteristics of asphaltene in THF (tetrahydrofuran), which was used as solvent of asphalt for GPC test, binder was dissolved in THF for 0.5 wt% solution which was determined as a suitable concentration for RI detector used in this GPC system. Asphaltene characterized with high mass is considered to exist mainly in LMS and asphaltene content of base asphalt increased by artificial aging as shown in Table 5.
- et al 1999). In this study a chromatogram was partitioned into 13 slices and three molecular groups, large molecular size (LMS: slice 1 to 5 from left), medium molecular size (MMS: slice 6 to 9) and small molecular size (SMS: slice 10 to 13) as shown in Figure 1.
- Therefore, since LMS does change by incubation time, the GPC data from 3-hour incubation were used for analysis in this study. It is recommended that three- hour incubation or approximately the same incubation time should be used throughout the study to obtain more consistent test results from GPC analysis.
- However, the degree of association, resulting in increment of LMS, in THF solution was related with the amount of high-molecular-weight molecules in the binder, depending upon incubation time. Therefore, the incubation time is important and incubation for three hours should be applied or the same incubation time should be used throughout the study to obtain consistent test results from GPC analysis.
대상 데이터
- Four base asphalts were collected from three different refineries in Korea, and designated as H- AP3, L-AP3, S-AP3, and S-AP5. The penetration grade of the AP3 asphalt is 85-100 and that of AP5 asphalt is 60-70.
- The penetration grade of the AP3 asphalt is 85-100 and that of AP5 asphalt is 60-70. Polymers used in this study were LDPE (low-density polyethylene) and SBS (styrene- butadiene-styrene block copolymers). These polymers were originally selected as the best performing modifiers from several choices for reducing rutting and improving tensile properties of asphalt mixture in previous studies (Kim 1996, Kim et al 1998).
이론/모형
- Absolute viscosity (AVS), kinematic viscosity (KVS) and penetration (PEN) were measured by ASTM D2170, ASTM D2171 and ASTM D5, respectively. High-temperature and low- temperature performance grade (PG) were measured by Strategic Highway Research Program (SHRP) method using dynamic shear rheometer (DSR) and bendin응 beam rheometer (BBR), respectively.
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