[논문]준고온 아스팔트 콘크리트 피로저항성 평가

김성운; 이성진; 김광우

doi:10.5389/ksae.2020.62.3.029

준고온 아스팔트 콘크리트 피로저항성 평가
Evaluation of Fatigue Resistance of Selected Warm-mix Asphalt Concrete 원문보기

한국농공학회논문집 = Journal of the Korean Society of Agricultural Engineers, v.62 no.3, 2020년, pp.29 - 38

김성운 (Department of Regional Infrastructure Engineering, Kangwon National University) , 이성진 (Pavement Research Division, Korea Expressway Corporation Research Institute) , 김광우 (Department of Regional Infrastructure Engineering, Kangwon National University)

Abstract ▼ AI-Helper

Since some warm-mix asphalt (WMA) concretes were known to show poorer rut resistance than the hot-mix asphalt (HMA) concretes, many studies were performed in efforts of improving its performance at high temperature. The reason is assumed to be due to the moisture remaining in aggregates dried at lower temperature. Therefore, not only the rut resistance, the crack resistance of WMA concrete was also in question. In this study, fatigue life of WMA concrete was evaluated in comparison with HMA using 3-point bending (3PB) beam test. The asphalt mixtures were prepared based on Korean mix-design guide using a 13 mm dense-graded aggregate and 6 binders; two HMA binders and four WMA binders. By 3PB fatigue test, normal (unmodified) and polymer-modified WMA concretes were evaluated in comparison with normal and polymer-modified HMA concretes at a low temperature (-5℃). The results showed that most of WMA concretes showed longer fatigue lives than HMA concretes, even though the same PG binders were used for HMA and WMA. This result indicates that the WMA concretes have stronger resistance against fatigue cracking than HMA at the low temperature, and this result is in contrast to the high-temperature performance test.

주제어

표/그림 (13)

표 Table 1 Designation of each binder and description
그림 Fig. 1 Gradation curve of 13 mm aggregate (WC-6) (MOLIT, 2017)
그림 Fig. 3 3PB fatigue test setup
그림 Fig. 4 Illustration of fatigue test loading cycle
그림 Fig. 2 (a) Setting for SD test and (b) P-v curve acquired from a Kim Test (Kim et al., 2004, 2011)
표 Table 2 Kinematic viscosity and performance grade (PG)
표 Table 3 Fundamental properties of each mixture at OAC
그림 Fig. 5 Comparison of no. of cycles to failure (Nf) by mix type, stress level and polymer
표 Table 4 Fatigue test results (average value)
그림 Fig. 6 Fatigue life of unmodified mixtures
그림 Fig. 8 Fatigue life of two modified HMA mixtures
그림 Fig. 7 Fatigue life of LVM-modified mixtures
그림 Fig. 9 Fatigue life of two PMA WMA mixtures

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문제 정의

Therefore, the fatigue resistance of WMA concrete is worth examining in comparison with HMA concrete. Therefore, as observed in rut testing, since the WMA concrete is assumed to have weaker resistance against dynamic wheel loading, the objective of this study was to evaluate the fatigue resistance of selected WMA concretes at a low temperature in comparison with HMA concrete.
This study evaluated the fatigue resistance of warm-mix asphalt (WMA) concretes at low temperature in comparison with hot-mix asphalt (HMA) concretes. The fatigue life was measured by the dynamic loading at 1 Hz in a 3-point bending beam mode at -5℃.

가설 설정

1. The high-temperature deformation resistance of WMA concretes measured by S_D was slightly lower than that of HMA, which was prepared using the same PG level binders. However, all S_D values of WMA mixture were found to satisfy the minimum value of the S_D specification limit.
2. The WMA mixtures were found to have longer fatigue lives at -5℃ than HMA mixtures prepared with the same binder and aggregate under the same stress level. The most acceptable reason to asphalt engineers is the lower heating temperature which does not induce serious binder aging during production and short-term aging period, compared with HMA temperatures.

제안 방법

Design criteria included the following 4 properties; air voids ratio (AVR), voids filled with asphalt (VFA), voids in mineral aggregate (VMA), and the strength against deformation (S_D ). Specification limits were 3∼5%, 65∼8 0% and minimum of 14% for AVR, VFA and VMA, respectively.

대상 데이터

In this study, a total of 6 mixtures prepared from 1 aggregate, 2 WMA additive (including a control) and 3 polymers (including an unmodified binder). The mixture was compacted by 100 gyrations using a Superpave gyratory compactor to make a 100 mm diameter specimen.
The 13 mm dense graded HMA mixture was prepared for satisfying the specifications set forth by Korea Ministry of Land, Infrastructure and Transport (MOLIT, 2017) for surface type WC-6 HMA mixtures. The design aggregate gradations of WMA were the same as the HMA gradation.
The experimental design included the use of a base asphalt (PG64-22), a WMA additive (Pexbol, abbreviated as Pe), two polymers [a mixed polymer of LDPE, EVA, and EPDM (LVM) and styrene-butadiene-styrene (SBS)] and two mix types (HMA and WMA). The Pe is a laboratory prepared porridge-type compound of two waxes and a bio-oil.

이론/모형

Since the Poisson’s ratio of asphalt concrete at low temperatures is similar to the Poisson’s ratio level of plain concrete (Kim et al., 1999), a 3point bending (3PB by KS F 2395) mode fatigue test (KS F 278) was used for asphalt concrete at -5°C in this study.
The S_D, which was invented to estimate the strength against deformation at high temperatures (Kim et al., 2004, 2011), was adopted as one of the four criteria in the Korean mix-design guide (MOLIT, 2017). A static load was applied through a loading head on top of a 100 mm or 150 mm diameter specimen immersed in water bath at 60±1℃ for 30 minutes before testing, as shown in Fig.

성능/효과

3. These findings lead to the conclusion that the WMA mixture is not susceptible to, but more resistible to the fatigue failure than the HMA mixture at low temperature, even though they were produced at a 30∼40℃ lower aggregate-heating temperature.
4. The fatigue life of all asphalt mixtures used in this study was significantly decreased by the stress level increase. Most of the reduction ratios were more than 50% by every 10% stress level increase from the stress level of 50%, even though there are some differences in polymer and mixture type (WMA and HMA).
8. The LVM WMA mixture showed the longest fatigue life than SBS WMA and LVM HMA mixtures, making the largest difference between HMA and WMA. The unmodified mixture, however, showed the lowest difference between HMA and WMA.

참고문헌 (26)

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