아스팔트 혼합물의 공용특성과 상관성이 높은 시험특성 분석 = Analyses for finding better test property for estimating serviceability characteristics of asphalt mixtures

다국어 초록 (Multilingual Abstract)

The rut and crack are two most-typical damage patterns in asphalt pavement, and they are induced due to the change of binder stiffness under loading at different temperature. Two test properties used for evaluating rutting resistance at 60°C in this study are wheel tracking (WT) rut depth and strength against deformation (SD). The test property used for evaluating crack resistance is indirect tensile strength (ITS) at 25°C. In addition, Marshall stability (MS) was used as another high-temperature property. Regression analyses were performed to evaluate correlation between two properties each other among the four using various asphalt mixtures. The rut resistance represented by rut depth of WT showed a good correlation with SD with R2 ≒ 0.90 on average. The regressions between ITS and SD, and ITS and WT showed R2 ≒ 0.61 and 0.69 on average, respectively. The reason why one property showed good correlation with another among the three is that those properties are related with binder stiffness. It is well known fact that the mixture with higher stiffness binder showed higher rut resistance and good tensile property. On the other hands, all three regressions between MS and WT, MS and SD, and MS and ITS showed poor correlations with R2 ≒ 0.2 on average. Therefore, it was found that the MS is not the property showing good relation with any performance of asphalt mixture. It was concluded that the WT results could be reliably estimated by SD. Although SD showed somewhat noticeable correlation with ITS, it should be studied further for practical application for estimation of tensile property by . However, it is better not to use Marshall stability as a serviceability index of asphalt mixture.