• 한국도로학회논문집
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• 제19권2호
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• pp.25-34
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• 2017

PURPOSES: The purpose of this paper is to evaluate interface performance while using various tack coat materials for asphalt overlay. METHODS : The evaluation was conducted with tracking test, permeability, and interface bond strength. Tracking test was conducted using an image processing technique, to investigate the susceptibility of the tack coat materials. BBS and pull-off test were conducted to evaluate bond strength. The permeability test was conducted to evaluate the effect of tack coat materials. RESULTS : Results reveal that the trackless tack coat material demonstrates less tracking compared to other materials. Moreover, both BBS and pull-off tests can effectively evaluate the bond strength at the interface. RSC-4 was measured less bond strength. Moreover, tack coat prevents water penetration through the surface and aids the extension of the surface life of asphalt pavement. CONCLUSIONS : Trackless tack coat demonstrated a high and consistent bond strength performance. The tack coat types demonstrate marginally different performance as function of curing times. Field applicability was tested based on visual observation. Therefore, these should be considered when trackless tack coat is slightly enhanced the pavement performance based on limited this study results. Finally, it is necessary to allow reasonable time for the tack coat to completely cure.

• 한국도로학회논문집
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• 제18권5호
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• pp.1-9
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• 2016

PURPOSES : This study focuses on the evaluation of interface performance with varying surface texture and tack coat application in an asphalt overlay. METHODS : The evaluation is carried out in two phases: tracking test and interface bond strength test. Using an image processing tool, tracking test is conducted to evaluate the susceptibility of the tack coat material to produce excessive tracking during application. Using the pull-off test method, the bond strength test is performed to determine the ability of the interface layer to resist failure. RESULTS : Results show that the underseal application yields less tracking compared to other applications. However, the bond strength is barely within the minimum acceptable value. On the other hand, RSC-4 produces higher bond strength for all surface types, but the drying time is long, which produces excessive tracking. CONCLUSIONS : While underseal application may be suitable for a trackless condition, the bond strength is less appealing compared to the rest of the tack applications available. RSC-4 demonstrated a high and consistent bond strength performance, but more time is required for drying to avoid excessive tracking. Tack coat application and surface type combination produce varying results. Therefore, these should be considered when selecting suitable future tack coat application options.

• 한국방재학회 논문집
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• 제9권1호
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• pp.27-32
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• 2009

본 연구의 주목적은 아스팔트 포장층간의 접착전단강도를 측정하는 실험법과 평가 방법을 개발하고 배수성 포장에 사용되는 택코트 재료의 특성과 적정 살포량을 평가하고자 하였다. 실험에는 두 종류(RSC-4, 개질유화)의 유화아스팔트와 가열 아스팔트바인더 타입(HM-1) 한 종류로 실시하였으며, HM-1은 배수성 포장에 사용하기 위해 새로 개발된 제품이다. 접착전단강도를 측정하기 위해 직접전단실험을 다양한 실험 조건에서 수행하였다. 실험을 통해 얻은 접착전단강도 값은 결과의 변별력이 떨어 졌으며 하중-변위 곡선의 면적인 터프니스가 접착전단강도를 평가하는데 보다 유용한 것을 확인 할 수 있었다. 배수성 포장의 경우 RSC-4의 경우는 $0.8l/m^2$ 이상, 개질유화아스팔트의 경우는 $0.5{\sim}0.6l/m^2$의 살포량이 적당한 것으로 나타났다. Trackless 성능이 우수한 HM-1은 유화 아스팔트 택코트에 비해 월등히 좋은 접착전단성능을 발휘하는 것으로 나타났다.