• 한국도로학회논문집
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• 제7권1호
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• pp.63-71
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• 2005

아스팔트바인더등급은 아스팔트바인더의 품질을 포장의 공용성과 관련하여 등급화한 것으로, 혼합물배합설계에 있어서 중요재료인 아스팔트를 적절히 선정하는 데 필수적인 정보를 제공한다. 이러한 목적을 위해 미국은 1990년대 중반에 PG-등급을 개발하여 현장에 적용하고 있다. 국내에서도 최근에 미국의 PG-등급을 들여와서 바인더규정으로 채택하고 있다. 그러나 일본, 중국을 비롯한 아시아 지 역이나 유럽의 대부분 나라들은 미국과는 달리 침입도나 점도등급을 고온등급으로 사용하고 있다. 본 연구의 목적은 미국의 PC-등급의 타당성을 분석하는 데 있다. 분석결과는 이등급에 심각한 오류가 있음을 말해주며 , 이를 해결하기 위한 대안으로 보다 정확한 바인더등급 이론식이 소개된다. 상기 식들을 이용하여 현장가속시험기나 실내 바퀴주행시험기에서 얻어진 문헌의 데이터를 예측함으로서 본 논문에서 주장하는 내용들을 입증한다.

• 한국도로학회논문집
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• 제14권5호
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• pp.47-55
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• 2012

PURPOSES: SUPERPAVE binder grade tests including Multiple Stress Creep and Recovery(MSCR) test are applied to evaluate rheological properties of four polymer modified binders. METHODS: To evaluate grade of four modified binders, PG testing protocols, such as DSR, BBR and MSCR are employed. RESULTS: It is observed that MSCR test shows different performance grades especially on modified binders. Both DMP and EG binder show similar high temperature performance to SBS 5% modified binder. CONCLUSIONS: Binder Grading system in Korea need to be reviewed to properly reflect the performnace of modified binders. The binders modified with DMP and EG can be possible alternatives SBS 5% modified binder considering its performance and cost.

• 한국도로학회논문집
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• 제16권2호
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• pp.19-24
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• 2014

PURPOSES : The study objective was to evaluate rheology and physical properties of SBS-modified warm-mix asphalt (WMA) binders in comparison with hot-mix asphalt (HMA) binders. METHODS : Four different SBS polymers were used to prepare polymer-modified asphalt (PMA) binders, and three different warm-mix additives (WAD) were used to prepare a total of 12 WMA PMA binders. The kinematic viscosity was measured at 115, $135^{\circ}C$. The PG was determined using DSR and BBR. The pass/fail (P/F) temperatures for high and low PG grading were evaluated for HMA PMA and WMA PMA binders. RESULTS : PG 76-22 binders could be prepared by modifying the base binder (PG 64-22) using 4.5 wt% of SBS. The kinematic viscosity (KV) of SBS PMA was increased by 3 times higher than that of base asphalt. The SBS PMA with WAD showed 10% lower KV than that of the normal SBS PMA at $115^{\circ}C$ The high P/F temperatures showed almost no difference between HMA PMA and WMA PMA binders. The high P/F temperature showed very high correlations with KV ($R^2$ > 0.97). The result of SBS modification caused increase of low P/F temperature by $2.7^{\circ}C$ on average. CONCLUSIONS : Since the PMA with WAD showed 10% lower KV than normal (HMA) PMA at $115^{\circ}C$, reducing PMA mixture temperature down to a WMA level was possible in this study. The higher KV binders showed the higher P/F temperature. There was almost no change in high P/F temperature due to the use of WAD. The SBS PMA, showing an increased low P/F temperature, might show somewhat poorer performance at low-temperature, even though the lower PG grade was staying at the same level, i.e., $-22^{\circ}C$.