보도용 연성 샌드 아스팔트 포장의 충격흡수 특성 평가
Evaluation of Impact Energy Absorption Characteristics of Flexible Sand Asphalt Pavement for Pedestrian Way
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초록
More than 90% of roadway in the world are paved as asphalt concrete pavement due to its excellent properties compared with other paving materials;excellent riding quality, flexibility, anti-icing property and easy maintenance-ability. In this study, to make best use of the softer property of the asphaltmixture, the flexible sand asphalt mixture (FSAM) was developed for pedestrian ways. The mix design was conducted to prepare FSAM using PG64-22asphalt, screenings (sand) less than 5㎜, crumb rubber, hydrated lime and limestone powder without coarse aggregate. The deformation strength (SD),indirect tensile strength (ITS) and tensile strength ratio (TSR) tests were conducted to make sure durability of FSAM performance. The impact energyabsorption and flexibility were measured by drop-boll test and the resilient modulus (MR) test. The impact energy absorption of FSAM was comparedwith normal asphalt pavement, concrete pavement, stone and concrete block for pedestrian way. As a result of drop-boll test, FSAM showed higherimpact energy absorption compared with other paving materials with the range of 18% to 43%. Impact energy absorption of FSAM increased withincreasing test temperature from 5 to 40℃. The results of MR test at 5℃ showed that the flexibility of FSPA was increased further, because the MRvalue of the sand asphalt was measured to be 38% lower than normal dense-graded asphalt mixture (WC-1). Therefore, it was concluded that the FSAMcould provide a high impact absorbing characteristics, which would improve walking quality of the pedestrian ways.
Abstract
More than 90% of roadway in the world are paved as asphalt concrete pavement due to its excellent properties compared with other paving materials;excellent riding quality, flexibility, anti-icing property and easy maintenance-ability. In this study, to make best use of the softer property of the asphaltmixture, the flexible sand asphalt mixture (FSAM) was developed for pedestrian ways. The mix design was conducted to prepare FSAM using PG64-22asphalt, screenings (sand) less than 5㎜, crumb rubber, hydrated lime and limestone powder without coarse aggregate. The deformation strength (SD),indirect tensile strength (ITS) and tensile strength ratio (TSR) tests were conducted to make sure durability of FSAM performance. The impact energyabsorption and flexibility were measured by drop-boll test and the resilient modulus (MR) test. The impact energy absorption of FSAM was comparedwith normal asphalt pavement, concrete pavement, stone and concrete block for pedestrian way. As a result of drop-boll test, FSAM showed higherimpact energy absorption compared with other paving materials with the range of 18% to 43%. Impact energy absorption of FSAM increased withincreasing test temperature from 5 to 40℃. The results of MR test at 5℃ showed that the flexibility of FSPA was increased further, because the MRvalue of the sand asphalt was measured to be 38% lower than normal dense-graded asphalt mixture (WC-1). Therefore, it was concluded that the FSAMcould provide a high impact absorbing characteristics, which would improve walking quality of the pedestrian ways.
참고문헌 (29)
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