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A Study on Aggregate Mix Design of Dumbbell-shape Fiber Reinforced Asphalt Concrete Mixture using Bailey Method

베일리 방법을 이용한 아령형 섬유보강 아스팔트 혼합물의 골재 배합설계법 연구

  • Ham, Sang-Min (Highway Pavement Research Division, SOC Research Institute, Korea Institute of Construction Technology)
  • 함상민 (한국건설기술연구원 SOC성능연구소 도로포장연구실)
  • Received : 2013.10.16
  • Accepted : 2013.12.05
  • Published : 2013.12.31

Abstract

The aim of this study was to develop a fiber-reinforced asphalt mixture that was designed to do the following: 1) address fatigue cracks, which is a major source of damage; and 2) increase the rutting resistance. This study reports the effects of the aggregate mixture design that incorporates a dumbbell-shaped fiber. An experiment was carried out to measure the unit weights and unit weight ratios between the mixture that was compacted and the one that was not. A method to substitute a specific aggregate mixture with the dumbbell-shaped fiber was confirmed using the volume concept according to the Bailey method. The results showed that the weight of the PCS aggregate mixture that need to be replaced was 11.88g when a 0.3% reinforcing fiber was added to the 1950g mixture.

본 연구는 아스팔트 혼합물의 주요 파손 형태인 피로균열과 러팅 저항성을 증가시키기 위한 섬유보강아스팔트 혼합물을 개발하기 위한 연구로서, 보강섬유를 고려한 골재 혼합물의 배합설계법에 대한 연구 결과를 나타내고 있다. 실험을 통하여 다졌을 때와 다지지 않았을 때의 단위중량 및 단위중량 비를 산정하였으며, 굵은 골재와 중간골재의 단위 중량비는 1.100, 1.119, 잔골재의 단위 중량비는 1.137로 굵은 골재나 중간 골재에 비하여 다소 큰 것으로 확인되었다. 부피 개념을 이용하여 특정 골재(4.75mm, #4)를 아령형 보강 섬유로 치환하는 방법을 베일리 방법을 사용하여 확인하였는데 1950g의 혼합물에 0.3%의 보강 섬유를 첨가하였을 때 섬유와 교체되어야 할 PCS골재의 무게는 11.88g으로 계산되었다. 따라서 본 연구에서는 골재와 보강섬유의 특성을 최대한 설계에 반영할 수 있는 골재의 배합설계 방법 개발을 통하여 기존의 수퍼페이브 배합설계법이 가지는 단점을 극복하고 자원 활용을 극대화 하고자 한다.

Keywords

References

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