PURPOSES : In Korea, asphalt overlay has been used as a typical alternative rehabilitation method for deteriorated pavements. However, asphalt overlay has problems due to poor bonding of the asphalt overlay and the old concrete. Recently, concrete overlays, which have advantages such as long-term durability and high structural capacity to carry heavy traffic, have been considered for rehabilitation construction. However, concrete overlays have limitations such as difficulty in opening to traffic and pavement noise. Recently, an appropriate fine-size exposed aggregate concrete pavement technique was reported to solve these problems. Therefore, this study aims to suggest an optimum mixture design of fine-size exposed aggregate concrete overlay (EACO) that can ensure low noise and early strength.
METHODS : The optimum mixture design of fine-size EACO is determined to ensure adequate structural performance for early traffic opening and good functional performances such as low noise. Therefore, the optimum mixture proportion is determined based on the optimum design of aggregate content to produce a low-noise pavement texture by controlling the exposed aggregate number (EAN) and mean texture depth (MTD).
RESULTS : The water-cement ratio and unit cement ratio were used to determine the mixture designs to achieve workability and adequate strength for early traffic opening. The texture was determined by selecting the maximum size of coarse aggregate smaller than 10 mm with an S/a ratio of less than 30% for low noise. With these mixture proportions, the EAN and MTD were 50±5 / 25cm2 and 1.0±0.2 mm. Respectively, which meet the criteria for EACO.
CONCLUSIONS: In this study, an optimum mixture design of EACO for early traffic opening and low noise is suggested by using earlyhigh strength cement, and the pavement texture is implemented considering EAN and MTD. In addition, a pavement surface texture criterion is suggested for the quality control of EACO.

ABSTRACT
 1. 서론
 2. 소입경 골재노출콘크리트포장의 특성
  2.1. 타이어-노면 소음의 특성
  2.2. 국내·외 소입경 골재노출 콘크리트포장의 소음측정 분석
  2.3. 소입경 골재노출 콘크리트포장의 미끄럼저항 특성
  2.4 국내·외 골재노출 콘크리트포장 시방배합의 특성 검토 및 분석
 3. 덧씌우기용 소입경 골재노출 콘크리트포장의 배합 도출을 위한 연구전략
  3.1. 덧씌우기용 소입경 골재노출콘크리트포장의 노면특성 검토
  3.2. 굵은 골재의 최대입경 및 함량에 따른 골재노출 콘크리트포장의 노출도와 노면조직깊이 특성
  3.3. 덧씌우기용 소입경 골재노출 배합을 위한 배합설계 프로세스
 4. 덧씌우기용 소입경 골재노출 콘크리트포장의 배합방안 연구
  4.1. 배합 도출을 위한 실험절차 및 방법
  4.2. 실험 결과 및 분석
  4.3. 덧씌우기용 소입경 골재노출 콘크리트의 배합비 선정
 5. 결론
 REFERENCES

• 김재훈(강릉원주대학교 토목공학과) | Kim Jae Hoon
• 김영규(강릉원주대학교 방재연구소) | Kim Young Kyu
• 이승우(강릉원주대학교 토목공학과) | Lee Seung Woo 교신저자