This paper investigates the effects of aspect ratio and volume fraction of hooked-end normal-strength steel fibers on the compressive and flexural properties of high-strength concrete with specified compressive strength of 60 MPa. Three types of hooked-end steel fibers with aspect ratios of 64, 67 and 80 were considered and three volume fractions of 0.25%, 0.50% and 0.75% for each steel fiber were respectively added into each high-strength concrete mixture. The test results indicated that the addition of normal-strength steel fibers is effective to improve compressive and flexural properties of high-strength concrete but fiber aspect ratio had little effect on the modulus of elasticity and compressive strength. As steel fiber content and aspect ratio increased, flexural beahvior of notched high-strength concrete beams was effectively improved.

Abstract
1. 서론
2. 실험 계획 및 방법
    2.1 실험 계획
    2.2 사용 재료
    2.3 실험체 제작 및 실험방법
3. 실험결과 및 분석
    3.1 압축 특성
    3.2 휨 특성
4. 결론
감사의 글
Reference

• 정우진(충남대학교 건축공학과, 석사과정) | Jeong Woo-Jin (Department of Architectural Engineering, Chungnam National University)
• 김애화(충남대학교 건축공학과, 박사과정) | Jin Ai-Hua (Department of Architectural Engineering, Chungnam National University)
• 윤현도(충남대학교 건축공학과 교수) | Yun Hyun-Do (Department of Architectural Engineering, Chungnam National University) Corresponding author