국내 환경에 노출된 콘크리트의 압축강도와 초음파속도와의 상관관계 검토
A Study on the Correlation Between Compressive Strength and Ultrasonic Velocity of Concrete Exposed to Domestic Environments
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초록
본 논문에서는 국내 환경에 약 15년간 노출된 다양한 콘크리트를 대상으로 재령별 압축강도와 초음파속도를 측정하였으며, 콘크리트의 종류에 따라 압축강도와 초음파속도와의 상관관계를 검토하였다. 시험체는 총 여섯 배합으로 1종 보통포틀랜드 시멘트를 사용한 물/시멘트비에 따른 3종(w/c 40%, 50% 및 60%)과 혼화재료 종류에 따른 3종(고로슬래그, 플라이애시 및 실리카흄)으로 구분되며, 재령별 압축강도와초음파속도를 측정한 후 두 가지 항목에 대한 상관관계를 검토하였다. 재령별 압축강도를 분석한 결과, 시험체 종류에 관계없이 재령이 증가함에 따라 압축강도가 증가하는 경향을 나타내었다. 물/시멘트비 종류에 따른 초음파속도를 분석한 결과 재령 28일 초음파속도 대비 약 물/시멘트비가 감소할수록, 재령이 증가할수록 초음파속도가 증가하는 경향을 나타내었으며, 재령에 따라 재령 28일 초음파속도 대비 약 0.02 ~ 0.20 km/s의 속도 증가가 발생하였다. 혼화재료 종류에 따른 초음파속도 결과 역시 재령이 증가함에 따라 초음파속도가 증가하는 경향을 나타내었으며, 재령에 따라 재령 28일 초음파속도 대비 약 0.05 ~ 0.38 km/s의 속도 증가가 발생하였다. 물/시멘트비 종류에 따른 압축강도와 초음파속도와의 상관관계를 분석한 결과 물/시멘트비가 감소함에 따라 초음파속도가 증가하는 선형적인 관계를 나타내었으며, 물/시멘트비가 감소함에 따라 압축강도와 초음파속도와의 상관관계가 더 높게 나타내었다. 한편, 혼화재료 종류에 따라 압축강도와 초음파속도와의 상관관계를 분석한 결과 혼화재료 종류에 관계없이 압축강도와 초음파속도와의 상관관계가 낮은 것으로 나타내었으며, 이러한 경향은 압축강도 50 MPa 이상의 구간에서 더 크게 나타내었다.
Abstract
This study measured the compressive strength and ultrasonic pulse velocity of various concretes exposed to the domestic environments for approximately 15 years, and investigated the relationship between the compressive strength and ultrasonic velocity. The test specimens were divided into three types (w/c 40%, 50%, and 60%) according to the water/cement ratio using ordinary portland cement and three types (blast furnace slag, fly ash, and silica fume) according to the type of admixture. The analysis of the compressive strength showed that, regardless of the specimen type, the compressive strength increased with age. As a result of analyzing the ultrasonic velocity according to the type of water/cement ratio, the ultrasonic velocity showed a tendency to increase as the water/cement ratio decreased and as age increased, and the ultrasonic velocity at 15 years of age increased by about 0.11 to 0.20 km/s compared to the ultrasonic velocity at 28 days of age. The results of ultrasonic velocity according to the type of admixture also showed that the ultrasonic velocity tended to increase as the age increased, and the velocity increased by about 0.08 to 0.38 km/s compared to the ultrasonic velocity at 28 days. As a result of the correlation between compressive strength and ultrasonic velocity according to the type of water/cement ratio, a linear relationship was shown in which ultrasonic velocity increased as the water/cement ratio decreased. Meanwhile, the results of analyzing the correlation between the compressive strength and ultrasonic velocity according to the type of admixture showed a lower correlation between compressive strength and ultrasonic pulse velocity.
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