혼화재 및 섬유 콘크리트의 비파괴 실험에 의한 장기재려 강도 추정 = The Estimation of Long Aged Strength by Non-destructive Testing of Concrete used Mineral Admixture and Fiber

다국어 초록 (Multilingual Abstract)

This study made cylindrical specimen and core tube specimen of concrete using admixture and estimated their strength of long-term age (4years) through non-destructive and destructive testings. As a result, comparing error rates between conventional equations and estimation equations showed what there are a little differences by age, simultaneously error rate of this study was 0.6%~18.6% reduced to 0.3%~15.5% when compared to conventional equations by re-bound hammering ultrasound velocity method and 0.6%~34.2% was obtained by complex method and it is judged that it is desirable to be used for concrete using admixture and fiber. Since application of existing expression of normal concrete against concrete using admixtures causes error rate, this study suggests that following estimation expression depending on the kind of admixtures of concrete using them and position of non-destructive experiment. In addition, the estimation equation by this study showed that higher error rates in 7~14 days of age than other ages and it is considered that a method to reduce the error rate in early age that needs to be devised.