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Title |
Estimation of Nondestructive Strength Equations Based on the Results of In-situ Concrete Strength for Existing Bridges
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DOI |
https://doi.org/10.11112/jksmi.2018.22.2.098 |
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Keywords |
비파괴강도 시험 ; 콘크리트 압축강도 ; 반발경도 ; 초음파속도 Non-destructive testing ; Concrete compressive strength ; Rebound ; Ultrasonic pulse velocity |
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Abstract |
Nondestructive strength Equations are commonly used to determine the strength of concrete. However, the application of the existing equations may include many errors because this method is proposed on the basis of limited experimental parameters while actual bridges have various parameters such as conditions of concrete mixtures, properties of concrete strength, etc. Also, the error among the existing equations causes the confusion when engineers select the proper estimation equation for the concerned bridge. In this study, a series of the field inspection and the test have been performed on 297 existing bridges, in order to evaluate the bridges, based on the test results of the in-depth inspection, and the estimated strengths by means of the nondestructive strength equations are analyzed and compared with results of the core specimen strengths. According to results of analyses, the nondestructive strength equation proposed by CNDT Committee of Architectural Institute of Japan had high relationship with core strength. However, the strengths predicted by this equation, are underestimated when concrete's strengths are over 30 MPa, otherwise, they are overestimated. Also in this paper, based on the relationship between the estimated nondestructive concrete strengths and the core specimen strengths the modified strength equation through simple correlation analysis is proposed.
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