비파괴시험 자료를 적용한 콘크리트 기준강도의 통계적 추정

Abstract

The aim of the paper is to introduce the statistical definition of the specified compressive strength of the concrete to be usedfor safety evaluation of the existing structure in domestic practice and to present the practical method to obtain the specified strengthby utilizing the non-destructive test data as well as the limited number of core test data. The statistical definition of the specifiedcompressive strength of concrete in the design codes is reviewed and the consistent formulations to statistically estimate the specifiedstrength for assessment are described. In order to prevent estimating an unrealistically small value of the specified strength due tolimited number of data, it is proposed that the information from the non-destructive test data is combined to that of the minimum coretest data. The the sample mean, standard deviation and total number of concrete test are obtained from combined test data. Theproposed procedures are applied to an example test data composed of the artificial numerical values and the actual evaluation datacollected from the bridge assessment reports. The calculation results show that the proposed statistical estimation procedures yieldreasonable values of the specified strength for assessment by applying the non-destructive test data in addition to the limited number ofcore test data