For some overseas concrete, there is a possibility of large variations in concrete strength due to large fluctuations in unit water content because aggregate is stored in the open air. In addition, the quality control level of engineers varies widely. In this paper, we propose a method to quickly estimate the strength of concrete by measuring the electrical conductivity of concrete at the time of the acceptance inspection of concrete at the site. From the trial results, it is considered that this method is suitable for use in screening concrete whose strength deviates significantly from the formulation control strength.
