Abstract
The unit water content in a fresh concrete is one of the most important factors that control a concrete quality. In this study, it aimed at the development of the measurement method of unit water content by inserting a cylinder shape neutron water meter in the fresh concrete in the drum of agitator track. When developing, the influence of the agitating condition of the drum, the necessity of the compensation by the gamma-ray densimeter and time necessary for the measurement was verified by measuring fresh concrete that set the unit water content in the drum of the agitator track to five levels. As a result, it was confirmed that should make the drum a low-speed agitating condition, to have not always be necessary the compensation by the gamma-ray densimeter, should measure for two minutes or more. In addition, a good working efficiency was confirmed by the real construction.
