Many methods are proposed for a measurment method of unit water content in fresh concrete. In the present conditions, it is absent to situation that those test methods are utilized to process control and acceptance inspection. The case is sampling errors of sample size, sampling method, adjustment and test errors of measurement accuracy, resolution performance of measuring device, fluctuation of input data for calculation and bias of measured value. When those are integrated, it is raised that it becomes a fairly large value to the value of unit water content that it wants to request. It is expressing about the need of deletion of the sampling error and revision of the bias in addition to improvement of only a measurement method to eliminate the error factor, beside examination is added to such error factor and the size.
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