STUDY OF NON-DESTRUCTIVE MEASUREMENT FOR UNIT WEIGHT AND WATER CONTENT OF CONCRETE USING RADIO ISOTOPE METER

Abstract

This paper discusses a measurement method of unit weight and water content of concrete using radio isotope meter. Concrete members with different unit weight were measured them at the age of 7, 28 and 91 days. As a result, it was found the following things. If the unit weight of concrete is high, the measurement accuracy of the unit weight and water content using radio isotope meter is low. Inserting the radio isotope source a sleeve, it can reduce variations in measurements. The drying of concrete read from radio isotope meter. The calibration curve between the unit weight of concrete and the attenuation of radiation was created.