A Radioisotope Backscatter Gauge for Measuring the Cement Content of Plastic Concrete.

摘要

The objectives were: (1) to evaluate the prototype nuclear cement content gauge for various cement contents,bulk densities,and aggregate types and sizes;and (2) to make and evaluate such modifications to the gauge as were necessary to meet the overall design goal. The report includes a discussion on the design and operation of three evolutionary models of the gauge; a summary on the accuracy of cement content determinations employing each; a discussion of the effects on performance of bulk density,aggregate composition,ambient temperature,and other parameters;and a list of conclusions and recommendations.