ISSN: 0149-6123
Page Count: 11

Evaluation of Precision of a Nuclear Gauge for Measurement of Water and Cement Content of Fresh Concrete
Nagi, M
Research engineer, and senior principal engineer, Construction Technology Laboratories, Inc., IL

Whiting, D
Research engineer, and senior principal engineer, Construction Technology Laboratories, Inc., IL

Abstract

An experimental program was conducted to develop a precision statement for a commercially available nuclear field gauge developed to measure both water and cement contents of fresh concrete. Five gauges were tested at a single site. Three separate batches of concrete having different mixture proportions were tested; each gauge was run by a single operator. Data analysis was carried out following ASTM C 802-94 and the precision statements were developed in accordance with ASTM C 670-91a. Gauge count ratio was used rather than actual cement and water content to avoid the errors associated with gauge calibration. The “one-sigma limit” and the “difference two-sigma limits” were obtained. The precision estimates appear to reflect actual experience with the gauge and can be used to compare results obtained in the field.

Keywords:
cement content, concrete, laboratories, precision, nuclear gauge, statistics, testing, water content

Paper ID: CCA10502J
DOI: 10.1520/CCA10502J
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