Rapid in-place air content determination in fresh concrete

Document Type

Article

Publication Date

1-1-1991

Abstract

A new fiber optic apparatus has been developed to determine the amount and distribution of the air void system in freshly mixed concrete in situ so as to facilitate acceptance or rejection in the field. The apparatus detects air bubbles in fresh concrete by measuring changes in the intensity of reflected light transmitted through a thin optical fiber that occur due to differences in the index of refraction between an air bubble and concrete. Accuracy, reliability, and speed of the new fiber optic airmeter was examined through repeated experiments compared against conventional techniques. The fiber optic airmeter utilizes a simple calibration procedure to allow accurate measurements in all types of mixes irrespective of variations in mix proportions.

Identifier

0026049046 (Scopus)

Publication Title

Concrete International

ISSN

01624075

First Page

39

Last Page

43

Issue

1

Volume

13

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