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Estimating the Distribution of Air Voids in Concrete

Author(s): Beasman L.E. | McCuen R.H.

Journal: Civil Engineering Dimension
ISSN 1410-9530

Volume: 13;
Issue: 1;
Start page: 15;
Date: 2011;
Original page

Keywords: Concrete | air voids | gradation curves | simulation | linear-traverse method.

Chord length measurements are used to estimate the volumetric distribution of air voids within hardened concrete samples. The accuracy of the Linear-Traverse method is questionable because chord lengths do not directly represent the actual volumes of the air voids. Using computer simulation, randomly generated concrete samples were analyzed using the Linear-Traverse method to compute the distribution of air voids, the chord length gradation curve, the chord length-to-traverse ratio, and the air void volume gradation curve. The current chord-length approach significantly underestimated the air void content. A method that estimates that air void gradation curve from the chord length gradation curve is presented. The computer simulation results are supported by a conceptual analysis. To obtain the most accurate estimate of the air void content, computer analyses showed that at least 15 traverse lines should be regularly spaced on the concrete sample.