Estimating the Distribution of Air Voids in Concrete

• Main Authors: McCuen R.H., Beasman L.E.
• Format: Article
• Language: English
• Published: Petra Christian University 2011-01-01
• Series: Civil Engineering Dimension
• Subjects: Concrete; air voids; gradation curves; simulation; linear-traverse method.
• Online Access: http://puslit2.petra.ac.id/ejournal/index.php/civ/article/view/18103

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.