Estimating the Distribution of Air Voids in Concrete


  • Beasman L.E. Research Assistant, Dept. of Civil Engineering, Univ. of Maryland, College Park, MD 20742
  • McCuen R.H. Professor, Dept. of Civil Engineering, Univ. of Maryland, College Park, MD 20742



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.


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How to Cite

L.E., B., & R.H., M. (2011). Estimating the Distribution of Air Voids in Concrete. Civil Engineering Dimension, 13(1), 15-20.