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Measurement of the density of the top inch of asphalt paving by gamma radiation

  • Laboratory Methods and Devices
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Abstract

An instrument was developed to measure, non-destructively, the density of the top 2.5 cm layer of an asphalt paving. The instrument is based on the principle of gamma ray backscattering, but differs from the usual instrument in that the depth of measurement is only 2.5 cm. This is achieved by using a low energy source, Am 241, with a source to detector distance of 5.5 cm, and a NaI (Tl) detector. The instrument was checked in the field against the method of coring, cutting and weighing, and the root-mean-square difference between the methods was found to be 0.02 g/cc, which is less than 1%.

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References

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Authors and Affiliations

  1. Division of Engineering Sciences, Negev Institute for Arid Zone Research, Beer Sheva, Israel

    K. Preiss

  2. Public Works Department, Ministry of Labor, Tel Aviv, Israel

    D. Nadavia & H. Grossberg

Authors
  1. K. Preiss
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  2. D. Nadavia
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  3. H. Grossberg
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Preiss, K., Nadavia, D. & Grossberg, H. Measurement of the density of the top inch of asphalt paving by gamma radiation. Mat. Constr. 5, 331–334 (1972). https://doi.org/10.1007/BF02474876

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  • DOI: https://doi.org/10.1007/BF02474876

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