On-Site X-ray Assessment of Density in Timber Structures
Conference poster, 2011

On-site determination of density properties of timber structures allows evaluation of the internal condition. The X-ray calibration procedure showed a very good agreement between the measured density and the grayscale from X-ray images and indicates a good opportunity for developing a useful tool for the overall assessment of timber structures. The correlation coefficients (R2) range from 0.90-0.98. There can also be detected a clear tendency between the influence of different moisture conditions and the grayscale from X-ray images. This influence must be therefore concluded in the evaluation process as well as the influence of the thickness of the timber specimen. The density calibration method was verified on wood specimens with highly acceptable results and an average accuracy of 97%. Besides the possibility of determining mechanical properties of timber, the main advantage over conventional techniques is the detection and quantification of internal damage, defects and deterioration that reduce the mechanical properties of the structure.


digital radiography

in-situ assessment


non-destructive testing (NDT)

digital image processing

timber structures


Thomas Kruglowa

Chalmers, Civil and Environmental Engineering, Structural Engineering

Robert Kliger

Chalmers, Civil and Environmental Engineering, Structural Engineering

Proceedings of the International Conference on Structural Health Assessment of Timber Structures 2011 (SHATIS 2011)

Areas of Advance

Building Futures (2010-2018)

Subject Categories

Civil Engineering

Building Technologies

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