Evaluation of the internal defaults and decay in old timber in building using non-destructive ground penetration radar (GPR) method

Madhoushi, Mehrab; Hatefnia, Hamid

doi:10.22092/ijwpr.2022.357593.1709

Document Type : Research Paper

Authors

Mehrab Madhoushi ¹
Hamid Hatefnia ²

¹ Associate Professor, Department of Wood Engineering and Technology, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran

² PhD, Wood Composites, Department of Wood Engineering and Technology, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran

https://doi.org/10.22092/ijwpr.2022.357593.1709

Abstract

In this study, ground penetration radar (GPR) was used to assess the internal defects and decay of structural old timber in buildings and compare it with the sound wood. For this purpose, twelve samples of three wood species of beech, oak and yew with dimensions of 120 × 60 × 400 mm, and as flat sawn were selected. Two samples from beech species with severe decay and two samples from oak species with mild decay were selected from old buildings. Sound and completely dry samples of these species (two samples from each species) were also obtained from forest trees as an indicator. Four yew samples without decay were selected only from the old buildings. Holes with a diameter of 2 and 8 mm were drilled in decayed and also two yew samples. The samples were scanned perpendicular to the fibers direction using a HF antenna of 2.3 GHz. The condition of data collection and processing were the same for all samples. After the initial data collection, in order to increase the resolution and better interpretation of the image, different filtration process was applied using image processing software Reflexw. The results showed that the relative dielectric coefficient was higher in decayed wood, and due to the difference in reflection coefficient between sound and decayed wood, they can be distinguished from each other. It was also possible to detect holes of 8 mm in oak and yew species.

Keywords

20.1001.1.17350913.1401.37.3.2.1

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Iranian Journal of Wood and Paper Science Research

Evaluation of the internal defaults and decay in old timber in building using non-destructive ground penetration radar (GPR) method

References

References

Volume 37, Issue 3 - Serial Number 80
September 2022
Pages 217-228

Evaluation of the internal defaults and decay in old timber in building using non-destructive ground penetration radar (GPR) method

References

References

Volume 37, Issue 3 - Serial Number 80September 2022Pages 217-228

Volume 37, Issue 3 - Serial Number 80
September 2022
Pages 217-228