Next Article in Journal
Seismic Assessment of RC Bridge Columns Retrofitted with Near-Surface Mounted Shape Memory Alloy Technique
Previous Article in Journal
Marginal Leakage of Endodontic Temporary Restorative Materials around Access Cavities Prepared with Pre-Endodontic Composite Build-Up: An In Vitro Study
Open AccessArticle

Wood Density and Moisture Content Estimation by Drilling Chips Extraction Technique

1
Timber Structures and Wood Technology Research Group, Universidad de Valladolid, 47014 Valladolid, Spain
2
Timber Construction Research Group, UPM, 28040 Madrid, Spain
3
Timber Engineering Research Group, H91HX31 NUI Galway, Ireland
4
Department of Forest and Environmental Engineering and Management, MONTES (School of Forest Engineering and Natural Resources), Universidad Politécnica de Madrid, 28040 Madrid, Spain
*
Author to whom correspondence should be addressed.
Materials 2020, 13(7), 1699; https://doi.org/10.3390/ma13071699
Received: 10 March 2020 / Revised: 1 April 2020 / Accepted: 3 April 2020 / Published: 5 April 2020
The novelty of this study is the development of an accurate wood moisture content (MC) estimation method based on a relatively brand-new, non-destructive testing technique (drilling chips extraction). The method is especially important in the assessment of existing timber structures, where non-destructive testing (NDT) results are affected by wood MC and should be adjusted to a reference MC, usually 12%. In the assessment of timber structures, it is not possible to determine MC by oven drying method and this should be estimated. Electrical resistance and capacitance are the conventional methods used for MC estimation. This research work aims to present an accurate MC estimation method based on the drilling chips extraction technique. For that, 99 specimens (90 × 65 × 38 mm3) from three softwood and hardwood species covering a wide range of densities (from 355 to 978 kg m−3) were tested after conditioning at five different MCs (5%, 10%, 15%, 20%, 25%). The Wood Extractor device based on the drilling chips extraction technique was used. The mass of the chips collected (drilling residue) from each drill was recorded. The results show that the MC of the chips extracted was statistically significantly different than the MC of the specimen and cannot be directly used as MC determination. However, the chips MC can be used as an estimator of specimen MC with high determination coefficients (R2 from 71% to 86%). As the main result, models to estimate density directly adjusted to a reference 12% MC from the wet and dry mass of chips extracted were developed with an R2 of 98%. In sum, the drilling chips extractor is a dependable and straightforward method to estimate MC and density from only one measurement. Density adjusted to a reference 12% MC can be directly estimated from a single model. View Full-Text
Keywords: density estimation; MC adjustment; drilling residue; non-destructive testing; wood extractor; timber structures assessment density estimation; MC adjustment; drilling residue; non-destructive testing; wood extractor; timber structures assessment
Show Figures

Figure 1

MDPI and ACS Style

Martínez, R.D.; Balmori, J.-A.; F. Llana, D.; Bobadilla, I. Wood Density and Moisture Content Estimation by Drilling Chips Extraction Technique. Materials 2020, 13, 1699.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop