A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Grading of recovered Norway spruce (Picea abies) timber for structural purposes
Highlights Recovered timber from demolition is a reliable structural material. Visual strength grading standards do not properly grade recovered timber. Longitudinal vibration accurately estimates mechanical properties. Non-destructive probing methods allow accurate prediction of recovered timber density.
Abstract An increasing amount of timber is recovered from demolition and can be value-added through reuse or recycling for structural applications. This study investigates the possibilities of using visual and non-destructive parameters to estimate the mechanical properties of recovered timber so that it can be graded for new applications. A batch of nineteen recovered Norway spruce (Picea abies (L.) Karst.) rafters was studied. The application of two visual grading standards produced a rejection of 95% of the specimens. Estimation of modulus of elasticity was performed using ultrasound and vibration NDT techniques, with determination coefficients (R2) of 0.66 and 0.75 respectively. In the case of bending strength estimation, R2 were 0.60 and 0.77 respectively. Visual knottiness parameter was only a statistically significant variable in the estimation model of local modulus of elasticity. Density was estimated using drilling chips extraction and drilling penetration resistance with R2 of 0.66 and 0.58 respectively.
Grading of recovered Norway spruce (Picea abies) timber for structural purposes
Highlights Recovered timber from demolition is a reliable structural material. Visual strength grading standards do not properly grade recovered timber. Longitudinal vibration accurately estimates mechanical properties. Non-destructive probing methods allow accurate prediction of recovered timber density.
Abstract An increasing amount of timber is recovered from demolition and can be value-added through reuse or recycling for structural applications. This study investigates the possibilities of using visual and non-destructive parameters to estimate the mechanical properties of recovered timber so that it can be graded for new applications. A batch of nineteen recovered Norway spruce (Picea abies (L.) Karst.) rafters was studied. The application of two visual grading standards produced a rejection of 95% of the specimens. Estimation of modulus of elasticity was performed using ultrasound and vibration NDT techniques, with determination coefficients (R2) of 0.66 and 0.75 respectively. In the case of bending strength estimation, R2 were 0.60 and 0.77 respectively. Visual knottiness parameter was only a statistically significant variable in the estimation model of local modulus of elasticity. Density was estimated using drilling chips extraction and drilling penetration resistance with R2 of 0.66 and 0.58 respectively.
Grading of recovered Norway spruce (Picea abies) timber for structural purposes
Llana, Daniel F. (author) / Íñiguez-González, Guillermo (author) / Plos, Mitja (author) / Turk, Goran (author)
2023-07-05
Article (Journal)
Electronic Resource
English
Modeling the longitudinal variation of sawn timber grades in Norway spruce (Picea abies (L.) Karst.)
| British Library Online Contents | 2008
Thermochemical behaviour of Norway spruce (Picea abies) at 180-225^oC
| British Library Online Contents | 2002
| DOAJ | 2024
| British Library Online Contents | 2009