Preliminary structural reuse assessment of reclaimed Juniperus excelsa Timber after approximately 42 years of service: Mechanical response, visible defects, and SEM observations

Probably not a substantial claim: may not pass S3 (load-bearing).

The study's SEM observations provide only descriptive microstructural context consistent with mechanisms reported for aged and historic wood, not causal evidence.

“These limited qualitative images cannot establish causality or sample-level correlations; they provide only descriptive microstructural context consistent with mechanisms reported for aged and historic wood (Kránitz et al. 2016;Luimes et al. 2018).”

• cites Kránitz et al. 2016 sourceNot checked — no full text of the source
• cites Luimes et al. 2018 sourceSupported

Probably not a substantial claim: may not pass S3 (load-bearing).

The study's observations are consistent with reuse literature emphasizing member-level evaluation and cautioning against assigning new-wood properties to reclaimed members without grading or non-destructive verification.

“These observations are consistent with the reuse literature, which emphasizes evaluation at the member level and cautions against assigning new-wood properties to reclaimed members without grading or non-destructive verification (Zhang et al. 2015;Pasca et al. 2025;Ranttila et al. 2025).”

• cites Zhang et al. 2015Not matched

  Couldn’t be matched to a paper in Crossref, so it can’t be checked.

• cites Pasca et al. 2025 sourceNot checked — no full text of the source
• cites Ranttila et al. 2025 sourceSupported

Classified as probably not a substantial claim.

Current mechanical properties of old or reclaimed wood remain strongly dependent on species, defects, moisture content, and service history.

“They are also consistent with reviews showing that while the current mechanical properties of old or reclaimed wood may be useful, they remain strongly dependent on species, defects, moisture content, and service history (Cavalli et al. 2016;Novais Passarelli et al. 2025).”

• cites Cavalli et al. 2016 sourceSupported
• cites Novais Passarelli et al. 2025 sourceNot checked — no full text of the source

May combine two claims.

Repeated wetting-drying cycles and long-term loads can lead to microcracks, particularly at cell wall corners and in the middle lamella region, creating stress concentration and reducing energy absorption and stress redistribution capacity.

“Repeated wetting-drying cycles and long-term loads can lead to microcracks, particularly at cell wall corners and in the middle lamella region; these discontinuities can create stress concentration, thereby reducing the material's energy absorption and stress redistribution capacity (Luimes et al. 2018;García-Iruela et al. 2020;Peng et al. 2020;Mi et al. 2023).”

• cites Luimes et al. 2018 sourcePartly supported

  The Experimental results > Load-deflection response section reports that microcracks nucleate and coalesce near peak strength during three-point bending. The paper does not establish that repeated wetting–drying or long-term loads cause microcracks at cell-wall corners or in the middle lamella, or that such cracks reduce energy absorption and stress redistribution capacity. (LLM, conf=0.83)

  Experimental — accuracy not yet measured
• cites García-Iruela et al. 2020 sourceCould not verify

  The Introduction and Conclusions discuss degradation and hygroscopicity, while the Figure 2 caption describes cavities in the secondary cell wall caused by soft rot. Searches for microcracks, wetting–drying cycles, long-term loads, and stress redistribution found no passage addressing the claimed crack locations or mechanical effects. Our copy therefore does not establish this attribution. (LLM, conf=0.76)

  Experimental — accuracy not yet measured
• cites Peng et al. 2020 sourceNot checked — no full text of the source

Classified as probably not a substantial claim.

Reuse decisions require information on current mechanical response, visible and hidden defects, moisture content, and the consequences of an inadequately documented service history.

“Reuse decisions require information on current mechanical response, visible and hidden defects, moisture content, and the consequences of an inadequately documented service history (Pitti et al. 2020;Novais Passarelli et al. 2025;Ranttila et al. 2025).”

• cites Pitti et al. 2020 sourcePartly supported

  The Sourcing, Partnerships, and Production section discusses variable moisture content and detecting embedded metal or other foreign objects; the Weaknesses section also identifies decay as a raw-material concern. These passages support checking moisture and some defects, but they do not address current mechanical response, a distinction between visible and hidden defects, or the consequences of an inadequately documented service history. Page numbers are unavailable in our copy. (LLM, conf=0.87)

  Experimental — accuracy not yet measured
• cites Novais Passarelli et al. 2025 sourceNot checked — no full text of the source
• cites Ranttila et al. 2025 sourceSupported

Probably not a substantial claim: may not pass S3 (load-bearing).

Assessment of reclaimed structural wood is particularly important in regions with high seismic risk, such as Turkey.

“This assessment is particularly important in regions with high seismic risk, such as Turkey (Aktaş 2017).”

• cites Aktaş 2017 sourcePartly supported

  The Conclusions identify Turkey as earthquake-prone and call for improving the seismic performance of existing hımış timber-frame structures. The discussion of material degradation and earthquake damage explains why those structures need attention, but the paper does not address assessing reclaimed structural wood for reuse. (LLM, conf=0.84)

  Experimental — accuracy not yet measured

May combine two claims.

A comparison at a single test date cannot isolate an aging effect or quantify retained capacity without initial measurements.

“Because reclaimed and new specimens can differ in all four of these aspects, a comparison at a single test date cannot isolate an aging effect or quantify retained capacity without initial measurements (Cavalli et al. 2016;Kránitz et al. 2016;Arriaga et al. 2023).”

• cites Cavalli et al. 2016 sourcePartly supported

  The Introduction says unknown initial properties make past-to-present comparison difficult and that natural variability may obscure aging effects. Section 5 recommends measuring a reference property for comparisons across ages and matching new and old wood on key characteristics. The claim overstates this as an absolute inability to isolate aging effects, and the paper does not explicitly address quantifying retained capacity. (LLM, conf=0.83)

  Experimental — accuracy not yet measured
• cites Kránitz et al. 2016 sourceNot checked — no full text of the source
• cites Arriaga et al. 2023Not matched

  Couldn’t be matched to a paper in Crossref, so it can’t be checked.

May combine two claims.

In the new group, MOR tended to decrease with increasing visible defect score, but the subjective indicator and six specimens did not support regression.

“MOR tended to decrease with defect score in the new group, but the subjective indicator and six specimens did not support regression.”

• Also stated in: § Abstract · boosted

  “In the new group, a distinct trend of decreasing bending strength with increasing visible defect scores was evident”

• Also stated in: § CONCLUSIONS · hedged

  “A defect-strength trend appeared in the new group, but subjective scoring and limited reclaimed-group variability prevented broader interpretation.”

May combine two claims.

The average MOR was 21.4 ± 13.3 MPa for the new group and 24.3 ± 8.8 MPa for the reclaimed group.

“the average MOR values for the new and reclaimed groups were 21.4 ± 13.3 and 24.3 ± 8.8 MPa, respectively”

• Also stated in: § CONCLUSIONS · plain

  “average MOR values of 21.4 ± 13.3 MPa for new wood and 24.3 ± 8.8 MPa for reclaimed wood”

May combine two claims.

The average MOEapp was 2432 ± 1178 MPa for the new group and 2566 ± 596 MPa for the reclaimed group.

“The average MOEapp values were 2432 ± 1178 MPa for the new group and 2566 ± 596 MPa for the reclaimed group.”

• Also stated in: § CONCLUSIONS · plain

  “average MOEapp values of 2430 ± 1180 MPa for new wood and 2570 ± 600 MPa for reclaimed wood”

The quote only partly states this claim.

At the test date, the mean compressive strength parallel to grain was 56.1 MPa for the new group and 49.6 MPa for the reclaimed group (n = 3 per group).

“On the test date, the mean compressive strengths parallel to grain were 56.1 MPa for the new group and 49.6 MPa for the reclaimed group”

• Also stated in: § CONCLUSIONS · plain

  “| Parallel to grain | 56.1 | 49.6 |”

The quote only partly states this claim.

At the test date, the mean compressive strength perpendicular to grain was 21.2 MPa for the new group and 15.7 MPa for the reclaimed group (n = 3 per group).

“the corresponding perpendicularto-grain averages were 21.2 and 15.7 MPa, respectively”

• Also stated in: § CONCLUSIONS · plain

  “| Perpendicular to grain | 21.2 | 15.7 |”

May combine two claims.

Reclaimed wood cross-sections contained local microcrack-like discontinuities near cell wall corners and irregularities in intercellular regions, whereas new wood cross-sections exhibited relatively regular cell wall geometry.

“While the cross-sections taken from the new wood exhibited a relatively regular cell wall geometry, the reclaimed sections contained local microcrack-like discontinuities near the cell wall corners and irregularities in the intercellular regions”

May combine two claims.

Longitudinal sections of both groups retained visible fiber continuity; reclaimed wood exhibited a rougher fracture surface.

“The longitudinal sections of both groups retained visible fiber continuity; the reclaimed wood exhibited a rougher fracture surface”

May combine two claims.

Mean density of full-section bending specimens was 556.7 ± 86.5 kg/m3 for new timber and 506.5 ± 40.9 kg/m3 for reclaimed timber.

“Mean density of full-section bending specimens 556.7 ± 86.5 kg/m³ 506.5 ± 40.9 kg/m³”

Probably not a substantial claim: may not pass S3 (load-bearing).

The moisture content of the representative reclaimed wood sample was approximately 4.35% upon arrival.

“The moisture content of the representative sample taken from the reclaimed wood was measured at approximately 4.35% upon arrival.”

May combine two claims.

The compression-parallel-to-grain and full-section bending results for reclaimed and new groups were of the same general order of magnitude, while average perpendicular-to-grain compression values showed a wider divergence.

“The compression-parallel-to-grain and full-section bending results for the reclaimed and new Juniperus excelsa groups were of the same general order of magnitude, while the average perpendicular-to-grain compression values showed a wider divergence.”

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

The new and reclaimed timber groups are similar in species and regional origin but were not considered to have exactly matched initial properties.

“Although the groups are similar in terms of species and regional origin, the materials were not considered to have exactly matched initial properties.”

May combine two claims.

Local microcrack-like discontinuities observed in selected SEM fields were qualitatively consistent with the abrupt fracture behavior, but did not establish causality.

“Local microcrack-like discontinuities observed in selected SEM fields were qualitatively consistent with this behavior but did not establish causality.”

• Also stated in: § CONCLUSIONS · hedged

  “Local microcrack-like features in selected SEM areas were qualitatively consistent with this behavior; however, the limited SEM sampling did not establish causality or a statistical microstructure-mechanical relationship.”

May combine two claims.

The L/h ratio of 7.32 was lower than standardized bending tests (approximately 18 in EN 408); therefore calculated bending properties are test-configuration-specific rather than standard bending properties.

“The resulting spanto-depth ratio, L/h=7.32, was lower than that commonly used for standardized bending tests (approximately 18 in EN 408); therefore, the calculated properties were interpreted as testconfiguration-specific values rather than standard bending properties.”

• cites EN 408Not matched

  Couldn’t be matched to a paper in Crossref, so it can’t be checked.

May combine two claims.

Crosshead displacement was used without independent mid-span measurement; therefore MOEapp includes machine, contact, shear, and bending deformations and is not a pure material modulus.

“Crosshead displacement was used without independent mid-span measurement; therefore, MOEapp includes machine, contact, shear, and bending deformations and is not a pure material modulus.”

May combine two claims.

The short-span, crosshead-based MOR and MOEapp values are not design properties; they are setup-specific apparent values rather than standard material properties.

“These short-span, crossheadbased values are not design properties”

• Also stated in: § Bending Strength and Apparent Stiffness · plain

  “These short-span, crosshead-based values include shear, contact, and machine flexibility and therefore represent setup-specific apparent stiffness rather than a pure flexural modulus.”

• Also stated in: § Four-Point Bending Tests · plain

  “the calculated properties were interpreted as testconfiguration-specific values rather than standard bending properties.”

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

The defect-score comparison was exploratory and was not used as a predictive regression model.

“The defect-score comparison was exploratory and was not used as a predictive regression model.”

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

The bending test rates (2, 5, and 10 mm/min) were not independently replicated, so they were treated as uncertainty rather than an experimental variable, and no rate effect was inferred.

“Because rates were not independently replicated, they were treated as uncertainty rather than an experimental variable, and no rate effect was inferred.”

Probably not a substantial claim: may not pass S3 (load-bearing).

Studies on aged wood demonstrate that microstructural observations cannot be generalized without systematic sampling.

“Studies on aged wood also demonstrate that microstructural observations cannot be generalized without systematic sampling (Xin et al. 2022;Zhang et al. 2024).”

• cites Xin et al. 2022 sourceNot checked — no full text of the source
• cites Zhang et al. 2024Not matched

  Couldn’t be matched to a paper in Crossref, so it can’t be checked.

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

Juniperus excelsa is rich in extractives and possesses natural durability that is used in traditional structures in Turkey.

“This distinction is particularly important for Juniperus excelsa, a species rich in extractives and possessing natural durability that is used in traditional structures in Turkey (Atas et al. 2012;Sarangzai et al. 2012;Yücedağ et al. 2021).”

• cites Atas et al. 2012 sourceNot checked — no full text of the source
• cites Sarangzai et al. 2012Not matched

  Couldn’t be matched to a paper in Crossref, so it can’t be checked.

• cites Yücedağ et al. 2021 sourceNot checked — no full text of the source

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

Natural fiber orientation was visually checked; radial and tangential directions were not systematically separated.

“Natural fiber orientation was visually checked; radial and tangential directions were not systematically separated.”

May combine two claims.

The study's limitations (small sample sizes, single species and source, unknown histories, unmatched defects, study-specific scoring, three bending rates, short span, crosshead displacement, missing post-peak records, qualitative SEM) preclude determination of confidence intervals, reliability calibration, or attribution of group differences solely to aging.

“These factors preclude the determination of confidence intervals, reliability calibration, or the attribution of group differences solely to aging.”

Probably not a substantial claim: may not pass S2 (checkable).

Average values alone are insufficient for reuse decisions.

“average values alone are insufficient for reuse decisions.”

Probably not a substantial claim: may not pass S2 (checkable).

Similar-looking average values should not be taken to imply equivalence with new wood.

“similar-looking average values should not be taken to imply equivalence with new wood.”

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

The reported perpendicular-to-grain compression value was identified from archived records as the onset of a distinct crushing/yielding response, but the exact offset-based criterion could not be reconstructed retrospectively.

“The archived records identified the reported perpendicular-tograin value as the onset of a distinct crushing/yielding response; however, the exact offsetbased criterion could not be reconstructed retrospectively.”

Classified as probably not a substantial claim.

The larger numerical discrepancy in perpendicular-to-grain compression points to bearing and support regions as a practical focus for future element-level evaluation.

“the larger numerical discrepancy in the direction perpendicular to the grains points to the bearing and support regions as a practical focus for future element-level evaluation”

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

The compression results are reported as group averages; because individual values are not available, no statistics on variation can be provided.

“The compression results are reported as group averages; Because individual values are not available, no statistics on variation can be provided.”

May combine two claims.

Because initial properties and individual values are unavailable, the observed differences cannot be attributed to age or service exposure or tested statistically.

“Because initial properties and individual values are unavailable, these differences cannot be attributed to age or service exposure or tested statistically.”

• Also stated in: § Abstract · plain

  “These differences were not interpreted as a loss or preservation of properties, as the initial properties and detailed service history of the reclaimed specimens are unknown.”

• Also stated in: § CONCLUSIONS · plain

  “Because the initial properties are unknown, these observations did not quantify either the retention of strength or age-related loss.”

May combine two claims.

The average MOR and MOEapp values do not indicate equivalence, improvement, loss, or preservation; they merely characterize the tested specimens at a single point in time.

“Therefore, the averages do not indicate equivalence, improvement, loss, or preservation; they merely characterize the tested specimens at a single point in time.”

• Also stated in: § CONCLUSIONS · plain

  “similar group averages do not demonstrate equivalence or improvement, particularly given the influence of NJ-5.”

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

Long-term environmental exposure can affect the constituents of wood's multiphase structure in different ways; hemicellulose is generally more susceptible to moisture-related degradation, whereas the cellulose-lignin framework may remain comparatively more stable.

“Long-term environmental exposure can affect the constituents of wood's multiphase structure in different ways.Hemicellulose is generally more susceptible to moisture-related degradation, whereas the cellulose-lignin framework may remain comparatively more stable, depending on species and exposure history (Kránitz et al. 2016;Wang et al. 2021;Xin et al. 2022).”

• cites Kránitz et al. 2016 sourceNot checked — no full text of the source
• cites Wang et al. 2021Not matched

  Couldn’t be matched to a paper in Crossref, so it can’t be checked.

• cites Xin et al. 2022 sourceNot checked — no full text of the source

May combine two claims.

Heartwood and sapwood were not separated or quantified; therefore the results do not represent heartwood-only properties.

“Heartwood and sapwood were not separated or quantified; therefore, the results do not represent heartwood-only properties.”

May combine two claims.

Both groups exhibited heterogeneous responses, and the small data set does not support a general claim that all reclaimed wood is less ductile.

“However, both groups exhibited heterogeneous responses, and the small data set does not support a general claim that all reclaimed wood is less ductile.”

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

Original lumber preparation and in-service dimensions were not documented; however, both groups used the same nominal geometry within each test series.

“Original lumber preparation and in-service dimensions were not documented; however, both groups used the same nominal geometry within each test series.”

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

The study-specific visual defect scoring was not calibrated against recognized visual grading standards and is subjective; this is a limitation.

“These categories were not calibrated against recognized visual grading standards and do not represent pass/fail classes; they were used solely as a study-specific indicator for exploratory comparisons within the dataset.”

• Also stated in: § Visual Defect Indicator · plain

  “This subjectivity is a limitation of the study.”

Classified as probably not a substantial claim.

Previous old-versus-new studies on juniper and other structural species have shown that long-term service effects vary with species, defects, density, moisture history, and exposure conditions.

“Previous old-versus-new studies on juniper and other structural species have shown that long-term service effects vary with species, defects, density, moisture history, and exposure conditions (Bektas et al. 2004;Sonderegger et al. 2015).”

• cites Bektas et al. 2004Not matched

  Couldn’t be matched to a paper in Crossref, so it can’t be checked.

• cites Sonderegger et al. 2015 sourceNot checked — no full text of the source

May combine two claims.

Shear and the flexibility of the test system contribute to the measured displacement; stiffness is reported as apparent MOE rather than pure modulus.

“Consequently, shear and the flexibility of the test system contribute to the measured displacement; stiffness is reported as the apparent modulus of elasticity (MOEapp) rather than the pure modulus of elasticity.”

Probably not a substantial claim: may not pass S3 (load-bearing).

Previous studies have demonstrated the potential of CFRP-based techniques for strengthening damaged or aged timber beams under different loading conditions.

“Previous studies have demonstrated the potential of CFRP-based techniques for strengthening damaged or aged timber beams under different loading conditions (Türer et al. 2024;Alaşalvar et al. 2025).”

• cites Türer et al. 2024Not matched

  Couldn’t be matched to a paper in Crossref, so it can’t be checked.

• cites Alaşalvar et al. 2025 sourceNot checked — no full text of the source

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

SEM sampling was not systematic, and no quantitative crack density measurements or statistical correlations with mechanical response were performed; SEM images were treated solely as qualitative observations.

“Sampling was not systematic; no quantitative crack density measurements were performed, nor were any statistical correlations established with mechanical response.”

• Also stated in: § SEM Examination and Data Evaluation · plain

  “SEM images were therefore treated solely as qualitative observations based on a limited field of view.”

Probably not a substantial claim: may not pass S3 (load-bearing).

Post-peak behavior was assessed qualitatively because no ductility or fracture-energy parameter was defined.

“post-peak behavior was assessed qualitatively because no ductility or fracture-energy parameter was defined.”

Probably not a substantial claim: may not pass S3 (load-bearing).

All mechanical test specimens were conditioned for more than five months prior to testing under 20 ± 2 °C and 65 ± 5% relative humidity.

“All mechanical test specimens were conditioned for more than five months prior to testing under conditions of 20 ± 2 °C and 65 ± 5% relative humidity”

May combine two claims.

The cube dimensions adapted ASTM D143-22 and TS 2470 procedures to limited clear lengths; therefore, compression results are comparative rather than standard strength values.

“The cube dimensions adapted ASTM D143-22 (2022) and TS 2470 (1976) procedures to the limited clear lengths; therefore, the results are comparative rather than standard strength values.”

• cites ASTM D143-22 (2022)Not matched

  Couldn’t be matched to a paper in Crossref, so it can’t be checked.

• cites TS 2470 (1976)Not matched

  Couldn’t be matched to a paper in Crossref, so it can’t be checked.

Probably not a substantial claim: may not pass S2 (checkable), S4 (based).

The current mechanical condition of reclaimed timber should first be established before any strengthening or structural reuse strategy is selected.

“However, the current mechanical condition of reclaimed timber should first be established before any strengthening or structural reuse strategy is selected.”

Probably not a substantial claim: may not pass S2 (checkable).

The perpendicular-to-grain compression result should be interpreted not as a design reduction factor, but as a preliminary engineering indicator.

“Therefore, the result should be interpreted not as a design reduction factor, but as a preliminary engineering indicator.”

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

Similar local variations have been reported in studies of naturally aged wood; however, their occurrence and mechanical significance depend on species, exposure, sampling location, and preparation method.

“Similar local variations have been reported in studies of naturally aged wood; however, their occurrence and mechanical significance depend on species, exposure, sampling location, and preparation method (Xin et al. 2022;Zhang et al. 2024).”

• cites Xin et al. 2022 sourceNot checked — no full text of the source
• cites Zhang et al. 2024Not matched

  Couldn’t be matched to a paper in Crossref, so it can’t be checked.