CLT Made of Hungarian Indigenous Poplar Material

Shema, Fabrice (2026) CLT Made of Hungarian Indigenous Poplar Material. MA/MSc, Faipari Mérnöki és Kreatívipari Kar (2013-tól 2021.06.30-ig: Simonyi Károly Műszaki, Faanyagtudományi és Művészeti Kar).

PDF FMK-2-2026-D.pdf Hozzáférés joga: Csak nyilvántartásba vett egyetemi IP-kről nyitható meg Download (8MB)

Absztrakt (kivonat)

The increasing demand for sustainable, low‑carbon construction materials has intensified interest in expanding the raw‑material base for cross‑laminated timber (CLT) beyond traditional softwoods. In Hungary, where forests are dominated by hardwoods and indigenous poplar resources are expanding; there is a growing need to evaluate native species as viable alternatives to hybrid poplars and imported softwoods. This study investigates the structural feasibility of manufacturing CLT panels from indigenous Hungarian grey poplar (Populus × canescens), a climate‑resilient but currently underutilised species. Two three‑layer CLT panels were produced under controlled laboratory conditions using 1C‑PUR structural adhesive, and mechanically graded lamellas (C14–C45). Specimens were conditioned at 20°C and 65% RH and tested for moisture content, density, screw withdrawal resistance (SWR), modulus of rupture (MOR), and modulus of elasticity (MOE) according to EN standards. Density values ranged from 363–495 kg/m³ (mean ≈ 430 kg/m³), aligning with published ranges for indigenous poplar and playing a clear role in mechanical performance. Four‑point bending tests yielded a mean MOR of 46.61 MPa, exceeding the baseline requirements for commercial softwood CLT and closely matching the spruce–spruce–spruce reference configuration (45.2 MPa) reported in comparable Hungarian studies. Mean MOE was 8.63 GPa, meeting strength‑governed structural requirements but falling below thresholds typically applied to deflection‑governed elements and below the stiffness of hybrid‑poplar PPP panels (12.54 GPa). SWR tests recorded a mean withdrawal force of 1,175 N, consistent with the species’ moderate density; results were converted to an 18 mm‑equivalent embedment length for direct comparison with Garab et al. (2026). Across benchmarks, indigenous grey poplar demonstrated bending strength comparable to softwood CLT but consistently lower stiffness and connection capacity. Overall, the findings confirm that indigenous Hungarian poplar is structurally viable for CLT production, particularly for applications where deflection limits are not governing. Given its climate resilience, expanding forest area, and low current utilisation, grey poplar represents a promising, locally sustainable raw material for Hungary’s evolving mass‑timber sector.

Angol cím

CLT Made of Hungarian Indigenous Poplar Material

Intézmény

Soproni Egyetem

Kar

Faipari Mérnöki és Kreatívipari Kar (2013-tól 2021.06.30-ig: Simonyi Károly Műszaki, Faanyagtudományi és Művészeti Kar)

Tanszékcsoport/intézet

FMK - Alkalmazott Tudományi Intézet

Szak

NEM RÉSZLETEZETT

Témavezető(k)

Helyi kari azonosító

FMK-2-2026-D

Mű típusa:	Diplomadolgozat (MA/MSc)
Felhasználói azonosító szám (ID):	Fabrice Shema
Dátum:	18 Máj 2026 09:52
Utolsó módosítás:	18 Máj 2026 09:52
URI:	http://diploma.uni-sopron.hu/id/eprint/17481

Actions (login required)

Tétel nézet