WOOD RESEARCH Volume 67, Number 2, 2022
EUN-SUK JANG and Chun-Won Kang

The relationship between bulk density and thermal conductivity in various korean woods

The article deals with the effects of bulk density on thermal conductivity in specimens of 15 Korean woods (Zelkova serrata, Pinus densiflora, Cornus controversa, Betula schmidtii, Betula platyphylla var. japonica, Ginkgo biloba L., Cedrela sinensis A. Juss., Fraxinus mandshurica, Ulmus davidiana var. japonica, Prunus sargentii Rehder, Paulownia tomentosa (Thunb.) Steud., Larix kaempferi (Lamb.) Carrière, Robinia pseudoacacia, Kalopanax septemlobus and Tilia amurensis). The results of this study were compared with previous studies performed on wood specimens from China, India, and Turkey. Consistent with these previous studies, bulk density and thermal conductivity were positively correlated in Korean woods, and a simple regression model with a very high correlation of R2 (94%) was obtained. Interestingly, we observed some variation between our simple regression models and those generated by previous researchers who had examined non-Korean woods.

WOOD RESEARCH Volume 64, Number 6, 2019
Zoltán Pásztory, ZOLTÁN BÖRCSÖK, Peter Adamik, and Dimitrios Tsalagkas

Internal fiberglass mesh reinforced bark-based panels

One-layer bark panels were internally reinforced with two different grid sizes fiberglass mesh sheets (M1 and M2). The thermal conductivity, water absorption, thickness swelling, static bending properties and internal bond strength of these panels were tested. The reinforcement doesn’t affect the thermal conductivity, but the physical and mechanical properties of the panel were improved. The thickness swelling was reduced by 7.43% and 12.93%; the water uptake decreased by 4.93% and 16.32% for the M1 and M2 sheets, respectively. MOR increased from 0.54 MPa to 2.44 and 2.1 MPa, and MOE increased from 0.28 GPa to 0.66 and 0.63 GPa, respectively. The internal bond didn’t change. The findings indicate that it is possible to produce internal reinforced bark panels for insulation materials depending on the characteristics and tensile properties of the reinforcing materials, as well as the adhesion properties and interfacial interaction of the composite materials.

WOOD RESEARCH Volume 65, Number 3, 2020
Esra Celik, Ismail Cengiz Yilmaz, and Deniz Yilmaz

An experimental study on sustainability of historical wooden buildings exposed to open sea streams

This research deals with the impact of the microclimate on historical wooden buildings exposed to open sea streams. The Florya Ataturk Marine Mansion in Istanbul, erected on the sea, totally defenceless to weather and sea effects, has been selected as representative case study for many other buildings located in Bosphorus line. In order to address the effect of the environment on the building exposed to open sea streams microclimatic data were collected for one year. The synergistic effect of the sea-salt aerosol and microclimatic conditions were discussed for the assessment of the impact of the marine environment on the durability of the Mansion, identifying the more vulnerable parts of the building as well as the more critical periods. The results indicate that while moisture content changes from 20.9% to 36.7% and temperature changes from 14.1°C to 28.7°C, thermal conductivity coefficient changes from 0.18 W.m-1K-1 to 0.26 W.m-1K-1, according to the facade of the building and the season as similar to previous studies.