Controlled Temperature Natural Weathering

2008 ◽  
pp. 93-114 ◽  
Author(s):  
Anthony Buxton ◽  
Jon A. Graystone ◽  
Richard Holman ◽  
Francesco Macchi
Keyword(s):  
Natural Weathering

Natural weathering studies of biobased thermoplastic starch from agricultural waste/polypropylene blends

2013 ◽  
Vol 129 (6) ◽  
pp. 3237-3246 ◽  
Author(s):  
Ming-Meng Pang ◽  
Meng-Yan Pun ◽  
Zainal Arifin Mohd. Ishak
Keyword(s):  
Agricultural Waste ◽  
Thermoplastic Starch ◽  
Natural Weathering ◽  
Polypropylene Blends ◽  
Waste Polypropylene

scholarly journals Bioinspired Living Coating System in Service: Evaluation of the Wood Protected with Biofinish during One-Year Natural Weathering

Coatings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 701
Author(s):  
Faksawat Poohphajai ◽  
Jakub Sandak ◽  
Michael Sailer ◽  
Lauri Rautkari ◽  
Tiina Belt ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Scots Pine ◽  
Critical Factor ◽  
Climatic Conditions ◽  
Natural Weathering ◽  
Surface Finishing ◽  
Attractive Alternative ◽  
Coating System ◽  
Self Healing ◽  
Wood Protection

The service life performance of timber products exposed to natural weathering is a critical factor limiting the broad use of wood as an external building element. The goal of this study was to investigate the in-service characterization of an innovative biofinish coating system. It is a novel surface finishing solution based on the bioinspired concept of living fungal cells designed for effective wood protection. The performance of Scots pine (Pinus sylvestris L.) wood coated with biofinish was compared with uncoated references. Samples were exposed to natural weathering for 12 months under the climatic conditions of northern Italy. The visual appearance, colour, gloss, wettability, and 3D surface topography of the wood surface were examined. Results revealed that the total colour changes (∆E) of biofinish-coated wood were negligible. Untreated Scots pine wood revealed the changes in colour after just three months of exposure. The gloss changes of both surface types were small. The contact angle measured on biofinish-coated wood was higher compared to that of uncoated Scots pine. Surface roughness increased in uncoated wood due to the erosion effect caused by the weathering progress. Conversely, the surface roughness of biofinish-coated samples decreased along the exposure time. This phenomenon was explained by two self-healing mechanisms: migration of non-polymerized oil to the cracked surface, where it polymerizes and creates a closed layer, and local regrowth to cover damaged spots by living fungal cells present in the coating. The obtained results revealed the superior aesthetic performance of the biofinish surface treatment against natural weathering. By considering the fully bio-based nature of the investigated coating, it was concluded that this solution can be an attractive alternative for state-of-the-art wood protection technologies.

Comparison of wood coating durability in natural weathering and artificial weathering using fluorescent UV-lamps and water

2014 ◽  
Vol 72 (3) ◽  
pp. 367-376 ◽  
Author(s):  
Gerhard Grüll ◽  
Florian Tscherne ◽  
Irene Spitaler ◽  
Boris Forsthuber
Keyword(s):  
Natural Weathering ◽  
Wood Coating ◽  
Artificial Weathering ◽  
Coating Durability ◽  
Uv Lamps

Modelling the Moisture Induced Risk of Decay for Treated and Untreated Wood Above Ground

Holzforschung ◽  
2000 ◽  
Vol 54 (2) ◽  
pp. 111-118 ◽  
Author(s):  
A. O. Rapp ◽  
R.-D. Peek ◽  
M. Sailer
Keyword(s):  
Moisture Content ◽  
Untreated Wood ◽  
Natural Weathering ◽  
Test Material ◽  
Ground Contact ◽  
Mathematical Relationship ◽  
Durability Prediction ◽  
Laboratory Investigations ◽  
Second Year ◽  
Moisture Vapour

Summary During two years of natural weathering the course of the moisture content of test samples of pine sapwood (Pinus sylvestris L.), Norway spruce (Picea abies L.), oak heartwood (Quercus robur L.) and Douglas fir heartwood (Pseudotsuga menziesii Franco.) was recorded by means of 12,000 individual gravimetric readings. The samples were untreated, treated with a weather protection varnish, or impregnated with melamine resin. The data were evaluated with regard to the number of days per year on which the moisture content of wood exceeded the limit of 25%. From the results of subsequent laboratory investigations into the adsorption of liquid water and moisture vapour desorption using the same test material, it was possible to work out a mathematical relationship (MRI = moisture induced risk index) which correlates closely with the number of days of more than 25% moisture content during the second year of natural weathering. The MRI is proposed as a parameter for the assessment of the protective effect of wood treatments which are intended to reduce moisture content and also for durability prediction of untreated wood in out of ground contact situations.

scholarly journals Fire Retardancy of Fire-retardant-impregnated Wood after Natural Weathering I.

2018 ◽  
Vol 64 (3) ◽  
pp. 105-114 ◽  
Author(s):  
Masayuki Kawarasaki ◽  
Ryoichi Hiradate ◽  
Yasushi Hirabayashi ◽  
Shinichi Kikuchi ◽  
Yoshifumi Ohmiya ◽  
...  
Keyword(s):  
Fire Retardant ◽  
Natural Weathering ◽  
Fire Retardancy ◽  
Impregnated Wood

scholarly journals Influence of Natural and Artificial Weathering on the Colour Change of Different Wood and Wood-Based Materials

Forests ◽  
2018 ◽  
Vol 9 (8) ◽  
pp. 488 ◽  
Author(s):  
Davor Kržišnik ◽  
Boštjan Lesar ◽  
Nejc Thaler ◽  
Miha Humar
Keyword(s):  
Laboratory Test ◽  
Colour Change ◽  
Natural Weathering ◽  
Blue Staining ◽  
Artificial Weathering ◽  
Blue Stain Fungi ◽  
Colour Changes ◽  
Blue Stain ◽  
Positive Correlations ◽  
The Aesthetic

The importance of the aesthetic performance of wood is increasing and the colour is one of the most important parameters of aesthetics, hence the colour stability of twelve different wood-based materials was evaluated by several in-service and laboratory tests. The wood used for wooden façades and decking belongs to a group of severely exposed surfaces. Discolouration of wood in such applications is a long-known phenomenon, which is a result of different biotic and abiotic causes. The ongoing in-service trial started in October 2013, whilst a laboratory test mimicking seasonal exposure was performed in parallel. Samples were exposed to blue stain fungi (Aureobasidium pullulans and Dothichiza pithyophila) in a laboratory test according to the EN 152 procedure. Afterwards, the same samples were artificially weathered and re-exposed to the same blue stain fungi for the second time. The purpose of this experiment was to investigate the synergistic effect of weathering and staining. The broader aim of the study was to determine the correlation factors between artificial and natural weathering and to compare laboratory and field test data of fungal disfigurement of various bio-based materials. During the four years of exposure, the most prominent colour changes were determined on decking. Respective changes on the façade elements were significantly less prominent, being the lest evident on the south and east façade. The results showed that there are positive correlations between natural weathering and the combination of artificial weathering and blue staining. Hence, the artificial weathering of wood-based materials in the laboratory should consist of two steps, blue staining and artificial weathering, in order to simulate colour changes.

scholarly journals Combustibility of fire-retardant impregnated and surface-coated wood after 5 years of natural weathering

2017 ◽  
Vol 43 (6) ◽  
pp. 322-327
Author(s):  
Toshiro HARADA ◽  
Daisuke KAMIKAWA ◽  
Yutaka KATAOKA ◽  
Atsuko ISHIKAWA ◽  
Yuji KAMEOKA
Keyword(s):  
Fire Retardant ◽  
Natural Weathering
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