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Creep properties of heat treated wood in radial direction. - PowerPoint PPT Presentation


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Museu D. Diogo de Sousa, Braga, Portugal, 5-7 November 2008. P arallel session 2 (WG2) Strength of Aged Load Bearing Structures // POSTER N° 8. Creep properties of heat treated wood in radial direction. PhD student Julien COLMARS. Université Montpellier 2 - CNRS

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Museu D. Diogo de Sousa, Braga, Portugal, 5-7 November 2008

Parallel session 2 (WG2) Strength of Aged Load Bearing Structures // POSTER N° 8

Creep properties of heat treated wood in radial direction.

PhD student

Julien COLMARS

Université Montpellier 2 - CNRS

Laboratoire de Mécanique et Génie Civil

Equipe Mécanique de l’Arbre et du Bois

introduction
Introduction

Background:

Heat treatment was used in previous studies as an ‘accelerated ageing’ and showed so far good results on different softwood with respect to the darker color, fragile behavior and the improved stability against humidity changes.

Our objective:

Determine the effect of heat treatment on creep behavior of hardwood, such as Poplar wood, in transverse direction (literature is mainly focused on longitudinal direction). These choices were motivated by our previous work on panel paintings (COST IE0601 Florence 2007).

Host institute & Funding:

This study was conducted in Kyoto University thanks to the Japanese Society for Promotion of Science (JSPS).

material method
Material & Method

Creep tests on Italian Poplar samples

in Radial direction

Thickness 1.6mm

Width 10mm

Length 60mm

No treatment

Heat treatment

(150°C, 24 hours)

Saturated solutions: Relative Humidity 11,22,43,53,62,75,84,92,97% at 24°C

10 days conditioning

Sorption

Isothermes

3 points bending

Creep Tests (10 hours)

At constant humidity (22,62,84,92,97%)

discussion
Discussion

Influence of moisture content in service (even constant mc%) on creep behavior of both treated and untreated poplar.

Chemical modification of wood during heat treatment and its effects on creep properties.

Discussion about post treatment methods for analyzing the results (Time response spectrum, Approximate Complex Plane…).

Special Acknowledgements:

ToMiyuki MATSUO and Misao YOKOYAMA from RISH (Kyoto University) for the discussions about heat treatment. Thanks to Luca UZIELLI for providing the material of this study, and Bertrand MARCON for preparing and deliver it...