University of Natural Resources and Life Sciences, Vienna (BOKU) - Research portal
Gewählte Doctoral Thesis:
Stephan Michael Frybort
(2012):
Untersuchung des Anbindeverhaltens des Holzes im Holz-Zementverbund.
Doctoral Thesis - Institut für Holzforschung (IHF),
BOKU-Universität für Bodenkultur,
pp 145.
UB BOKU
obvsg
- Abstract:
- Cement bonded wood composites are popular and well tried products in the construction industry. Although performance of wood cement bonding is proven by long time experience, studies examining bonding behaviour are missing. To examine bonding behaviour between wood and cement the pull-out test was adapted to the needs of cement bonded wood composites. Thereby not only compatibility between wood and cement but also the influence of particle geometry can be analysed. The examinations showed a significant influence of swelling and shrinking behaviour of wood as well as of the surface roughness on bonding strength. Rough surfaces exhibit a higher specific surface area and most notably anchor points which increase mechanical adhesion. Due to the comparably increased swelling of thicker particles as well as the increased water uptake, thick particles are less suitable for the production of cement bonded composites. Bonding between the less rough surface of the wood particle and cement fails already during curing of the cement stone. Thereby only a reduced bonding area is able to transfer load between the wood particle and the cement matrix. Based on the results an attempt was made to identify the ideal strand thickness concerning optimal load transfer between reinforcement and matrix material. Due to a decrease of bond strength on increasing strand thicknesses and a decrease of tensile strength of wood along the grain on thicknesses below 300 µm, an ideal strand thickness of 100 – 200 µm was identified.
- Betreuer: Teischinger Alfred
- 1. Berater: Müller Ulrich
- 2. Berater: Hinterstoisser Barbara