Kostić Sanja, Meier Sandro, Cabane Etienne, Burgert Ingo
Wood Materials Science, ETH Zürich, Stefano-Franscini-Platz 3, CH-8093 Zürich, Switzerland.
Applied Wood Materials, EMPA - Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland.
Heliyon. 2018 Sep 7;4(9):e00762. doi: 10.1016/j.heliyon.2018.e00762. eCollection 2018 Sep.
Timber-concrete composites require reliable connections between both components, which are usually obtained by metal fasteners or slots in the wood. In this study, an alternative approach is presented based on a fully glued connection in combination with a primer treated wood surface, to enhance the compatibility and the adhesion properties at the interface between beech wood and concrete. Prior to the gluing and the concrete application in a wet-on-wet process, the wood surface was functionalised with a xerogel obtained by means of a sol-gel process, consisting of two layers of silane nanofilms, with different functional groups, which are capable of undergoing further chemical crosslinking reactions with the adhesive. The coating with its functionalities allows for reducing the penetration of the epoxy adhesives into the wood structure and an additional chemical connection to the adhesive can be established. The main objective of this study was to analyse the effect of the surface treatment on the mechanical properties of such composites in 3-point and 4-point bending tests as well as push-out-tests. The results showed that the pre-treatment can improve the load bearing capacity of the timber-concrete composites, but that a ductile behaviour cannot be achieved with the tested adhesives.
木材-混凝土复合材料需要两种组分之间可靠的连接，通常通过金属紧固件或木材中的槽口来实现。在本研究中，提出了一种基于完全胶合连接并结合底漆处理木材表面的替代方法，以增强山毛榉木材与混凝土界面处的相容性和粘附性能。在湿碰湿工艺中进行胶合和施加混凝土之前，木材表面用通过溶胶-凝胶工艺获得的干凝胶进行功能化处理，该干凝胶由两层具有不同官能团的硅烷纳米膜组成，这些官能团能够与粘合剂发生进一步的化学交联反应。具有这些功能的涂层能够减少环氧粘合剂渗入木材结构，并且可以与粘合剂建立额外的化学连接。本研究的主要目的是在三点和四点弯曲试验以及推出试验中分析表面处理对这种复合材料力学性能的影响。结果表明，预处理可以提高木材-混凝土复合材料的承载能力，但使用测试的粘合剂无法实现延性行为。
