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2021
Conference Paper
Titel
Adhesively bonded timber-concrete composites with smooth concrete surfaces
Abstract
The use of prefabricated concrete parts in adhesively bonded timber-concrete composite constructions is advantageous in many ways. The surfaces of the prefabs are commonly prepared by sandblasting and then bonded to the timber part using cold-curing adhesives. Since this process has its limitations, two main innovations are presented in this paper. The first innovation is the use of smooth and unprocessed concrete prefabs and the second is the temperature-controlled curing of the adhesives by heating the bond line locally while the glue hardens. Both innovations are investigated in experimental campaigns, whereby different types of concrete surfaces are combined with several adhesives. The results show clearly that smooth concrete surfaces are suitable for the use in adhesively bonded timber-concrete composite constructions if the combination of adhesive complements the concrete surface and therefore, the most suitable material combinations are identified. In this case, the adhesive bond is strong enough to create a substrate failure in the timber or the concrete rather than an adhesion failure at the surfaces or a cohesion failure in the adhesive itself. It can be seen, that the hot-curing technology is an efficient tool to improve the gluing process.