To reduce global CO2 emissions, investigations are carried out on alternative construction methods that can compete economically with conventional reinforced concrete construction. Besides the development of high-performance building materials, the combination of different materials, as well as the prefabrication of building elements, also help to reduce emissions. In timber-concrete composite (TCC) constructions the available materials are sensibly used in the component cross-section according to their performance. They have been mainly used in ceiling structures subject to bending stresses. In this paper,
a yet unexplored application of TCC for the connection of wall elements made of cross-laminated timber is presented. The idea is to connect the prefabricated timber elements in the tongue-and-groove system on-site via shear joints with grouting mortar and additional internal connectors, thus transferring the shear load of the connected timber walls through the hardened grout. Therefore experimental investigations are carried out, in which different design variants of the cross-laminated timber wall connection in TCC construction were tested with regard to their load-bearing capacity. More specifically, proven steel connectors (screws and perforated plates) or bird mouths were inserted into the front side of the timber wall elements and the joints were grouted. To withstand tensile stresses in the concrete, textile reinforcement and/or fiber concrete were used in large-scale component tests. As a result, a preferred and more rigid variant compared to the classic pre-nailed joint cover strips is chosen to extend the application of timber construction in the building industry for higher stress conditions by using TCC.