PUSH-OUT TESTS OF WET-PROCESS ADHESIVE-BONDED BEECH TIMBER-CONCRETE AND TIMBER-POLYMER-CONCRETE COMPOSITE CONNECTIONS

For timber-concrete composite (TCC) elements, a stiff and rigid connection results in an enhanced shear stress transfer at the timber-concrete interface, and thus, reduces the necessary cross-section height.A full composite action can hypothetically be achieved using an adhesive connection.In this study, an adhesive system developed for a wet-process gluing of concrete to European beech glued-laminated timber (GLT) is investigated by means of push-out tests.The tests were conducted on a specimen series with three different sizes of varying shear length, and evaluated using digital image correlation (DIC).The bondline shear strengths showed a pronounced size dependency, while the connection stiffness remained similar but showed a very large variability.These findings challenge the interpretation of bondline connection properties derived from push-out tests of glued TCC elements.In addition to the wet-process adhesive system with cement-based concrete, bonding between timber and a polymer concrete was investigated as an alternative possibility for TCC.