Keller, TSchaumann, EVallée, T2007-06-222007-06-222007-06-22200710.1016/j.compositesa.2006.07.007https://infoscience.epfl.ch/handle/20.500.14299/9288WOS:00024434030002410165This paper presents a new concept for a lightweight hybrid- FRP bridge deck. The sandwich construction consists of three layers: a fiber-reinforced polymer composite (FRP) sheet with T-upstands for the tensile skin, lightweight concrete (LC) for the core and a thin layer of ultra high performance reinforced concrete (UHPFRC) as a compression skin. Mechanical tests on eight hybrid beams were performed with two types of LC and two types of FRP/LC interface: unbonded (only mechanical interlocking of LC between T- upstands) and bonded with an epoxy adhesive. The ultimate loads of the beams increased by 104% on average due to bonding. However, the beam failure mode changed from ductile to brittle. The beams using a LC of 44% higher density exhibited an 81% increase in the ultimate load. The manufacturing of the beams proved to be economic in that epoxy and concrete layers were rapidly and easily applied wet-in-wet without intermediate curing times. The experimental results showed positive results regarding the feasibility of the suggested hybrid bridge deck. [All rights reserved Elsevier]adhesive bondingadhesivesbeams (structures)bendingbridges (structures)brittlenesscuringductilityfibre reinforced plasticslightweight structuresreinforced concretesandwich structuressheet materialstext::journal::journal article::research article