To study the workability of epoxy adhesive used as bonding layer in steel-concrete composite deck

a steel deck with pavement casted by unreinforced ultra-high performance concrete was chosen as research object

and an epoxy layer was introduced to connect the two materials. In the process of adhesive applying

the situation of poor pretreatment of steel surface was considered. A static test was conducted to evaluate the cohesive shear strength of the steel-concrete composite joint

and a full-scale deck specimen adopting the same adhesive bonding method was designed and tested under bending loads. The mechanical behaviors of the specimen were investigated

which include deflection of specimen

strain at different positions

and ultimate bearing capacity. The failure modes of the bonding layer were recoded

and the strain of the bonding layer before failure was analyzed by finite element method. Results show that epoxy adhesive was convenient for construction as a bonding layer between unreinforced rigid pavement and steel deck

and surface pretreatment of steel had influence on the bonding strength. The epoxy bonding ensured a reliable connection between the steel deck and the rigid pavement even with a poor pretreatment of the steel surface. Steel yielding occurred prior to the cohesive failure between the steel and the concrete. In addition

the bonding layer had a non-uniform shear stress distribution that the stress at the rib-to-deck joint was higher than other positions. The steel deck with adhesively bonded rigid pavement exhibited good ductility and high bearing capacity.