Study on deformation recovery and dynamic mechanical characteristics of self-compacting polyurethane mixture for steel bridge deck pavement

A novel self-compacting polyurethane mixture (SPUM) is consolidated under gravity without additional vibration, which is proposed as steel bridge pavement material. This study aims to evaluate fatigue life, deformation recovery and dynamic mechanical behaviors of SPUM with different binder contents. The results reveal that fatigue life of SPUM is enhanced by 1.6−2.1 times within binder content of 12% and 13.5%. Moreover, internal stress of SPUM exhibits negative trend with temperature and binder content. SPUM with lower binder content at room temperature exhibits desirable deformation recovery characteristics. Given binder content of 12−13%, dynamic modulus of SPUM is reduced by 9.5−33.6% while phase angle is increased by up to 16%. Dynamic modulus of SPUM presents negative trend with test temperature while phase angle of SPUM is positive to temperature. Compared to EA-10, SPUM presents larger fatigue life, internal stress, and dynamic modulus and lower phase angle. Life cycle analysis reveals that energy consumption and total emission of EA-10 are respectively 1.04 times and 1.05 times higher than those of SPUM. Thereafter, the construction of SPUM is conducive to energy conservation and low carbon emissions. This research outcomes facilitate structural design and utilization of steel bridge deck paving with SPUM.