Beschreibung:
<jats:p> Bridges with adjacent box beams and voided slabs are common and have grouted shear keys to transfer the load between beams. However, cracks occur in the transverse direction and in the bond area along the joint. Even when a waterproofing membrane is in place, shear keys crack and deicing salts leak through the cracks and thus cause corrosion in the prestressing strands of the beams and deterioration of the grout. The resulting corroded and broken strands endanger the structural integrity of the bridge, and the compromised grout provides less shear transfer. In the study described in this report, two bridge structures with adjacent voided slabs were selected and three grouting materials—a nonshrink grout without any fibers, engineered cementitious composite (ECC) with polyvinyl alcohol fibers, and ultrahigh-performance concrete (UHPC) with steel fibers—were used in the shear keys. The test results and visual observations indicate that all grouting materials had good bond strengths, dictated by the strength of the existing concrete; however, ECC had the best performance, as it did not leak within the 3-month examination period and performed satisfactorily in both bridges after 1 year of observation. The bridges are overlaid with asphalt. </jats:p>