SPALL REPAIR USING 3D PRINTER AND EPOXY RESIN ADHESIVE

The spall repair sequence currently used is as follows. The damage is removed from the heavy equipment and fresh concrete is poured into the cleaned section. The curing compound is then applied to the patching to prevent drying shrinkage or to absorb water. But this spall repair method requires many equipment and time. During the repair process, adjacent roads must be closed in order to secure a working space, often resulting in traffic congestion. According to the report of the US Department of Transportation, the depreciation can be up to $ 20,000 a day by traffic jams. The depreciation can be easily calculated up to $ 140,000 by blocking a road for seven days to repair spalls.The objective of this research is to see if the 3D printing technology can be used for repairing the spall damage on the concrete pavement. More specifically, this study investigates whether the bond line thickness will have an influence on the shear strength development when an adhesive layer is present between the spall and the 3D printed concrete segment using a simple finite element method. In addition, this study proposes a modified test method of ASTM C882 to experimentally investigate the influence of bond line thickness on shear strength. This is the new test method to investigate the effect of bond line thickness of epoxy-resin adhesive on shear strength when the glue applied to concrete adherend.