The retrofitting process of the damaged structure members is needed in order to
achieve the good performance of the structure members. One of the methods to do
the retrofitting process is called jacketing technique. The common jacketing
technique consists of concrete, steel, and FRP jacketing. Although those three types
of jacketing give some benefits, there are also some drawback. The use of UHPC
jacketing can be considered to overcome the drawback of those three-jacketing
technique. In order to retrofit by using jacketing technique, the bond strength
between the substrate concrete and overlay concrete must be well considered. The
bond strength can be controlled by some parameters such as substrate surface
condition, curing condition, mechanical connectors and the use of bonding agent.
The best method for the parameters is exposing the aggregate and saturated
condition, normal and water curing, higher concrete substrate strength and 28 days
age of UHPC, and the use of bonding agent on the smooth surface and the absence
of the bonding agent on the rough surface, respectively. Besides that, the use of
mechanical connectors can be considered to improve the bond strength. Some
consideration such as the diameter of connectors of 22 mm, the height of the
connectors of 100 mm, UHPC thickness of 50 mm, and the use of fiber and
longitudinal steel rebars are proven to enhance the bond strength and achieve the
ductility demand. Furthermore, the parameters mentioned above are proven to
enhance the bond strength at the interface between substrate concrete and overlay
concrete.