Bond Strength
Arguably the most important property contributing
to a successful reinforced concrete structure
is the bond strength between the reinforcing
steel and the concrete. A strong bond
must be developed in order for the concrete
to achieve its designed capacity. Factors
that influence the strength or reinforced
concrete include, but not limited to, are
bar diameter, the absence or presence of bar
surface deformations (ribs), the geometry
of the ribs, concrete cover over the bars,
and the orientation in the concrete matrix.
The following graph compares the bond
strength of galvanized rebar and black
steel.
Good bonding between reinforcing steel and
concrete is essential for reliable performance
of reinforced concrete structures. When protective
coatings on steel are used, it is essential
to ensure that these coatings do not reduce
bond strength. Studies on the bonding of galvanized
and black steel bars to Portland Cement concrete
have been investigated. The results of these
studies indicate:
