The pre-stressed steel wire is
tensioned approx. 70 to 80% of
the minimum specified breaking
load of steel wire prior to casting
of concrete. After initial setting
of concrete, the pre-tensioned
steel wire is released and the
stress in the wire is induced in
the concrete. This induced
compressive stress will neutralize
the tensile stress caused by the
acting loads on the concrete
member. In the case of pre-
tensioning, it is important that
adequate bond is created
between the steel wire and
concrete in order to transfer the
desired compressive force from
the steel wire to the concrete.
In order to improve the bond
strength and achieve a
consistently low transmission
length, regular indentations of
specified shape in the wire
surface in either opposite or 120-
degree planes or 90-degree
planes were introduced. In the
known art of indenting
operation, it is possible only to
make 2
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