Civil Engineering Reference
In-Depth Information
Element type
Anchorage details
Installation date
Older
installation
Low
vulnerablility
Ye s
No
Corrosion
protection
Ye s
No
Ye s
Mechanical
anchorage
High
strength steel
F
pu
> 1000 MPa
No
No
Ye s
PTI corrosion protection level
I
II
None
High
vulnerablility
Figure 12.9
Decision
Tree for
assessing
vulnerability
of elements
to corrosion
and loss of
anchorage
capacity.
High
strength steel
F
pu
> 1000 MPa
Moderate
vulnerablility
N
o
Ye s
Table 12.7
Values of constants
K
and
n
for corrosion rate calculations
Parameter
Normal
=
Aggressive
=
Very aggressive
=
<
700; pH
2000
-
5000;
a
pH
=
5
-
10
700
-
2000; pH
=
5
-
10
=
<
5
K(
ยต
m
)
35
50
340
n
1.0
1.0
1.0
Note
a
is soil resistivity (ohm/cm).
