Civil Engineering Reference
In-Depth Information
7.2.7 Chloride content and pH monitoring
There is discussion in the literature about monitoring pH and chloride
content (McCarter a
nd Vennesland
2004, Buenfeld et al. 2008). However,
there are no field data from such sensors and interpretation is difficult as
the corrosion threshold is not a fixed value of pH or chloride content as
discussed in (Broomfield 2007).
7.3 Remote monitoring systems and data management
There is a range of options for a corrosion monitoring system. For easily
accessible systems with a limited number of probes, a simple termination
box with sockets for plugging in meters is suitable.
Figure 7.8
shows manual
corrosion monitoring on a jetty with an LPR corrosion rate meter, a resistivity
meter and a digital voltmeter for reading the reference electrode potentials
(Broomfield 1998). The data in
Figure 7.7
was collected manually.
Data can be collected automatically and stored either for download to
a portable computer brought to site or by telecoms connection where the
engineer can connect remotely to the computer and download data. The
data in
Figure 7.3
was collected on a central computer from networked
sensors and downloaded remotely (Broomfield et al. 2003). Wireless systems
are under development but are still unproven in the field at the time of
and resistivity probes on a jetty.
