Measuring Welded Mesh And Joined Bars - Elcometer Protovale 331 Operating Instructions Manual

9 MEASURING WELDED MESH AND JOINED BARS

The procedures for locating and measuring depth of cover of welded mesh and
joined bars are similar to those for reinforcement bars as described in sections
5 and 6 (pages 16 to 22). This section highlights the additional factors which
must be considered when measuring welded mesh or joined bars.
When searching for isolated reinforcing bars, the Covermeter induces eddy
currents within the individual bars. Welded mesh reinforcements however
create current loops which produce additional strong signals.
When searching for welded mesh reinforcements, it is common to encounter
three levels of signal:
Very strong signals
Very strong signals are obtained when the search head is across the centre bar
of a double or 'figure-of-eight' loop. These locations must not be used for cover
measurements.
Figure 13. Strong signals at centre of 'figure-of-eight'
M
EASURING WELDED MESH AND JOINED BARS
0
Men u
Esc
R
R
25