Handbook for Bridge Inspections - TSP2

Completion Surveys & Major Inspections
ECP measurements are not normally taken in these instances. The
need for such tests during a main inspection will be init iallyassessed
on the basis of visual observati ons and the resul ts of the tests
both of the depth of carbonisation and the chloride c ontent.
Special Inspections
EC P measurements should be conducted as per special instructions
and should be verified by cutti ng into the concrete. Refer to
Chapter 7.3.8. The chloride content, depth of carbonising and
cover should all be measured at the place where the concrete is cut
inlo.
Advantages and
Disadvantages
•
FigWl? 7.3-7: Takil/g ECP
AI eusu rem e illS
Equipment
Figure 7.3-8: Drillil/g Ollt (I
Concrete Core
Methods
This method is easy to use, non-destructive and rel"tively quick
with the resu lt that large secti ons can be checked. It can provide a
satisfactory picture of the cond ition of the reinforce ment at any
given moment. The risk of corrosion can be detectetd during an
earl ier phase before visible damage becomes obvious. People possessing
professional competence should be used both for site work
and the interpretation of the results. The method does not record
the speed of the corrosion process.
ECP Equipment:
• Metering electrodes
• Voltmeter
• Cables
• Data recorder
Other:
• Spray bottle for moistening concrete
• Device for measuring the cover
• Clips for mak ing contact wilh the reinforcement
• Chalk
• Wire brush
7.3.5 Determining the level of Strength
To detennine the compressive strength of hardened concrete
should, for example, below standard concrete be suspected.
Compressive strength can be determined by, amongst other things:
• Pressure testing of concrete cores dri lled out
• Jackhammer
Pressure testing of concrete cores drilled 0 ut
Procedures
Advantages and
Di sadvantages
Reference is made to the Norwegian Public Roads Admini stration
Handbook No. 015: "On Site Testing" for the drilliog Oul of concrete
cores, and to the Nat ional Public Roads Administration
Handbook No. 014: " Laboratory Test ing" fo r pressure testing the
concrete cores.
This methods produces precise pressure test val ues for the cores in
question, but does req uire expensive equipment and is to be consi-