| A unique patented field system for measuring the rate of corrosion and other parameters of reinforcement bars.
Complimentary Measurements
Corrosion potentials can be taken, and interpreted to give a
probability of corrosion. However, these half cell potential
values do not give precise information on the risk of corrosion. A direct relationship between corrosion rate and corrosion potential has not been established.
Concrete resistivity of the area around the sensor is defined
from the formula:
RESISTIVITY = 2 x R x D
Where R is the resistance of a pulse between the sensor
electrode and the rebar network.
D is electrode diameter and the sensor.
Concrete resistivity measured by Gecor 6™ is useful in the interpretation of corrosion rate because it is related to the moisture content.
>100 to 200k cm Very low corrosion rate even with high chloride concentration or carbonation.
50-100k cm Low corrosion rate
10-50k cm Moderate to high corrosion rate where steel is active
<10k cm Resistivity is not the controlling parameter of the corrosion rate
Since the rate of oxidation is directly related to the amount of heat energy available, temperature has a direct effect on corrosion rate. Relative humidity decreases with increasing temperature and resistivity increases with increasing temperature.
Relative humidity influences the amount of moisture in the pores of the concrete to sustain the corrosion reaction as well as water run off, dew formation, etc. |
