Electrical surface resistivity of cement/concrete
Electrical surface resistivity of cement/concrete
(OP)
Does any one know what's the surface resistivity (electrical property) of cement or concrete? Could it be 10^15 ohm?
Thanks
Thanks
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Electrical surface resistivity of cement/concrete
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Electrical surface resistivity of cement/concreteElectrical surface resistivity of cement/concrete(OP)
Does any one know what's the surface resistivity (electrical property) of cement or concrete? Could it be 10^15 ohm?
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RE: Electrical surface resistivity of cement/concrete
Keep in mind that concrete is an hygroscopy material that retain moisture for relative long time.
RE: Electrical surface resistivity of cement/concrete
Thanks for your answer. According to the info you gave, the concrete is electrically conductive - with the range 0 - 10^5 Ohm-cm. Is it right?
Thanks
Jack
RE: Electrical surface resistivity of cement/concrete
The upper resistivity range of 105 Ohm-cm that you mentioned could be possible in very long dry season typically of desert areas.
In regular climate, the hygroscope property of concrete retains the soil moisture for around 30 days without significant reduction on resistivity.
A safe approach for grounding requirement in power stations and several other electrical facilities is to consider the concrete with sufficient moisture. If your application is different you should evaluate the site environment condition and choose the resistivity more suitable for the application.
In accordance with IEEE Std 80 the concrete resistivity ranges are as follow:
1- Wet............. 1x108 to 1x1011 Ohm-cm.
2- Dry............. 21 to 100. Ohm-m (2,100 to 10,000 Ohm-cm)
Note: Ohm-m =100 Ohm-cm.
RE: Electrical surface resistivity of cement/concrete
The data showed in the above post should be switched as follow:
1- Dry............. 1x108 to 1x1011 Ohm-cm.
2- Wet............. 21 to 100. Ohm-m (2,100 to 10,000 Ohm-cm)
RE: Electrical surface resistivity of cement/concrete