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partyarti8 Sep 2016 22:19Hello everyone,
We had our reinforced foundation poured with a C 20/25 concrete XC3.
However, I have now learned that normally XC2 is used for foundations. According to the standard, XC3 is meant for exposure to air with only moderate humidity.
Is using XC3 incorrect? Could this have any consequences that might arise over the years?
Best regards,
Arthur
We had our reinforced foundation poured with a C 20/25 concrete XC3.
However, I have now learned that normally XC2 is used for foundations. According to the standard, XC3 is meant for exposure to air with only moderate humidity.
Is using XC3 incorrect? Could this have any consequences that might arise over the years?
Best regards,
Arthur
Hello "partyarti",
The concrete exposure class designation XC2 is required when corrosion of the reinforcing steel due to carbonation of the cement paste is expected.
Depending on the environmental conditions that the concrete is exposed to, the classes range from XC1 to XC4. The latter class is used in the most severe moisture conditions.
However, in your project, we are not dealing with an industrial hall but possibly a residential building.
This means that the ground slab will be covered, moisture can only come from below – and then the back side must be waterproofed if the basement spaces in contact with the ground are intended for more than just secondary uses.
Assessing this is the responsibility of the designer.
Ultimately, there will be no CO2 accumulation under the slab that would make the exposure class mentioned above necessary.
In the case of an exposed production or storage hall, this might be critical.
But not for a residential building!
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Best regards, KlaRa
The concrete exposure class designation XC2 is required when corrosion of the reinforcing steel due to carbonation of the cement paste is expected.
Depending on the environmental conditions that the concrete is exposed to, the classes range from XC1 to XC4. The latter class is used in the most severe moisture conditions.
However, in your project, we are not dealing with an industrial hall but possibly a residential building.
This means that the ground slab will be covered, moisture can only come from below – and then the back side must be waterproofed if the basement spaces in contact with the ground are intended for more than just secondary uses.
Assessing this is the responsibility of the designer.
Ultimately, there will be no CO2 accumulation under the slab that would make the exposure class mentioned above necessary.
In the case of an exposed production or storage hall, this might be critical.
But not for a residential building!
---------------------------------------------------------
Best regards, KlaRa
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partyarti15 Sep 2016 11:39Hello everyone,
First of all, thank you for your replies.
The following day, I had many phone calls:
Statement from concrete plants (where the concrete was ordered): XC3 is of higher quality than XC2, so there should be no concern. The plant no longer supplies C20/25 XC2, only from XC3 upwards.
Statement from another concrete plant: same as above.
Statement from the architect: no problem, XC3 is better.
Statement from the structural engineer: same as the architect’s statement.
Best regards,
Arti
First of all, thank you for your replies.
The following day, I had many phone calls:
Statement from concrete plants (where the concrete was ordered): XC3 is of higher quality than XC2, so there should be no concern. The plant no longer supplies C20/25 XC2, only from XC3 upwards.
Statement from another concrete plant: same as above.
Statement from the architect: no problem, XC3 is better.
Statement from the structural engineer: same as the architect’s statement.
Best regards,
Arti
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