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Re: Structural Concrete subject to sub zero temp. conditions

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Lakshmana,
 
        If your foundation had more than 12 to 24 hours for the initial set to take place before freezing took place it will probably be fine.  I suggest that you thaw it out, let it cure for an appropriate length of time (as you would have done if the concrete had not frozen), then measure the surface strength of the concrete with a Schmidt Hammer.  If the concrete strength is satisfactory the concrete will be just fine.
 
Regards,
 
H. Daryl Richardson
----- Original Message -----
Sent: Sunday, March 16, 2008 12:24 PM
Subject: Structural Concrete subject to sub zero temp. conditions

Dear All,
 
We are facing a situation, where the top 3 to 4 inch depth of top surface of a concrete foundation for pump is covered with ice formation. 
Original design had never anticipated this situation, hence normal M35 grade concrete is used for this foundation.  Surface temp of the concrete fdn found to be above -20 Degree C,
 
Any input or reference to to handle this situation would be great help for me.
 
 
Best Regards
Lakshmana RK Nukala