Historic Rebar Grades 1

[stallion0002]

We have a project that will require retrofitting the existing foundations of a structure. The eixisitng foundations were built back around 1945-1950. The original blueprits that we have do not indicate concrete strength or rebar strength. Does anyone have any data on 'standard' concrete and rebar strengths from that time period?

Thanks.

 

[SlideRuleEra]

See the file below:

http://www.SlideRuleEra.net

http://www.VacuumTubeEra.net

 

[shobroco]

The materials could vary considerably & I think it is pretty risky to use any sort of historical standard unless your building addition is pretty minor. Testing is not that expensive & will give you definite information.