core test jistification

Project:www.sefindia.org
Component:Miscellaneous
Category:support request
Priority:normal
Assigned:anil102
Status:active
Description

i have the result of core test from different labs.
in all report age factor was applied.
and the final strength of concrete worked out is less then m30 (what we designed).

the contractor is arguing for not to apply the age factor.

is it o.k. or not?