C1-T 2 Days 7 Days 28 Days Concrete 1 2830 3505 4470 Concrete 2 3295 3430 4740 Concrete 3 2710 3670 5115 Concrete 4 2855 3355 4880 Concrete 5 2980 3985 4445 Concrete 6 3065 3630 4080 Concrete 7 3765 4570 5390