Slump (inches) 7-day PSI 28-day PSI 4.5 2330 4025 4.25 2640 4535 3 3360 4985 4 1770 3890 3.75 2590 3810 2.5 3080 4685 4 2050 3765 5 2220 3350 4.5 2240 3610 5 2510 3875 2.5 2250 4475