### Compressive Strength of Concrete Cubes Lab

Compressive Strength Table of Concrete at 7 28 Days. Grade of Concrete: Minimum compressive strength N/mm2 at 7 days: Specified characteristic compressive strength (N/mm2) at 28 days: M15: 10: 15: M20: : 20: M25: 17: 25: M30: 20: 30: M35: : 35: M40: 27: 40: M45: 30: 45 . Compressive Strength of Concrete Lab Test Objective . To find compressive strength value of concrete cubes