### Concrete Mix Design Calculation - M20, M25, M30 ...

Mix is stable, cohesive, and workable and had a true slump of about 75 mm. Desired slump = 50-75 mm. So, it has achieved desired workability by satisfying the requirement of 50-75 mm slump value . Now, we need to go for trial mix-4. Concrete Trial Mix 4: In this case water / cement ratio is decreased by 10% keeping water content constant. W/c = 0.45