Importance of water/cement ratio in the concrete mix :

i. The W/C ratio plays very vital role in concrete mixture. The improper or random selection of W/C ratio leads in various defects in fresh and hardened concrete.

ii. If W/C ratio is less (say w/c= 1/4 = 0.25), then concrete will become harsh and results in honeycombing or porous nature due to poor workability.

iii. If w/c ratio is more (say w/c = 3/4 = 0.75), then concrete undergoes segregation and bleeding. Thus finally concrete shows defects in it.

iv. Therefore w/c ratio should be optimum, which depends on grade of concrete and exposure conditions hence w/c ratio should be selected from IS: 456:2000.

v. If w/c ratio is opted out properly as mentioned above, then concrete possess good workability, compressive strength and durability ultimately.