Consider the below statements with respect to cement concrete and identify the
correct statement(s)
i. Size and shape of aggregates used in making concrete influence the workability of concrete.
ii. As the water cement ratio in making concrete increases, the strength of concrete increases.
iii. Maturity of concrete is independent of temperature at which it is cured.

Correct option is C

Effect of water-cement ratio on concrete:
• The ratio of water-cement is generally lying in between 0.35 to 0.65.
• Water cement ratio inversely proportional to the strength of concrete. If the water-cement ratio increases then the strength decreases and vice versa.
• And W/C is directly related to workability because if the water-cement ratio increases
then the concrete gets wetter and more consistent and can be placed easily. Size of Aggregates
• Finer aggregate requires more water because of larger surface area, hence aggregate with finer particles need more water to make it workable.
• On the other hand, bigger particles have less surface area, and therefore demand less water for wetting surface and require less amount of paste for lubricating.
• So bigger particles give higher workability for fixed water content. The Shape of Aggregates
• Irregular shape and rougher texture of angular aggregate require more water as compared with the round shaped aggregate.
• For fixed volume or weight, rounded particles has lesser surface area and lesser voids.
• Hence round shaped aggregates gives higher workability than angular, flaky or elongated aggregates. Concrete Maturity
• Concrete maturity reflects how far curing has progressed.
• Maturity is the relationship between concrete temperature, time, and strength gain.