What is the process that hardens concrete?

What is the process that hardens concrete?

• A. Setting
• B. Drying
• C. Mixing
• D. Curing

Answer: (D)

Hardening of concrete comes from curing. After the mix is placed, cement reacts with water in a chemical process called hydration. This reaction continues as long as moisture and proper temperature are maintained, and it builds the strength and durability of the concrete. Keeping the concrete moist (and at the right temperature) allows hydration to proceed fully, leading to higher strength over time. Setting is the initial stiffening that happens soon after placement; it moves the mix from plastic to solid, but it doesn’t guarantee long-term strength. Drying involves moisture loss and can actually hinder strength development and cause cracking if it happens too quickly. Mixing is simply the step of combining ingredients before placement and does not by itself harden the concrete.

Hardening of concrete comes from curing. After the mix is placed, cement reacts with water in a chemical process called hydration. This reaction continues as long as moisture and proper temperature are maintained, and it builds the strength and durability of the concrete. Keeping the concrete moist (and at the right temperature) allows hydration to proceed fully, leading to higher strength over time.

Setting is the initial stiffening that happens soon after placement; it moves the mix from plastic to solid, but it doesn’t guarantee long-term strength. Drying involves moisture loss and can actually hinder strength development and cause cracking if it happens too quickly. Mixing is simply the step of combining ingredients before placement and does not by itself harden the concrete.