The object of curing is NOT to:
Correct Answer: B. Reduce the strength of concrete
📚 Detailed Explanation: Curing Never Aims to Reduce Strength
Why B is the answer (NOT an objective of curing): Curing increases, or at least preserves, the strength of concrete. Statement B says curing aims to reduce strength — this is the exact opposite of its purpose and therefore the one statement that is NOT an objective of curing.
Actual Objectives of Curing (A, C, D are all true)
| Objective | Is it an Aim of Curing? | Why |
|---|---|---|
| A. Reduce shrinkage | YES — a curing objective | Moisture retention slows drying shrinkage and prevents cracking |
| B. Reduce strength | NO — NOT an objective (answer) | Curing INCREASES strength by enabling continued hydration |
| C. Prevent evaporation | YES — a curing objective | Retaining mix water is the mechanism by which hydration continues |
| D. Preserve properties | YES — a curing objective | Full hydration preserves design strength, impermeability, and durability |
Strength vs. Curing Duration
| Curing Action | Effect on Strength |
|---|---|
| No curing | 50–60% of design strength |
| 7-day curing | ~85% |
| 28-day curing | 100%+ |
- The object of curing is NEVER to reduce strength — it always aims to increase or achieve full strength.