Why is lintel cracking at end when de-moulding?

Lintel cracking at the ends during de-moulding can occur due to several factors, including insufficient curing time, rapid temperature changes, or excessive moisture loss. Additionally, if the concrete mix has a high water-to-cement ratio or if there are design flaws, it can lead to weak points that are more susceptible to cracking. Improper support during the curing process may also contribute, as any movement or stress on the lintel can cause cracks to form. Proper curing and handling techniques are essential to mitigate these issues.