Answer by Rakshita Nagayach:
Structural cracks due to shrinkage can be identified as:
- Corrosion of the reinforcement: If the reinforcement is placed too near the surface, it has chances to corrode. The iron expands due to oxidation and conversion to Iron oxide, which in turn results in cracks. So if the reinforcement is visible from the concrete surface, there are chances of cracks present and upcoming.
- Vertical cracks: These cracks mostly occur when the foundation has settled or disturbed unequally along its surface.
- Linear cracks: These cracks gradually grow and though they appear to be linear, there are interruptions in the crack-line which implies the crack is towards spreading itself.
- Network of cracks: These are due to the reaction of aggregate with some alkali hydroxide present in the concrete and can be easily seen by a network of cracks roughly growing as a circle in a group.
The reasons for these cracks can be read in
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