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1. inadequate initail design.
2. indaeqate care , supervision during construction.
3. wrong choice of materail.
4. unexpected enviromenatl conditions.
5. indaquate maintenance.
Apart from above mentioned reasons,few other reasons are Differential settlements of foundation,swelling and shrinkage of soil .
structures may fail due to varios reasons and many factors contribute to it it may include
1.Improper mixing of concrete
2. bad workmanship
3. Lack of maintenance allowing water to enter structure and let steel corroded
4. Not designed according to the requirement and load conditions
5.reinforcements projecting outward and precautions not taken
