Defects in concrete are mainly due to poor workmanship and low quality of materials used. Most common defects are

Honey combing

Caused by improper compaction and less than adequate vibration. Concrete must be properly compacted after placing orals honeycomb will occur. too much vibration will cause segregation that is the aggregates will separate from the mortar. Concrete

Cracking

Cracking is the most common defect found in concrete structures. Cracks can be formed by different reasons

Crazing

if the concrete is exposed to high temperatures small hairline cracks appears on the surface which be of irregular patteren such cracks are called crazing.

Spalling of concrete

Spalling is very dangerous type of concrete defect because spalling indicates the weakness in structure. These kinds of defects must be attended and rectified soon.