INTRODUCTION
Cracks in concrete are common and it if often misunderstood as not having done mixing properly or compaction properly or problem in foundation and many more. In general cases cracks sizes ranging from 1/4 inch to 1/16 inch is considered to be acceptable limit. One can control cracking by properly preparing the subbase, proper curing, not favouring under-reinforcement or over-reinforcement, by proper placing and spacing crack control joints, etc. To fix narrow cracks in concrete, caulk-style concrete repair compound is used because of its easy application. For larger cracks especially in case of walls, epoxy injection kit is used which allows deep penetration through cracks. In case of repairing of stairs, vinyl concrete patcher is used as it is durable and easy to mould into a step like shape.

