When we see a crack in concrete, most of us don't know why it is there. Lots of questions are asked and few answers are given. Today there are many strange phenomena that occur in construction, but one of the most important ones is a crack in the concrete. A crack is defined as a complete or incomplete separation of concrete into two or more parts produced by failure in concrete due to its expanding and shrinking because concrete is weaker in tension than in compression. Cracks are hairlines that take multiple directions up or down and most often appear at weak points like corners, basement windows, frames, walls, etc. They can be warning signs for very serious problems in a building that lead to serious issues like collapse, water penetration, growth of insects, etc. They are happening due to either structural causes (cracks that can occur due to several factors that affect concrete, such as the strength of the concrete, the number, sizing, and placement of reinforcing bars, and size and shape of the concrete cross-section) or non-structural causes (cracks that can arise from the effect of external conditions on the building like climatic conditions, natural disasters, etc.). Although there are many different causes of cracks, which can lead to different types of cracking patterns, they are categorized into two types of causes: active and dormant.  There are several active causes of cracks. For example, corrosion of the steel in concrete or rust can be a major structural issue in reinforced concrete. Corrosion comes from the salts in the water that is added to concrete, which lead in the future to reactions between concrete and steel, and due to this reaction an outer brown layer will cover the steel, causing concrete to expand and then to crack ("Types of Cracks in Concrete and Typical Causes. 24 Feb, 2012"). Another active factor that leads to cracks is overloading on concrete, concentrate force being applied at the top of a struct