Causes Prevention and Repair of Cracks in Building-A Review Paper

Cracks in buildings are a common issue that compromise structural integrity, aesthetics, durability, and occupant safety. These cracks originate from a variety of factors including structural overloads, foundation settlement, thermal movements, shrinkage of concrete, poor construction practices, and environmental influences such as moisture variation and seismic activity. The nature and severity of cracking vary from harmless hairline surface cracks to serious structural fissures that can lead to partial or complete failure if left unaddressed. Effective mitigation begins with understanding the root causes through careful site investigation, material testing, and structural analysis. Preventive measures include proper mix design and curing of concrete, quality control during construction, adequate reinforcement detailing, provision of expansion joints, and ensuring uniform and well-designed foundations. Where cracks occur, repair methods must be selected based on crack width, depth, location, and underlying cause. Common repair techniques include epoxy injection, routing and sealing, grouting, stitching, and application of carbon fiber reinforcements, all backed by appropriate surface preparation and durability considerations. This paper reviews the principal causes of cracking, discusses practical preventive strategies, and evaluates contemporary repair technologies to enhance building performance, extend service life, and reduce maintenance costs. Understanding and addressing cracks holistically is essential for ensuring structural safety and sustainability in the built environment.