Deterioration of concrete structures along with case studies in India

Concrete is used extensively in various types of construction works. However, the deterioration of reinforced-concrete structures is recognised as a major problem worldwide. Apart from requiring regular maintenance, many structures require extensive repair, rehabilitation and retrofitting. Over a period of time, as these structures become older, certain degradation or deterioration with resultant distress manifested in the form of cracking, splitting, delaminating and corrosion is found in them. Such deteriorated structures can be rehabilitated and retrofitted by using various types of admixtures and modern repair materials. This paper discusses the present state of concrete structures and the major areas where improvement is needed during the service life stage for sustainable development. It also discusses the method of carrying out repair, rehabilitation and retrofitting. This is detailed in the paper along with various case studies compiled by the author based on his field experience of direct involvement in the planning and execution of repair and rehabilitation jobs, which were successfully completed by using the latest repair materials and techniques.