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Buildings and other structures have a certain useful life, which depends on the specifications adopted. The large numbers of monuments, which are cherished heritage structures have stood well over a period of time. But some of these have shown signs of distress due to age, aggressive natural environment/industrial pollution etc. Further, distress gets aggravated due to overloading and misuse of buildings. A few Buildings have also failed due to faulty design or construction. The various causes of structural failure and the principles of rehabilitation of structures are discussed. In the structures, the cracks are generated due to different causes e.g. in some cases cracks are caused after the structure has been completed for a few years which results in shortening of life and strength of structure. The main criteria is how to repair a reinforced concrete elements of structures and for this the skills, knowledge, and experience required to repair damaged or deteriorated structures are decidedly different from those required to build new structures. The purpose of this paper is to justify the latest techniques, advanced materials and various requirements of repairing work to obstruct the deterioration which is necessary and economical than to reconstruct the building.
International Journal for Research in Applied Science and Engineering Technology IJRASET
Case Studies of Rehabilitation / Repair of Reinforced Cement Concrete Structures2020 •
Reinforced cement concrete (RCC) as a construction material has come into use for the last one century. In India, RCC has been used extensively in the last 50-60years.During this period, we have created large number of infrastructural assets in terms of buildings, bridges, sports stadium etc., which are lifeline for the civilized society. These have been created with huge investment of resources. We cannot even dream of recreating such assets out of limited national resources. It is there more essential to maintain them in functional condition. Since, deterioration of RCC is a natural phenomenon and has started exhibiting in large number of structures, a systematic approach is needed in dealing with such problems. Identification of the causes of deterioration and consequent repair/rehabilitation strategy at optimum cost needs a scientific evaluation and solution. It has been observed that the deterioration phenomena of RCC are not realized by majority of practicing civil engineers. As a result, the factors considered necessary for durability of RCC buildings are many times not given due importance during construction and/or during maintenance. I. INTRODUCTION As the human body becomes deteriorated upon ageing after a certain period of time, then there is important that problem can be remedied by taking necessary actions and preventive steps at the appropriate time. This is exactly the case with buildings. As time passes, the condition of buildings also becomes deteriorated due to various factors. Rehabilitation of structures is a multidisciplinary activity. The concerned engineer or the concerned faculty should know the design aspects, environmental factors, construction procedure, and about building materials and the other things. The rehabilitation of existing structures is a more complicated, difficult as well as sophisticated task than new construction. Thus, some numbers of non-destructive, partially destructive and destructive techniques in the existing RCC structures are used for evaluation of concrete structure and to predict and analyze the cause of deterioration of the concrete. To overcome the ill effects caused by these deteriorated buildings Repair and Rehabilitation works are carried out from periodic time. Many of the existing structures were designed with the help of codes that have since been modified and upgraded. Concrete constructions require proper care in the form of regular maintenance. If buildings remain for several years with im proper attention and negligence then, various factors like water clogging, paint peeling, plaster break-off, fungus and other organic growth, cracking and creeping of external surfaces will affect the structure.
International Journal for Research in Applied Science & Engineering Technology (IJRASET)
A Review on Study of Rehabilitation and Repair Techniques of R.C.C. Building2022 •
Cement concrete reinforced with steel bars is an extremely popular construction material. One major flaw, namely its susceptibility to environmental attack, can severely reduce the strength and life of these structures. External reinforcement using steel plates have been used in earlier attempts to rehabilitate these structures. The most important problem that limited their wider application is corrosion.
Repair-To bring back position of structure to previous condition so as to give performance same as previous. It does not cover strength aspect of structure. Common objective of repair are as follows-1) Patching up defects such as cracks and fall of plaster. 2) Repairing doors, windows, replacement of glass panels. 3) Checking and repairing electrical wiring. 4) Checking and repairing gas pipes, water pipes & plumbing services. 5) Rebuilding structural walls, disturbed roof tiles etc. 6) Relaying cracked flooring Rehabilitation-Rehabilitation of a building means returning a building or a structure to useful state by means of repair, modification or alteration. It is related to strength aspect of structure. To bring back the position and condition of structure by considering strength aspect. Common objectives of rehabilitation are as follows-1) To fill wide cracks using some suitable material. 2) Injecting epoxy like material into cracks in walls, columns, beams. 3) Removal of damaged portion of masonry and reconstructing it using rich mortar mix. 4) Addition of reinforcing mesh on both sides of wall.
This paper deals with the latest techniques in repair and rehabilitation of structures. The various causes of structural failure and the principles of rehabilitation of structures are discussed. Major repair that are to be carried out in Brick walls, Plaster walls and RCC members are explained in detail and an in-depth analysis into Reinforced Cement Concrete repair options like Shotcrete method (Guniting) and Form and Pump Method. The paper also deals with the comparatively new Form and Pump technique developed for the past 10 years are discussed.
Repair and Rehabilitation of Structures
Repair and Rehabilitation of Concrete Structures2019 •
This book tries to collect the main ideas, techniques, and methods used by these prominent engineers in order to repair and rehab the large variety of structures. Furthermore, this book presents study cases of rehabilitation of structures such as bridges, buildings, garages, hotels and other exciting kind of structures. What is more, the book discuss about different types of construction as Pre-stressing, Post-tensioning, Cast-in-place, Pre-cast.
2020 •
This paper reviews works on repairing of deteriorated reinforced concrete bridge. Every structural element should be designed for a particular type of loading as well as for adopting of different types of environment. However, many civil structures like reinforced concrete bridge are often required to be repaired to restore the structural integrity and to protect the reinforcement from sever weathering condition. Recently repairing is gradually increasing with the increase of age of concrete structures. In some instances, it may be more economical to accept the need for maintenance or repair at suitable intervals than to attempt to build a structure that will be maintenance-free under severe conditions for a long period. In the present era, there are so many buildings and bridges which collapse fully or partially due to lack of maintenance, improper construction method and material. They need repairing to make them safe. Repair are always neglected or delayed by many people in most of structures and financial ability and so it leads to major hazards. Hence it is needed proper repair and reconstruction application. In this project we focus on cracks heeling, concrete jacketing and other techniques on bridge which required maintenance and repairing of structure which have more than of their certain life and which has affected by weathering conditions, improper techniques in construction etc. The process involve in this project are:- Scope of repair and rehabilitation Health assessment of the existing structure in adherence with latest tools Repair and retrofitting methods and Post retrofitting evaluation for behaviour of the structure.
Concrete is the material most widely used in the construction of reinforced concrete structures including hydraulic structures. There are many diversified applications of reinforced concrete for storage, conveyance and collection of potable water and seawater, irrigation, and wastewater conveyance and treatment. In the Arabian Gulf, the potentially aggressive environment has resulted in premature deterioration of numerous structures in a service performance span of less than a decade. The environment characterized by high humidity and temperature and excessive air/soil borne salinity has resulted in corrosion of the reinforcement and subsequent cracking and spalling of concrete. This paper will address the issues related to repair and strengthening techniques of three reinforced concrete structures. The first case deals with the inspection, assessment and repair strategy of mosque in Dammam. Investigation of structural distress and cracking in a newly constructed seawater conveyance...
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Whole exome sequencing identifies causative mutations in the majority of consanguineous or familial cases with childhood-onset increased renal echogenicity2016 •
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