Strengthening rc columns with ultra high performance concrete. Jacketing is one of the most frequently used techniques to strengthen reinforced concrete rc columns. Concrete materials and teaching for mathematical understanding patrick w. Introduction repairing of reinforced concrete elements is required after a damage. Schematic view of steel plate jacketing of columns in connections is shown in figure 8. A steel reinforcement cage or composite material wrap can be constructed around the damaged section onto which shotcrete or castin place concrete is placed. These beams km31, km32, km33 are repaired by bonding st37, 6501200 mm epoxy resin plates to both sides of the beams bending zone and tensile zone figure 7, 8. Repair and rehabilitation structural rehabilitation of. Guidelines for external prestressing as strengthening. Concrete engineering subcourse number en 5466 edition a united states army engineer school fort leonard wood, mo 65473 9 credit hours edition date. Concrete is an ideal medium for recycling waste or industrial byproducts. Basics of concrete materials and testing one day, 7.
A consumers guide to buying wood whether you are building a deck or just buying a nightstand, your purchase can have an impact on forests and people. Repairing and strengthening methods for rc structural members. Properties of concrete while cement in one form or another has been around for centuries, the type we use was invented in 1824 in britain. Strengthening of reinforced concrete columns by reinforced concrete jacket project recommendations andre filipe da silva henriques instituto superior tecnico andre. About four tons of concrete are produced per person per year worldwide and about 1. Strengthening rc columns with ultra high performance concrete inyeong koo1 and sunggul hong2 1, 2 department of architecture, snu, seoul, korea. Introduction to concrete portland cement association. Strengthened columns appeared to work as monolithic structures.
Generally when filing concrete, you should use a rasp instead of a regular file because the larger teeth or grit on the rasp are better suited to the rough texture of the. Although only external cable method, bonding and jacketing method and overlaying and jacketing method are covered in the guidelines, the main concept is applicable to any retrofitting method. The most common types of jackets are steel jacket, reinforced concrete jacket, fibre reinforced polymer composite jacket, jacket with high tension materials like carbon fibre, glass fibre etc. Retrofitting comparative study of rc jacketing and frp wrapping article pdf available in international journal of civil engineering and technology 75. Retrofitting existing concrete elements by method of jacketing solutions horse construction business range tend to all over the world and service for thousands clients with products, technical,construction specialized guidance, and we witness the chinese reinfocing brands togther with them. It is well known that the success of this procedure is dependent on the monolithic behavior of the composite element.
In design process we must take two important points in considerations. Research article materials and jacketing technique for. Thus, the strength of the structures can be moderately or significantly increased and the ductility can be improved. Pdf retrofitting comparative study of rc jacketing and. No displacements, cracks or adherence loss between columns and jacketing was noticed, even though no. Disadvantages increase in the concrete member size obtained after the jacket the need to construct a new. Neglecting slip effects in plates and reinforcement bars, contact elements used to simulate them is. Unlike the other mentioned techniques, external prestressing is an active strengthening technique.
Repair and strengthening of reinforced concrete structures. The plates can be tied to column using epoxy, anchor bolts or both of them. Fixit micro concrete is supplied as a ready to use dry powder which requires only addition of clean water at site to produce a free flowing non shrink repair micro concrete. However, the formwork of the soffit shall be retained and removed after 3 days. Four full scale beams were first loaded to certain levels of ultimate capacity 0, 60%, 77%, 100% of failure load. This material has similar properties as the concrete in existing structures. The finite element method 6th edition volume 1,2,3 complete set by o. Concrete can be made from local resources and processed near a jobsite. Ultrahigh performance concrete is a cementitious material that has a much. Reinforced concrete jacketing interface influence on cyclic loading response article pdf available in aci structural journal 1054. Reinforced concrete jacketing interface influence on monotonic loading response article pdf available in aci structural journal 1022.
Research article materials and jacketing technique for retrofitting of structures shri. Properties of concrete concrete is an artificial conglomerate stone made essentially of portland cement, water, and aggregates. Solutions for bond improving of reinforced concrete columns. Use a rasp or file to file away the concrete at the desired location. The term concrete refers to a mixture of aggregates, usually sand. Commentary 1 the fundamentals of ordinary design and construction of concrete structures are covered in the standard. A rasp or file coated with tungsten carbide or diamond bits will make the work go faster. The original japanese version of the guidelines is accompanied by manuals and design examples of each retrofitting method covered by the guidelines. Pdf reinforced concrete jacketing interface influence. Concrete is an artificial stone which is obtained after hardening the homogenous mixtures of cement, water, aggregates and sometime admixture andor additive to modify the fresh and hardened concrete. He is also a fellow of astm, and the engineering institute of canada.
Additional reinforcements provided for jacketing strengthening of column with micro concrete 3. Files are added to the concrete5 file manager in the dashboards file manager page or through the file manager overlay while editing content on a website. A new steel jacketing method for rc columns article pdf available in magazine of concrete research 6110. It was named portland cement because it looked like the.
Materials for concrete repair, replacement and jacketing. Thompson, concrete materials and teaching for mathematical understanding, arithmetic teacher 419 1994 556558. Three beams are made as a the third set and repaired by epoxy resin plates. Received april 27, 2009 accepted may 5, 2009 concrete jacketing is a commonly used method to retrofit or strengthen. The steel wrapping jackets increased the peak strength and ductility of the concrete by providing external con. Jacketing has been considered as one of the important methods for strengthening and repairing of rc beams. Water must be clean, fresh and free from any dirt, unwanted chemicals or. Files are typically media uploaded to the file manager in order to be placed in an image block, linked to in an instance of the rich text editor, placed for download using the file block, etc each file uploaded to the concrete5 file manager has a particular file type jpeg, doc, mpeg, which itself has a particular generic type e.
The process involves stamping the concrete with some or no color, then waiting until the concrete has set to postcolor or highlight the work. Special concretes pdf in the general use of the word concrete, the idea implied is the conventional. Strengthening of reinforced concrete rc beams is required due to design errors, deficient concrete production, bad execution processes, damage due to earthquake, accidents such as collisions, fire, explosions and situations involving changes in the functionality of the structure etc. Retrofitting existing concrete elements by method of jacketing. Admixtures admixtures are mixed into the concrete to change or alter its properties, ie the time concrete takes to set and harden, or its workability. Silva a a department of civil engineering, faculty of science and technology, university of coimbra portugal b department of civil engineering, instituto superior tecnico, technical university of lisbon, portugal. Types of jacketing reinforced concrete jacketing steel jacketing fiber reinforced polymer composite jacket jacket with high tension materials like carbon fiber, glass fiber etc. This method is evaluated according to different characteristics and, in order to help structural engineers to choose the most appropriate solutions, recommendations are given, based on published experimental research and real case studies. Effect of steel wrapping jackets on the bond strength of. Alan sembera began writing for local newspapers in texas and louisiana. Dsc employs over 40 personnel comprising engineers, technicians and skilled laborers to deliver best in class services on a scale never previously achieved in the local market.
Pdf reinforced concrete jacketing interface influence on. Why more installers are using the postcoloring method. Strengthening such elements is a method to increase the earthquake resistance. Jacketing and collars for concrete column beam strengthening. Introduction to repair and strengthening of reinforced concrete structures 1. Strengthening rc columns with ultra high performance concrete inyeong koo1 and sunggul hong2.
Concrete basics a guide to concrete practice contents foreword page 2 chapter 1 concrete materials pages 35 chapter 2 concrete properties pages 69. Overriding core files and extending core classes in. Then, after formation of cracks or failure, they were repaired by reinforced concrete jacketing method and tested again up to failure. Steel jacketing does not increase significant weight of column and also saves construction time curing. For this reason, it leads to a reduction of deflections, stresses, and cracks in structural members. Ultrahigh performance concrete is a cementitious material that has a much higher compressive strength than normal concrete and also has a worthwhile tensional.
Astm e51404, standard test method for water penetration and leakage through masonry. Physical salt attack on concrete, part 2 aci spring 2012 convention march 18 21, dallas, tx r. Waghmare address for correspondence acharya shrimannarayan polytechnic,piprim, wardha maharashtra abstract seismic protection of buildings is a needbased concept aimed to improve the performance of any structure under future earthquakes. Taylor structural mechanics of buried pipes by reynold king watkins, loren runar anderson prestressed concrete analysis and design fundamentals 2nd edition by antoine e. This is a commonly used material for replacement and jacketing of concrete as well as masonry structures. Files are typically media uploaded to the file manager in order to be placed in an image block, linked to in an instance of the rich text editor, placed for download using the file block, etc.
Effectiveness of various methods of jacketing for rc beams. No displacements, cracks or adherence loss between columns and jacketing was noticed, even though no interface preparation methods. This is a cementitious material, with additives, which impart controlled expansion characteri stics in the plastic. Effect of steel plate jacketing of columns in seismic.
Mechanical performance and applications ahmed elbadawy sayed, assoc. From an environmental standpoint, concrete has a lot to offer the ingredients of concrete water, aggregate, and cement are abundant. North american specification for the design of coldformed steel structural members 2001. Inspect all materials used in the construction of concrete work at their source, on the job, or both.
Solutions for bond improving of reinforced concrete. Move the rasp or file in a back and forth motion along the surface of the concrete, applying downward pressure. Strengthening rc columns with ultra high performance. Dont use sea water as it may rust the steel reinforcement in the concrete. Design parameters wall geometry when planning a recon retaining wall, the most logical place to start is the wall location and where it resides with reference to the.
Jacketing is the most popularly used method for strengthening of building columns. When, why and how to rehabilitate a structure when. Astm e330, test method for structural performance of exterior windows, curtain walls and doors by uniform static air pressure difference. Is flowing concrete the same as selfconsolidating concrete. Anderson award winner, and a member of numerous aci committees including c232 on fly ash and c201 on durability. The shuttering from the sides of the r c members shall be removed after a period of 24 hours. These materials are cheap and do not require any special skilled workmen for repair works. Neglecting slip effects in plates and reinforcement bars, contact elements used to simulate them is tie and embedded region contact type respectively. You can file concrete to give it a more finished appearance, smooth out rough edges or even to create artistic sculptures. We use stateoftheart technologies and machinery that enable us to carry out any jobs related to. With this method, axial strength, bending strength, and stiffness of the original column are increased. Jacketing is the process whereby a section of an existing structural member is restored to original dimensions or increased in size by encasement using suitable materials.
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