Free expansion stresses are not created on the surrounding concrete. Materials for concrete repair, replacement and jacketing. Neglecting slip effects in plates and reinforcement bars, contact elements used to simulate them is tie and embedded region contact type respectively. The shuttering from the sides of the r c members shall be removed after a period of 24 hours. Mass concrete is any extremely large volume of concrete, such as in a dam, where special measures have to be taken to minimize cracking from the heat generated by. The basic ratio of water to cement determines the strength of concrete. Repair and rehabilitation structural rehabilitation of.
Reinforced concrete jacketing is one of the most frequently used methods for. Procedure of rc jacketing it can be employed as a repair or strengthening scheme. With this method, axial strength, bending strength, and stiffness of the original column are increased. Repairing and strengthening methods for rc structural members. 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. Jacketing consists of added concrete with longitudinal and transverse reinforcement around the existing column. When, why and how to rehabilitate a structure when. Effect of steel plate jacketing of columns in seismic. Strengthening rc columns with ultra high performance. All content included on our site, such as text, images, digital downloads and other, is the property of its content suppliers and protected by us and international laws. Effect of steel wrapping jackets on the bond strength of concrete and the lateral performance of circular rc columns eunsoo choia,1, youngsoo chungb,2, kyoungsoo parkc, jongsu jeond. Strengthening rc columns with ultra high performance concrete inyeong koo1 and sunggul hong2. This article journal is brought to you for free and open access by scholars.
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. Water must be clean, fresh and free from any dirt, unwanted chemicals or rubbish that may affect concrete. Mix further for 2 minutes till lump free mix is obtained additional reinforcements provided for jacketing strengthening of column with micro concrete 3. Strengthened columns appeared to work as monolithic structures. Research article materials and jacketing technique for. The finite element method 6th edition volume 1,2,3 complete set by o. Introduction to concrete portland cement association. No displacements, cracks or adherence loss between columns and jacketing was noticed, even though no interface preparation methods. 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. Thus, the strength of the structures can be moderately or significantly increased and the ductility can be improved. The sizes of the sections are increased and the free available usable. Introduction to repair and strengthening of reinforced concrete structures 1.
Effect of steel wrapping jackets on the bond strength of. Jacketing has been considered as one of the important methods for strengthening and repairing of rc beams. 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. Peurifoy late consulting engineer austin, texas garold d. Download fulltext pdf reinforced concrete jacketing interface influence on cyclic loading response article pdf available in aci structural journal 1054. 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. Pdf reinforced concrete jacketing interface influence on. Nanotechnology in concrete materials figure 1 the topdown and bottomup approaches in nanotechnology 1 sanchez and sobolev, 2010. Nanosio 2 not only behaved as a filler to improve the microstructure but also as an activator to promote pozzolanic reactions. Warner date 2010 publisher pearson education australia pub place frenchs forest, nsw. The porous zone around the reinforcement is filled by rust products. Research article materials and jacketing technique.
This comprehensive concrete manual has both the triedandtested methods and materials, and more recent innovations. Strengthening rc columns with ultra high performance concrete. The jacketing of rc beams was done by using additional reinforcement and for connection between lateral and longitudinal. Detailing procedures for seismic rehabilitation of. Too much water dilutes cement paste binder, resulting in weak and porous concrete. Neglecting slip effects in plates and reinforcement bars, contact elements used to simulate them is. Thus the basic concept behind nanomodification of materials is that of bottomup. About four tons of concrete are produced per person per year worldwide and about 1. It covers everything you need to know about concrete along with styrofoam forming systems, fiber reinforcing adjuncts, and some architectural innovations, like architectural foam elements, that can help you offer more in the jobs you bid on. Building code requirements for structural concrete aci 31811 and commentary first printing august 2011 isbn 9780870317446 american concrete institute. Aci structural journal technical paper following previous studies, the authors describe an experimental study performed to analyze the influence of the interface treatment on the seismic behavior of columns strengthened by reinforced concrete rc jacketing to increase their ultimate bending moment.
In design process we must take two important points in considerations. Taylor structural mechanics of buried pipes by reynold king watkins, loren runar anderson prestressed concrete analysis and design fundamentals 2nd edition by antoine e. We use stateoftheart technologies and machinery that enable us to carry out any jobs related to. This material has similar properties as the concrete in existing structures. Introduction to concrete concretess versatility, durability, sustainability, and economy have made it the worldss most widely used construction material. The steel wrapping jackets increased the peak strength and ductility of the concrete by providing external con. Spherical nanosio2 particles of uniform distribution observed using fig 2. Inspect all materials used in the construction of concrete work at their source, on the job, or both. Then, after formation of cracks or failure, they were repaired by reinforced concrete jacketing method and tested again up to failure. Type book authors stephen foster, andrew eric kilpatrick, r. 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. Pdf retrofitting of existing rcc buildings by method of jacketing.
The less water in the mix, as long as it is workable and not too stiff, the stronger, more durable, and watertight the concrete. Figure 4 repair procedure with the hybrid confining jacket. The plates can be tied to column using epoxy, anchor bolts or both of them. The principle of this is that we determine the proportion of cement whose grain size is larger than specified mesh size. Ebook reinforced concrete basics as pdf download portable. Disadvantages increase in the concrete member size obtained after the jacket the need to construct a new. The term concrete refers to a mixture of aggregates, usually sand. Solutions for bond improving of reinforced concrete columns.
No displacements, cracks or adherence loss between columns and jacketing was noticed, even though no. Retrofitting is the modification of existing structures to make them more resistant. In order to prevent this, different seismic retrofitting has been thoroughly researched including steel jacketing of tied reinforced concrete rc column. A new steel jacketing method for rc columns article pdf available in magazine of concrete research 6110. Ultrahigh performance concrete is a cementitious material that has a much. These materials are cheap and do not require any special skilled workmen for repair works. Pdf retrofitting comparative study of rc jacketing and. This is partly due to the nondestructive inspection method for concrete filling which has yet to be established. 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. Grading of the sand is to be such that a mortar of specified proportions is produced with a uniform distribution of the aggregate. Solutions for bond improving of reinforced concrete. Test to check fineness of cement fineness so we need to determine the fineness of cement by dry sieving as per is.
It is well known that the success of this procedure is dependent on the monolithic behavior of the composite element. 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. This is a cementitious material, with additives, which impart controlled expansion characteri stics in the plastic. 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.
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. Jacketing is one of the most frequently used techniques to strengthen reinforced concrete rc columns. Research article materials and jacketing technique for retrofitting of structures shri. Ultrahigh performance concrete is a cementitious material that has a much higher compressive strength than normal concrete and also has a worthwhile tensional. Introduction repairing of reinforced concrete elements is required after a damage. Three beams are made as a the third set and repaired by epoxy resin plates. Schematic view of steel plate jacketing of columns in connections is shown in figure 8. The type of structure must be classified as either mass or structural. Water used in the mixing is to be fresh and free from any. Retrofitting existing concrete elements by method of jacketing.
Detailing procedures for seismic rehabilitation of reinforced. More recently, however, hybrid jacketing, which essentially combines the advantages of different retrofitting methodsmaterials, has become. The effect of surface preparation and the mismatch of the moduli of the repair material and substrate were studied. When it can be determined that the length of the concrete core is not deficient more than 5 mm 0. Effectiveness of various methods of jacketing for rc beams. Reinforced concrete basics top results of your surfing reinforced concrete basics start download portable document format pdf and ebooks electronic books free online rating news 20162017 is books that can provide inspiration, insight, knowledge to the reader. Reinforced concrete jacketing interface influence on cyclic loading response article pdf available in aci structural journal 1054. Tex424a, obtaining and testing drilled cores of concrete. This is a commonly used material for replacement and jacketing of concrete as well as masonry structures. E116, aggregates for concrete free download e200, reinforcement for concrete free download e3, cementitious materials for concrete free download e412, chemical admixtures for concrete free download seminar lecture notes concrete production ordering and basis of sale production facility delivery issues resolving disputes.
Design of reinforced concrete free pdf, chm, fb3, txt. Repair and strengthening of reinforced concrete structures. Different researchers have employed various methods of jacketing for reinforced concrete rc elements 15. Pdf reinforced concrete jacketing interface influence. The original japanese version of the guidelines is accompanied by manuals and design examples of each retrofitting method covered by the guidelines. His research interests widely cover mechanics of reinforced concrete structures. Strengthening such elements is a method to increase the earthquake resistance. Strengthening and repair of reinforced concrete columns. But amount of corrosion products is less than the amount of corrosion products required to fill the porous zone around the steelconcrete interface w p. Jacketing is the most popularly used method for strengthening of building columns. Retrofitting of existing rcc buildings by method of jacketing mlmce 1 civil. Oberlender professor emeritus oklahoma state university. Chapter 4 concrete tex424a, obtaining and testing drilled cores of concrete manual of testing procedures 4 0899 0500 note 2.
972 1275 864 1351 356 477 892 530 783 1278 682 450 255 1603 1425 76 1173 1537 1467 996 1390 642 1063 32 816 972 467 952 427 133 1133