Ferro cement jacketing is one of the alternate method of repair and strengthening of column which is low cost and easy to apply to existing column, as doityourself diy. Concrete jacketing is a popular method of retrofit as it follows the same design and construction procedures of rc columns and the jacket can provide protection from both environmental effects and fire. Rc jacketing is a very effective strengthening method that allowed us to achieve up to 290% of strength increase. The load carried by the column is increased due to either increasing the number of floors or due to mistakes in the design. Here is the method statement for footing concrete pouring. Jacketing consists of added concrete with longitudinal and transverse reinforcement around the existing column. 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. Then, after formation of cracks or failure, they were repaired by reinforced concrete jacketing method and tested again up to failure. This comprehensive concrete manual has both the triedandtested methods and materials, and more recent innovations. Pdf reinforced concrete rc jacketing is most frequently used to strengthen columns. Khaloo2 1msc, sharif university of technology 2 distinguished professor, sharif university of technology corresponding authors email. There are many different kinds of repair ing and strengthening techniques in literature.
Structural repair and strengthening of rc elements with concrete. Repair and strengthening of reinforced concrete structures. Concrete cracking solution, concrete floor repair, concrete foundation repair, concrete large cracks, concrete repair, crack in foundation, cracked concrete, damaged concrete, damaged concrete repairing, epoxy concrete. Jacketing and collars for strengthening of concrete structures 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. Jacketing is the most popularly used method for strengthening of building columns. Research article materials and jacketing technique for. A common strengthening technique for reinforced concrete structures consists of jacketing the member by adding new concrete to its sides increasing the size and resistance of the cross section. Thus, the strength of the structures can be moderately or significantly increased and the. Retrofitting of existing rcc buildings by method of jacketing. This study aimed at investigating the effectiveness of strengthening the entire height of downscaled square rc columns by applying forta ferro polypropylene fibrous ultra high performance self compacting concrete fibrous uhpscc as a jacketing material. Guidelines for external prestressing as strengthening technique for concrete structures pedro b. Reinforced jacketing, carbon fiber and reparation with steel plates are the ones that are used the most. Effect of steel plate jacketing of columns in seismic behavior of concrete beamcolumn connections m.
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. Research article materials and jacketing technique for retrofitting of structures shri. Replacement of concrete is done for damaged structural members. Also the strengthening methods applied to the beams in this study are examined and tested in various studies. The form and pump technique allows use of different materials. Static analysis is carried out and load carrying capacity, loaddeflection behavior and failure pattern will. Strengthening and repair of reinforced concrete columns by. Four full scale beams were first loaded to certain levels of ultimate capacity 0, 60%, 77%, 100% of failure load.
Received april 27, 2009 accepted may 5, 2009 concrete jacketing is a commonly used method to retrofit or strengthen. Concrete jacket construction detail effectiveness when. Pdf sustainability necessitates the protection of infrastructure from any kind of. Findotek date rev no prepared by checked by approved by remarks. With this method, axial strength, bending strength, and stiffness of the original column are increased. This paper introduces a new steel jacketing method for reinforced concrete rc columns with lap splice and evaluates its performance by a series of axial tests of concrete cylinders. Finite element modeling, concrete damage plasticity, steel plate jacketing, joints, cyclic.
There are difficulties in joining two plates by buttwelded. Repair materials are mixed and pumped into the cavity. The rc jacketing strengthening method is characterized by some important advantages. One of the most commonly used strengthening techniques for structural elements is concrete jacketing. Combining the shcc and a small amount of steel reinforcement. Seismic retrofit of columns using basalt mesh reinforced. The jacketing of rc beams was done by using additional reinforcement and for connection between lateral and longitudinal. Strengthening column using micro concrete jacketing. Faculty of engineering, al azhar university nasr city, cairo, egypt abstract in the present study, the steel jacketing technique with variable vertical angles size. Hasan shirazi pe, bsc ceng follow civil engineering consultancy work in.
Placing prestressing wires and prestressing stranded steel wires in place of lateral ties around the periphery of existing member sections and using mortar and concrete to bond them in order to reinforce the structure. At first, 45 concrete cylinders were fabricated with varying design compressive strengths of 21, 27 and 35 mpa and. Now by tapping with a light hammer, identify of loose concrete portions are present. Prior to the placing of any concrete all quality checks are to be completed and the approval to concrete instruction issued by clientconsultant. Strengthening rc columns with ultra high performance concrete. The overlaying and jacketing construction method is a retrofitting method in which concrete sections are added and corresponds to 2 overlaying construction method and 3 jacketing construction method in the figure. By means of analyzing disadvantages of appraisal reliability and combining with.
Fixit micro concrete for a dry substrate, it should be primed by applying one coat of dr. The purpose of this method statement is to describe the measures and ways of completing concrete pour work for footings on this project. In buildings, concrete is used for footings, foundations, columns, beams, girders, wall slabs, and roof unitsin short, all important building elements. There are several techniques which are used to strengthen reinforced concrete columns like reinforced concrete jacketing, steel jacketing, and frp confining or jacketing. Due to a additional load on an existing isolated footing, im trying to widen and reinforce it by using the jacketing technic, using two orthogonal beams as per the attachementmy question is about new beams reinforcement. Columns are weaker than their joining beam weak columnstrong beam. Concrete has a great variety of applications because it not only meets structural demands but also lends itself readily to architectural treatment. The works shall be carried out in compliance with the drawings and project. Chapter 2 section enlargement and concrete jacketing. Strengthening of reinforced concrete column via ferrocement. Commentary 1 the fundamentals of ordinary design and construction of concrete structures are covered in the standard. Strengthening rc columns by jacketing using ultra high. At first, 45 concrete cylinders were fabricated with varying design compressive strengths of 21.
Structures with polymer modified concrete suresh chandra pattanaik phd student, kiit university, bhubaneswar and team head advanced diagnostic laboratory, dr fixit institute of structural protection and rehabilitation, copidilite industries limited, mumbai. These situations may require additional concrete elements or the entire concrete structure to be strengthened, repaired or retrofitted. Fig5 strengthening of the existing column by providing rebars around its periphery for concreting. Method statement for footing concrete pouring method. Ijett steel jacketing technique used in strengthening. A comparative study of building strengthening methods to have an. The question to be answered was how the effectiveness of the technique alters when common as used in practice procedures are performed.
In traditional reinforced concrete jacketing, the section of the column is. 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. Apr 07, 2018 strengthening column using micro concrete jacketing remove entire plaster to reach parent concrete surface if the column is plaster. Strengthening rc columns with ultra high performance concrete inyeong koo1 and sunggul hong2 1, 2 department of architecture, snu, seoul, korea. Retrofitting of existing rcc buildings by method of jacketing mlmce 1 civil engineering. Steel jacketing technique used in strengthening reinforced concrete rectangular columns under eccentricity for practical design applications ezzeldeen, h. Method statement for concrete works method statement hq. Effect of steel plate jacketing of columns in seismic. The method is applicable for protecting concrete, steel, and timber sections against further deterioration and for strengthening. Section enlargement is one of the methods used in retrofitting concrete members. Concrete basicsaims to provide a clear, concise explanation of all aspects of making quality concrete. Reinforced concrete mortar jacketing rc jacketing has been used extensively for strengthening and repairing deficient and damaged rc columns, respectively.
Every year, new materials, equipment, and building techniques are introduced. A comparative study of building strengthening methods to. The methods such as steel and concrete jacketing and application of fibre reinforced polymer frp composites which were used to improve. The development of these methods was a necessity due to different causes, such as inadequate maintenance, overloading of the reinforced concrete member, corrosion of the steel reinforcement and other different situations that appeared in time. Seismic load test strengthened by concrete jacketing a columns. Repair and rehabilitation structural rehabilitation of. Introduction to repair and strengthening of reinforced concrete structures 1. Behavior of reinforced concrete columns strenghtened by. Reinforced concrete jacketing interface influence on monotonic loading response. Request pdf structural repair and strengthening of rc elements with concrete. Jacketing of rcc columns with concrete published on july 3, 2017 july 3, 2017 75 likes 29 comments. Reinforced concrete jacketing is a current strengthening method of reinforced concrete columns. Experimental investigation of reinforced concrete columns strengthened by jacketing pavlo krainskyi, zinoviy blikharskiy, roman khmil, department of civil engineering national university lviv polytechnic lviv, ukraine abstracteach year the significance of structural rehabilitation in construction industry increases.
Pdf strengthening and repair of reinforced concrete columns. Nowadays, repairing and strengthening of damaged reinforcedconcrete buildings has become an important issue. In this study three methods of joint strengthening will be discussed. Pdf reinforced concrete jacketing interface influence. Ultrahigh performance concrete is a cementitious material that has a much. Widening and strengthening of existing foundations may be carried out by constructing a concrete jacket to the existing footings. A new steel jacketing method for rc columns magazine of. During and immediately after the concrete casting, the vibrating operation is important to achieve a good quality of the jacket. Concrete can be made from local resources and processed near a jobsite. They are old existing building designed without earthquake code in.
Jacketing has been considered as one of the important methods for strengthening and repairing of rc beams. Prestressed concrete jacketing construction method. Experimental investigation of reinforced concrete columns. Jacketing of reinforced concrete rc columns is a technique widely adopted in current engineering practice to retrofit existing weak members and increase their strength and ductility. Cost of concrete jacket strengthening reinforcement cost. Method of statement construction of flat concrete floor for. Global methods concentrate at the structure level and retrofit to obtain a better. The figure 1 a demonstrates beam plated on the tension side. This experimental study aims in assessing the behavior of such reinforced concrete columns confined with external reinforced concrete jacketing technique. Paper open access strengthening method of concrete. A comparative study of retrofitting of beam column joint. Retrofitting is the modification of existing structures to make them more resistant. It is well known that the success of this procedure is dependent on the monolithic behavior of the composite element.
Ongoing activities for future updates of the aci standard. Deflections along the column length as well as crack development were also monitored. The aim of this study is to investigate and compare the applications of strengthening methods such as frp, shear wall, concrete jacketing and steel plating on a typical building selected from the building stock. Repair and strengthening of reinforced concrete beams honors. Strengthening reinforced concrete columns by jacketing. Jacketing is particularly used for the repair of deteriorated columns, piers, and piles and may easily be employed in underwater applications. 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. Saturate the substrate with water to prevent absorption of water from the mixed material of dr. The traditional rc jacket is usually applied to the rc column by casting a concrete layer reinforced with steel bars and ties or with welded wire fabric around the column. Pdf repair and strengthening of reinforced concrete beam. Abstract in the present study, the steel jacketing technique with variable vertical angles size connected with horizontal steel straps is used to upgrade the load carrying capacity of rectangular reinforced concrete columns under eccentric loads. Strengthening rc columns with ultra high performance concrete inyeong koo1 and sunggul hong2.
Finite element method was used to investigate the performance of the building during the earthquake and to check the behavior of the structure after applying retrofitting techniques. Aci committee 369 now updates the concrete provisions of ascesei 41 published under aci 369. A space between the jacket and the joining member, to avoid. Reinforced concrete jacketing, fixing with steel plates and carbon fiber procedures are. Concrete basicsaddresses the needs of unskilled and semiskilled persons undertaking general concreting projects including home and handyman projects. Ongoing activities for future updates of the aci standard 369. The primary methods compared are reinforced concrete jacketing and. There are two processes for applying sprayed concrete dry mix sprayed concretein which most of the mixing. Strengthening and repair of reinforced concrete columns. Experimental and analytical analysis of reinforced concrete columns. The aim of this paper is to explain a method on how to strengthen a concrete building structure that people can uselearn as a better way to cut potential cost and save time. The reinforced concrete jacketing has been considered as one of the.
Research article materials and jacketing technique. Strengthening of reinforced concrete structure elements using concrete jackets 3. The method consists in casting a rc layer jacket around the column, in order to increase the confinement effect on the member andor enlarge the cross section. It improves axial and shear strength of column and major strengthening of foundation may be avoided.
The original japanese version of the guidelines is accompanied by manuals and design examples of each retrofitting method covered by the guidelines. Retrofit of reinforced concrete columns the ohio state university. Guidelines for external prestressing as strengthening. Ultrahigh performance concrete is a cementitious material that has a much higher compressive strength than normal concrete and also has a worthwhile tensional. Sprayed concrete shotcrete it is one of the oldest materials and the most common techniques of repairing and strengthening of reinforced concrete structures sprayed concrete has been used in that field for almost 90 years. Strength and ductility are substantially improved regardless of the method used to fix the jacket to the concrete. Measurements were taken from jacketing and strengthened columns. These methods include concrete, steel, and fiber reinforced polymer frp jackets. Jacketing of reinforced concrete columns with steel longitudinal angles and transversal plates is a suitable method for retrofitting columns.
It is well known that the success of this procedure is dependent on. Mechanical performance and applications ahmed elbadawy sayed, assoc. Strengthening rc columns with ultra high performance. Materials for concrete repair, replacement and jacketing. Introduction repairing of reinforced concrete elements is required after a damage. In design process we must take two important points in considerations. For a column strengthened using jacketing it is important to guarantee stress transfer at the new concrete old concrete interface. Strengthening column using micro concrete jacketing remove entire plaster to reach parent concrete surface if the column is plaster. Behavior of reinforced concrete columns strengthened by. A hydraulic contenco l3001b manual press was used to test both the.
From an environmental standpoint, concrete has a lot to offer the ingredients of concrete water, aggregate, and cement are abundant. Enlargement is the placement of reinforced concrete jacket around the existing structural member to achieve the desired sectional properties and performance. Repairing and strengthening methods for rc structural members. The materials used for concrete repair works such as replacement and jacketing of concrete structural members should have good bonding properties with the existing materials and should be nonshrinking. Effectiveness of various methods of jacketing for rc beams. Evaluation and comparison of strengthening methods to deliver a. 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. Concrete is an ideal medium for recycling waste or industrial byproducts. Common methods for strengthening columns include concrete jacketing, fiber reinforced polymer frp jacketing and steel jacketing. The jacket can increase the axial and flexural strength through increasing confinement. Pdf reinforced concrete jacketing interface influence on.
Different researchers have employed various methods of jacketing for reinforced concrete rc elements 15. Jacketing is one of the most frequently used techniques to strengthen reinforced concrete rc columns. Pdf retrofitting of existing rcc buildings by method of. Following presents fig5 the technique of concrete jacketing being applied on the rc column. Enlargement is the placement of reinforced concrete jacket around the existing structural member to achieve the desired section properties and performance. Solutions for bond improving of reinforced concrete columns.
The strengthening method explained in this paper is steel jacketing, providing a case study of this method in the extension of a restaurant located in medan, indonesia. The effect of surface preparation and the mismatch of the moduli of the repair material and substrate were studied. 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. In traditional reinforced concrete jacketing, the section of the column is enlarged by casting a new reinforced concrete mortar section over a part or the entire length of the column. Seismic retrofit of columns using basalt mesh reinforced sprayed grc jacket page 3 of 7 application of the retrofitting method first stage of the retrofitting aims to form an appropriate concrete surface for the jacketing and for this purpose the surface should be cleaned figure 1a. It shows advantages particularly in seismic retrofitting, since it enhances strength, ductility and consequently the energy. Jacketing and collars for concrete column beam strengthening. Concrete overlaying method manual among the individual methodology manuals in. Method statement for damaged cracked concrete repair of large. 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. Civil engineering methods construction method statements method statement for civil works method statements tags. Strengthening such elements is a method to increase the earthquake resistance. In the following paragraphs, this method is assessed according to different aspects. Review of methods for reinforced concrete column retrofit.
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