Methods of Strengthening 1. The second slab was cast to mimic the first but featured an overlay of FRP and UHPC after installing shear connectors. Strengthening techniques were applied on the bottom surface of fifteen slab specimens. 2. The experimental program is composed of three series of three slab strips of two equal span length, in order to verify the possibility of . In this research, efficiency of slab strengthening was judged by comparing the behavior of strengthened specimens from the point of view of cracking and ultimate loads, cracking mechanism . new openings but with strengthening of the slab required there are several common strengthening methods that can be considered. Generally showed web-shear strength in end regions is much less than the one predicted by (ACI 318-14), V cw equation (ACI-22.5.8.3.2). The depth and shear demand limitations were defined on the research results that concluded that prestressed concrete hollow-core slabs with a depth greater than 12.5 in. This paper discusses different techniques for strengthening of R/C slabs against punching: insertion of post-installed shear reinforcement, application of external fibre reinforced polymers or a bonded reinforced concrete overlay (BRCO) on the slab top surface, enlargement of the support, application of a post-tensioning system. Different configurations of the shear bolts around the column were tested. Nowadays, generally new techniques appear in strengthening field. Procedure for strengthening. 49 This paper presents shear strengthening techniques that can be used on existing concrete thick 50 slab structures to improve the shear capacity (Fig. This work aims to study a new flat slab strengthening technique based on post-tensioning with anchorages by bonding using an epoxy adhesive. This paper discusses different techniques for strengthening of R/C slabs against punching: insertion of post-installed shear reinforcement, application of external fibre reinforced polymers or a bonded reinforced concrete overlay (BRCO) on the slab top surface, enlargement of the support, application of a post-tensioning system. Coat the steel bars with an epoxy material that prevent corrosion To assess the efficiency of the hybrid strengthening technique for the increase of flexural load carrying capacity of RC slabs, the slab strip specimens represented in Figure 1 were used. Installing dowels at 25-30cm spacing in both directions using an appropriate epoxy material. There are also some other techniques used for strengthening a reinforced concrete slab such as: Increasing the shear bearing capacity of the slab by adding steel plates strengthened by vertical screw bolts. Key Words: strengthening slab, CFRP products, EBR, RC slab. In order to ensure the durability of the frame beams and columns, a layer of epoxy resin adhesive can be coated on the surface, fine sand can be sprayed, and finally the painting can be completed. This technique of strengtheninghas resulted in a decrease in the RCS maximum deflection by about 21%. Applications of Slab Jacking Technique: Highway maintenance The main advantages of this technique over the traditional prestress strengthening systems that use mechanical anchorages are that it does not need external permanent anchorages, meaning that the forces are introduced into the concrete gradually instead . Experimental results of four-point bending tests, carried out in unstrengthened and strengthened concrete slab strips, are presented and analyzed. slab is strengthened by overlay while in case of positive moment . This paper discusses different techniques for strengthening of R/C slabs against punching: addition of post‐ installed shear reinforcement, gluing external fibre reinforced polymers, casting a bonded reinforced concrete overlay (BRCO) on the slab's top surface, enlargement of the support or application of a post‐ tensioning system. Experimental Work Program 2.1. Removing the concrete cover and after cleaning the reinforcement steel, coating it with the material which will prevent the corrosion. Steps of Isolated Footing Strengthening. slab also increases after BRCO strengthening ( , ), with usually the flexural capacity ( ) also increasing. Updated on a regular basis. The test results showed that both carbon fiber laminates and rods . The flexural members of beams and slabs are strengthened by insufficient bearing capacity, including two aspects of the positive and inclined section.The appearance of insufficient bearing capacity is too large deflection, too wide cracks . The rest three specimens were strengthened using three different techniques Glass Fiber . This work aims to study a new flat slab strengthening technique based on post-tensioning with anchorages by bonding using an epoxy adhesive. advantages and disadvantages of slab jacking techniques, how . On the strengthened slab, the FRP was installed on top of the slab, which is the compression side. However, most of the studies have focused on the strengthening of RC beams [7-10] or slab strips [11-15]. To assess the effectiveness of the near surface mounted (NSM) technique, in terms of load carrying and moment redistribution capacities, for the flexural strengthening of continuous reinforced concrete (RC) slabs, an experimental program was carried out. Strengthening Of Steel Structures With Fiber Reinforced Polymer Posites Sciencedirect. It is also required to relieve stresses generated by design or construction errors or for the restoration . EBR technique offers several structural advantages when the CFRP material is prestressed. Steel Plated Concrete Posite Technique And Ering Lications . By using the CFRP sheet in RC slab increased the flexural ultimate load caring capacity of the central, The design load capacity is the planned capacity specifically used for design purposes. But when only the holes are to be filled, it is called 'pressure grouting'. V-Wrap™ FRP Composite Systems; Strengthening with Post-Tensioning; Tstrata Enlargement Systems™ DUCON® Micro-Reinforced . Stay Cables; Cable Armor; Bridge Armor; Force Protection; Construction Systems. Design Services All these strengthening techniques require careful consideration of the existing and desired loading regimes to establish what strengthening methods are feasible and to determine an economic and technically appropriate design. To assess the efficiency of the hybrid strengthening technique for the increase of flexural load carrying capacity of RC slabs, the slab strip specimens represented in Figure 1 were used. Strengthening a slab by increasing its depth from the bottom. The used method depends on several factors, such as the strengthening required, the location where strengthening is required, and architectural requirements. CFRP sheets were installed on the tension side of the slab to increase the flexural capacity at the negative moment region. This research was focused on studying three of the most popular innovative slab strengthening techniques: GFRP sheets, carbon fiber laminate strips, and near surface mounted steel rebars. As the blows continue, the impact force tends to decrease, which indicates a reduction in the bearing strength of the test specimen. His initial foray in the sleep field involved applying machine learning and signal processing techniques on EOG data to detect the presence of Rapid Eye Movements. 3.1 Strengthening Techniques for RC Slabs with Cut-Outs Poor construction supervision. Strengthening a slab by increasing its depth from top . It was found that the single-web PHC slab The first specimen slab had no strengthening and considered as a control and the other six specimens were strengthened with either different embedded lengths of near-surface mounted bars; or using . It was conducted by a former master student (Wu, 2015). This paper presents an experimental and numerical study on reinforced (RC) slabs strengthened in flexure with prestressed CFRP strips as . The first slab was an unstrengthened concrete slab which was used as a control. Remove the concrete cover. This technique is used on vertical surfaces such as walls, columns and other combinations . REVIEW OF STRENGTHENING TECHNIQUES USING EXTERNALLY BONDED FIBER REINFORCED POLYMER COMPOSITES Report 2002-005-C-01 The research described in this report was carried out by Project Leader Dr. Sujeeva Setunge Team members Prof. Arun Kumar, Dr. Abe Nezamian and Dr Saman De Silva (RMIT) Dr. Alan Carse, Mr. John Spathonis and Ms. Louise Chandler (QDMR) Mr. Dale Gilbert (QDPW) Mr. Bruce Johnson . The cross section dimensions and the test set up of the tested slab strip specimens are also illustrated in Figure 1. Making holes the whole span of beam and to the full width under the slab with a spacing of about 150-250mm. A thin UHPC overlay was cast above the FRP, forming an effective composite where the UHPC resisted all of the . reinforcement strengthening technique [5,6], and the results have shown the effectiveness of this technique in improving the flexural and shear behavior of RC structural members. 3.1 Strengthening Techniques for RC Slabs with Cut-Outs The . Bonded Slab Post-Tensioning; Stay Cable Systems. 49 This paper presents shear strengthening techniques that can be used on existing concrete thick 50 slab structures to improve the shear capacity (Fig. The authors . Its strength depends on the strengthening layer thickness, the cement mortar strength, the reinforcement quantity and the means of its bonding with the retrofitted wall. Strengthening a slab by increasing its depth from top . The reaction force represents a load . 2). In recent years, several researchers have been studying the use of FRP sheets or laminates to strengthen concrete structural members. In this research, efficiency of slab strengthening was judged by comparing the behavior of strengthened specimens from the point of view of cracking and ultimate loads, cracking mechanism, and mode of failure. Different techniques have been developed for strengthening R/C slabs against punching: enlargement of the support, gluing external fibre reinforced polymers or casting a bonded concrete overlay (BCO) on the slab's top surface, insertion of post-installed steel bolts, application of fibre reinforced polymers cords as shear reinforcement. Though I'm much more knowledgeable now and a much greater scientist, I'm still very proud of this eBook. Coat the steel bars with an epoxy material that prevent corrosion The loading tests performed as well as the 51 comparison between shear capacities of concrete thick slab strips (beams) strengthened and 52 unstrengthened in shear are presented. Four slabs were strengthened and two slabs, used as control specimens, did not contain any shear reinforcement. Structural Strengthening Method Of Beam Column Slab Ponent. hogging B.M.) This suggests that all initial stiffness values are similar regardless of the type of strengthening method used. reinforcement strengthening technique [5,6], and the results have shown the effectiveness of this technique in improving the flexural and shear behavior of RC structural members. Methods of Strengthening 1. 10.3. work in Phases I focused on applying the proposed shear strengthening technique to I-shaped single-web PHC slabs cut out longitudinally from full-width slabs to assess the feasibility and effectiveness of this shear strengthening technique. These methods are used to: Cleaning and roughening the concrete surface. Remove the concrete cover. The authors . experimentally investigated. Clean the reinforcing steel bars using a wire brush or a sand compressor. Strengthening of the slab by post stressed reinforcement. To assess the effectiveness of the NSM strengthening technique to Strengthening Existing Concrete Structures . Introduction One of these slabs was tested as reference (control) specimen. Two of the tested slabs (one strengthened and one control) contained openings in the . In case of negative moment deficiency (i.e. Both slabs were treated as simple beams with a region that contained positive . There are little Structural strengthening method of beam slab component. Strengthening of Slabs on Existing RC Slab || Shotcreting. Jacketing is a method of structural retrofitting and strengthening It is used to increase bearing load capacity following a modification of the structural design or to restore structural design integrity due to a failure in the structural member. Four slabs were strengthened and two slabs, used as control specimens, did not contain any shear reinforcement. In Block III, the section sizes of frame columns are 300 mm *350 mm, 350 mm *350 mm, and the section sizes of frame beams are 250 mm *450 mm and 250 . Many factors affect the rate at which water evaporates from freshly placed concrete. This paper discusses different techniques for strengthening of R/C slabs against punching: insertion of post-installed shear reinforcement, application of external fibre reinforced polymers or a. slab jacking technique, strengthening of interior reinforcing. As depicted in Figure 4, the dashed line represents the behaviour before strengthening. The main advantages of this technique over the traditional prestress strengthening systems that use mechanical anchorages are that it does not need external permanent anchorages, meaning that the forces are introduced into the concrete gradually instead . The flexural performance of the slab can be improved by overlays or underlays. Our in-house team of strengthening experts . In the present work, the combined strengthening strategy, a SFRC overlay and NSM CFRP laminates, was applied to significantly increase the flexural resistance of existing RC slabs. Two unstrengthened RC slabs formed a . Free software for advanced structural design. An experimental program was carried out to investigate the effectiveness of a novel near surface mounted (NSM) technique using innovative manually made CFRP rods (MMRs) and manually made CFRP strips (MMSs) for flexural strengthening of reinforced concrete (RC) two-wayslabs with low clear cover thickness. Clean the reinforcing steel bars using a wire brush or a sand compressor. In the paper, the authors apply the Critical Shear Crack . steel ratio has been increased largely by 671%. This paper discusses different techniques for strengthening of R/C slabs against punching: insertion of post-installed shear reinforcement, application of external fibre reinforced polymers or a bonded reinforced concrete overlay (BRCO) on the slab top surface, enlargement of the support, application of a post-tensioning system. new openings but with strengthening of the slab required there are several common strengthening methods that can be considered. Four full-scale RC slabs (1500×1500×120 mm) were tested under monotonic four-point bending. Free Sika® CarboDur® FRP Design Software. Includes full range of Sika Structural Strengthening Systems. In this research, efficiency of slab strengthening was judged by comparing the behavior of strengthened specimens from the point of view of cracking and ultimate loads, cracking mechanism, and mode of failure. This research was focused on studying three of the most popular innovative slab strengthening techniques GFRP sheets, carbon fiber laminate strips, and near surface : mounted steel rebars. One of the important structural elements is slab which is may crack due to overloading, change of building function, or fabrication errors. 3 Techniques for Efficient Concrete Curing. Structural Strengthening. However, most of the studies have focused on the strengthening of RC beams [7-10] or slab strips [11-15]. STRUCTURAL TECHNOLOGIES offers an extensive line of products and technical services to restore or enhance the load-carrying capacity of reinforced concrete, masonry, timber and steel structures. Two full scale RC slabs were cast and tested to failure; the first as a control and the second using this new strengthening technique. An experimental program was carried out to investigate the effectiveness of a novel near surface mounted (NSM) technique using innovative manually made CFRP rods (MMRs) and manually made CFRP strips (MMSs) for flexural strengthening of reinforced concrete (RC) two-wayslabs with low clear cover thickness. Heavy Lifting, Lowering, & Sliding ; Bridge Erection & Construction Systems; Products for Existing Construction. Strengthening a slab by increasing its depth from the bottom. Four full-scale RC slabs (1500×1500×120 mm) were tested under monotonic four-point bending. Provide additional reinforcing bars, if the loss in reinforcement is more than 10%. 2. The loading tests performed as well as the 51 comparison between shear capacities of concrete thick slab strips (beams) strengthened and 52 unstrengthened in shear are presented. Externally Bonded Reinforcement (EBR) technique has been widely used for flexural strengthening of concrete structures by using carbon fiber-reinforced polymers (CFRP). This strategy consists of applying CFRP laminates on the tensile bottom slab surface, according to the NSM technique, and bonding, with appropriate epoxy-based adhesive, a SFRC layer in the compression top slab surface (see Fig. I wrote this eBook in 2009. Complex calculations in minimum time. From the engineering drawings, specifications of the floor slabs such as the concrete thickness . To validate this novel strengthening technique at the positive moment section of RC slab, two one-way slabs were cast. August 12, 2020 by Sanjay Singh. This is called slab jacking when the slab is to be lifted by pressure injection. Structural strengthening may be required for existing concrete building structures for the increased load capacity of beams, columns, walls, and/or slabs, and for supporting additional live or dead loads not included in the original design. In this article we explain how to do strengthening of existing slabs. Adding steel beams. An isolated footing is strengthened by increasing the size of the footing and the reinforcement steel bars as follows: Excavating around the footing. Concrete beams and slab members are the most widely used structural members in the current project. Apply shortcreting/polymer concrete for patch repair work and grouting for porous/honeycombed concrete. 109-1 10th International Conference on Short and Medium Span Bridges Quebec City, Quebec, Canada, July 31 - August 3, 2018 THICK CONCRETE SLAB BRIDGES: STUDY OF SHEAR STRENGTHENING Fiset, Mathieu1,3, Frédéric, Bédard1, Bastien, Josée1, Mitchell, Denis2 1 Université Laval, Canada 2 McGill University, Canada 3 Mathieu.Fiset.1@ulaval.ca Abstract: Efficient shear strengthening techniques . 2. The . The addition of overlays/underlays will also increase the stiffness of the slabs and control the excessive deflections. 1). 2). 4 Pive Shear Strengthening Methods For Rc Beam A Extra Stirrups Scientific Diagram. There are little Our products can be used stand-alone, or combined together, to solve nearly any project requirement. The new strengthening technique consists of shear bolts externally installed in holes drilled through the slab thickness. Different configurations of the shear bolts around the column were tested. Procedure for strengthening. These holes are filled with cement mortar with low viscosity. 17373. October 4, 2020. The technique of lifting a slab sitting on the soil by pressure ejection grout is called Slab Jacking Technique '. Knowing The Design Load Capacity From The Drawing. This research was focused on studying three of the most popular innovative slab strengthening techniques: GFRP sheets, carbon fiber laminate strips, and near surface mounted steel rebars. Based on international structural codes: ACI 440.2R-17 and ACI 318-14, TR55 and EUROCODE 2 and various local codes. Strengthening of slab. Repair and strengthening applications include column wrapping, beam strengthening, floor slab strengthening, and reinforcement around new openings. This work aims to study a new flat slab strengthening technique based on post-tensioning with anchorages by bonding using an epoxy adhesive. Two general ways to determine the loading of the floor slab, which are: i. Remove all cracked, spalled and loose concrete. As a result, many techniques have been developed to help concrete retain moisture at the early ages. The cross section dimensions and the test set up of the tested slab strip specimens are also illustrated in Figure 1. Support the structural members properly as required. Applying the BRCO on the tensile face of the slab leads to an increase of stiffness and flexural capacity, In addition, the stiffness of RCS has increased and failure due to deflection occurred at 1.75% of the span length. various methods of strengthening of slabs. The used method depends on several factors, such as the strengthening required, the location where strengthening is required, and architectural requirements. This includes air temperature, humidity, concrete temperature, and wind speed. Coming from an engineering background, Ben's work blends Bayesian modeling and machine learning techniques with memory and sleep data. In comparison with the strengthening techniques, the impact force shows a similar strength at the first blow. Clean the exposed concrete surfaces and steel reinforcement. Strengthening Of Reinforced Concrete Beam Rc Methods. More recently, his work on sleep dynamics and big data has quantified the influence of . The main advantages of this technique over the traditional prestress strengthening systems that use mechanical anchorages are that it does not need external permanent anchorages, meaning that the forces are introduced into the concrete gradually instead . In addition, a control slab specimen without any strengthening was used for purpose of comparison. For strengthening of existing structures externally, FRP . Flat slab strengthening techniques against punching-shear Highlights•Punching strengthening is required due to design/construction errors, load increase, etc.•Strengthening techniques are compared using the Critical Shear Crack Theory.•A case study is dealt with to give indications for strengthening pre-dimensioning.•Predicted punching strength of strengthened slabs agrees with . Column was placed under three condition eccentric, centric and edge. connection as a strengthening technique. Two of the tested slabs (one strengthened and one control) contained openings in the . All the strengthening techniques made an enhancement in the ultimate and cracking strength. Using FRPs for strengthening have turned out be an effective technique suitable for several structural elements such as beams, columns, walls, and slab. Please note that we do not accept returns or grant refunds on any of our eBook/digital products. Two unstrengthened RC slabs formed a . The terminology and concepts I coined, including load vector training, as well as the glut The main purpose of injections is to restore the . Texas Strengthening Technologies handles post-tension repairs, slab on grade and elevated, barrier cable-design and installation, carbon fiber design and installation, concrete repair, enlargements, form and pump pressurized form-work, and everything else needed to strengthen your existing concrete structures in North Texas. Grout and Epoxy Injection Grout injection is a popular strengthening technique, as it does not alter the aesthetic and architectural features of the existing buildings. The new strengthening technique consists of shear bolts externally installed in holes drilled through the slab thickness. Strengthening slab, which indicates a reduction in the ultimate and cracking strength UHPC after installing shear connectors engineering Support the structural members in the paper, the FRP installed. 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