Efficient near surface mounting CFRP strengthening of pretensioned hollowcore slabs with opening – An experimental study

Pachalla, Sameer Kumar Sarma; Prakash, Shamsher

doi:10.1016/j.compstruct.2016.11.072

Cited by 15 publications

(7 citation statements)

References 23 publications

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“…Results from numerous studies indicate that the flexural capacity of NSM FRPstrengthened specimens increases between 30-70% over unstrengthened specimens (De Lorenzis & Teng, 2007;Gopinath et al, 2016;Hosen et al, 2015;Pachalla & Prakash, 2017;Parvin & Shah, 2016;Rezazadeh et al, 2016;Sharaky et al, 2014Sharaky et al, , 2014Shukri et al, 2016;Siddika et al, 2019;Szabó & Balázs, 2007;. NSM FRP systems are usually applied at the soffit of RC beams and slabs (Figure 1(b)), which implies that such elements are wide enough to accommodate the necessary edge clearance and clear spacing between adjacent NSM grooves (Al-Mahmoud et al, 2009;Oehlers, 1992;Parretti & Nanni, 2004;Sena-Cruz et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation on low-strength RC beams strengthened with side or bottom near surface mounted FRP rods

Imjai

Setkit

Figueiredo

et al. 2022

Structure and Infrastructure Engineering

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Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation on low-strength RC beams strengthened with side or bottom near surface mounted FRP rods

Imjai

Setkit

Figueiredo

et al. 2022

Structure and Infrastructure Engineering

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“…The prestressing strands used do not possess a well-defined yield point. Hence, the value of yield strain is considered to be 9000 µm/m [5][6][7]. The initial strain measured during the pre-tensioning process was found to be 4200 µm/m.…”

Section: Load-strain Behaviormentioning

confidence: 99%

“…Various fibre reinforced polymer (FRP) strengthening techniques like near-surface mounting (NSM), and external bonding (EB) have been widely adopted for improving the flexure and shear performance of reinforced concrete (RC) members [1][2][3][4][5][6][7][8]. The drawbacks of the EB techniques due to debonding can be avoided or reduced with the NSM technique.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Effectiveness of Inorganic Bonding Materials for Near-Surface Mounting Shear Strengthening of Prestressed Concrete Beams

Kuntal

Chellapandian

Prakash

et al. 2020

Fibers

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Use of organic resins such as epoxy and vinyl esters as bonding materials in fibre reinforced polymer (FRP) strengthening of concrete members is widely accepted. However, the performance of organic resins is compromised when exposed to high temperature and extreme weather conditions leading to reduced durability of the strengthened systems. The present study attempts to evaluate the effectiveness of inorganic (cement mortar and geopolymer mortar) bonding materials for shear strengthening of prestressed concrete (PSC) beams using the near-surface mounting (NSM) technique. Different types of bonding materials are used in this study for NSM shear strengthening including: (i) epoxy resin, (ii) high strength cement grout (HSCG) and (iii) geopolymer mortar. Bond tests were first conducted to evaluate the pull-out/bond strength of different bonding materials. Bond tests revealed that epoxy resin had the highest bond strength followed by geopolymer mortar and HSCG. Sixteen full-scale PSC beams were cast with and without stirrups. The beams were strengthened using NSM CFRP laminates oriented at 45-degree configuration and then tested under a three-point bending configuration. Experimental results revealed that the performance of high strength cement grout and geopolymer mortar was similar but with a lesser efficiency compared to the epoxy resin.

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“…Several studies have been conducted on one-way and two-way strengthened and repaired slabs using different repair and strengthening techniques (Al-Kubaisy and Zamin, 2000; Anil et al, 2013; Dalfré and Barros, 2010; Hago et al, 2005; Pachalla and Prakash, 2017). Ebead and Marzouk (2004) examined the use of FRP laminates (carbon-fiber-reinforced polymer (CFRP) and glass-fiber-reinforced polymer (GFRP)) for strengthening two-way reinforced concrete (RC) slabs.…”

Section: Introductionmentioning

confidence: 99%

Strengthening and repair of one-way and two-way self-compacted concrete slabs using near-surface-mounted carbon-fiber-reinforced polymers

Ashteyat

Rjoub

Obaidat

et al. 2019

Advances in Structural Engineering

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The effectiveness of near-surface-mounted carbon-fiber-reinforced polymers on strengthening and repair of self-compacted concrete slabs was investigated experimentally and numerically. Twenty slabs were cast (10 one-way and 10 two-way) and tested under four-point load. Strengthening and repair effectiveness was investigated on slabs using near-surface-mounted carbon-fiber-reinforced polymer strips with straight and inclined orientation. Repair was performed on eight slabs using near-surface-mounted carbon-fiber-reinforced polymer strips with an orientation based on the best cost/capacity ratio, with two preloading levels: 35% and 50% of the ultimate load of the control slab. The results showed that using near-surface-mounted carbon-fiber-reinforced polymers increases the ultimate strength of one-way strengthened self-compacted concrete slabs (45%–163%) for both strip orientation, with the straight orientation performing better. Also, the cracking load and stiffness increased, while deflection decreased. The increase in ultimate strength for strengthened two-way slabs was 15% to 17%. The ultimate deflection and toughness of the two-way strengthened slabs increased 43% and 34%, respectively. Using near-surface-mounted carbon-fiber-reinforced polymers restored the load capacity of repaired one-way and two-way slabs but was more effective for one-way slabs. The repaired one-way slabs regained up to 223% of the control slabs’ ultimate strength, with a significant increase in stiffness (296%). The repaired two-way slabs regained up to 116% of the control slabs’ ultimate strength. The strength was higher in the case of the 50% preload compared to 35% preload. The finite element model shows somehow a reasonable capability of predicting the experimental behavior with a gap in terms of the stiffness and the maximum load.

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Efficient near surface mounting CFRP strengthening of pretensioned hollowcore slabs with opening – An experimental study

Cited by 15 publications

References 23 publications

Experimental and numerical investigation on low-strength RC beams strengthened with side or bottom near surface mounted FRP rods

Experimental and numerical investigation on low-strength RC beams strengthened with side or bottom near surface mounted FRP rods

Experimental Study on the Effectiveness of Inorganic Bonding Materials for Near-Surface Mounting Shear Strengthening of Prestressed Concrete Beams

Strengthening and repair of one-way and two-way self-compacted concrete slabs using near-surface-mounted carbon-fiber-reinforced polymers

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