Improvements in fracture behavior and shear capacity of fiber reinforced normal and self consolidating concrete: A comparative study

Gali, Sahith

doi:10.1016/j.conbuildmat.2018.08.194

Cited by 18 publications

(9 citation statements)

References 36 publications

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“…The rough surface of steel fibers provides higher shear strength at the matrix/fiber interface compared to the smooth surfaces of polypropylene fibers [ 44 ]. Additionally, the use of steel fibers has proven its efficiency in enhancing the shear capacity and ductility of reinforced concrete by increasing the residual strength of concrete at the postcracking stage; fibers provide bridging stresses through the cracks so the stress is transferred across the cracked section [ 45 , 46 ].…”

Section: Resultsmentioning

confidence: 99%

Influence of Polypropylene and Steel Fibers on the Performance and Crack Repair of Self-Compacting Concrete

et al. 2021

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The research reported in this paper aims to evaluate the epoxy injection technique used to strengthen fiber-reinforced self-compacting concrete (FRSCC) with high strength. This method is carried out on ruptured concrete specimens to assess the efficiency of the epoxy resin adhesive injection retrofitting technique for strength and stiffness. Five FRSCC mixes were designed and placed using different types (steel and polypropylene) and contents (0%, 0.25%, and 0.45% by volume) of fibers. The fresh and mechanical properties in addition to the microstructure of produced mixes were evaluated to assess the impact of fibers on the behavior of FRSCC. Results showed that the workability of FRSCC is reduced by increasing steel or polypropylene fiber content; however, the rheological characteristics of placed mixes satisfied the European Guidelines for Self-Compacting Concrete recommendation for fresh concrete. Also, splitting tensile, flexural, and shear strengths were enhanced by increasing fiber content. The simultaneous application of epoxy injection in FRSCC for repairing damaged concrete beams was shown to be highly effective.

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Section: Resultsmentioning

confidence: 99%

Influence of Polypropylene and Steel Fibers on the Performance and Crack Repair of Self-Compacting Concrete

et al. 2021

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Section: Resultsmentioning

confidence: 99%

“…There was virtually less fracture which indicates good interfacial bonding between fiber and matrix that triggers positive results in transferring the load received from stress applied from matrix to fiber and leads to high impact and others mechanical strength. 29 At higher microfiber loading of 50% composites as shown in Figure 5(f), the fracture surface results in the presence of "turbulent flow" pattern on the fracture area. The entangled of nonuniform dispersion was observed in the PP composite with higher OPEFB fiber loading, known as agglomeration which results from poor matrix-fiber adhesion.…”

Section: Morphological Studiesmentioning

confidence: 95%

Oil palm microfiber-reinforced handsheet-molded thermoplastic green composites for sustainable packaging applications

Hermawan

Hazwan

Gopakumar

et al. 2019

Progress in Rubber, Plastics and Recycling Technology

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The forestry and agricultural market have been perceiving outstanding growth due to the advantages of green composites, such as cost effective in nature, environment friendly, excellent mechanical properties, and so on. Various researchers had studied the reinforcement efficiency of various natural fibers in the diverse polymer matrices. Herein, we reported the characterization of microfiber handsheet-molded thermoplastic green composites developed from the combination of oil palm empty fruit bunch (OPEFB)-based microfiber pulp as filler and polyester PP based as matrix. Refined alkaline extracted OPEFB pulp fiber was mixed at different layered composition of the composite of grafted polypropylene. The physical properties and mechanical properties were conducted according to the ASTM standard and showed substantial improvement of the handsheet-molded composite. The scanning electron microgram showed that, as the addition of OPEFB fiber loading increased, there was improved interfacial bonding except for 50% fiber loading which experience fiber pullout. The result also showed improved thermal stability compared with the neat composite. This study will be an effective platform to develop the packaging materials using polymer handsheet composite. [Formula: see text]

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“…Steel plates of 200 mm wide and 100 mm wide were used at the loading point and support. The non-study region of the deep beam is strengthened by providing the shear reinforcement of 0.5% [53][54][55][56][57] as shown in Figure 4. One side of the beam was reinforced with stirrups to ensure that the failure of the beam occurs in the study region so that detailed instrumentation including DIC could be focused on that region.…”

Section: Test Specimen Detailsmentioning

confidence: 99%

Experimental Study on Evaluation of Replacing Minimum Web Reinforcement with Discrete Fibers in RC Deep Beams

Sagi

Lakavath

Prakash

et al. 2021

Fibers

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This study investigates the possibility of replacing the minimum web reinforcement in deep beams with discrete fibers. Additionally, the equivalent dosage of fibers required to obtain similar performance of the deep beam with minimum web reinforcement is investigated. Deep beams made of plain concrete with no fibers, beams with minimum web reinforcement as per AASHTO LFRD recommendations (0.3% in both horizontal and vertical), and with a 0.5% volume fraction of steel, macro-synthetic and hybrid fibers are tested at a shear span to height ratio (a/h) of one. Test results show that the presence of 0.3% web reinforcement in horizontal and vertical directions increased the peak load by 25% compared to the plain concrete beams. However, it did not significantly change the first diagonal crack load. With the addition of 0.5% of steel, macro-synthetic and hybrid fibers, the peak load increased by 49%, 42%, and 63%, respectively, compared to the plain concrete specimen. The addition of steel fibers significantly improved the first cracking load. In contrast, macro-synthetic fibers did not affect the first cracking load but improved the ductility with higher deflections at peak. Hybridization of steel and macro synthetic fibers showed improved performance compared to the individual fibers of the same volume in peak load and ductility. Test results showed that a 0.5% volume fraction of discrete macro steel or synthetic or hybrid fibers can be used to completely replace the minimum web reinforcement (0.3% in both directions).

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Improvements in fracture behavior and shear capacity of fiber reinforced normal and self consolidating concrete: A comparative study

Cited by 18 publications

References 36 publications

Influence of Polypropylene and Steel Fibers on the Performance and Crack Repair of Self-Compacting Concrete

Influence of Polypropylene and Steel Fibers on the Performance and Crack Repair of Self-Compacting Concrete

Oil palm microfiber-reinforced handsheet-molded thermoplastic green composites for sustainable packaging applications

Experimental Study on Evaluation of Replacing Minimum Web Reinforcement with Discrete Fibers in RC Deep Beams

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