scholarly journals Bending Performance of Concrete Beams Strengthened with Textile Reinforced Mortar TRM

2014 ◽  
Vol 601 ◽  
pp. 203-206 ◽  
Author(s):  
Lluís Gil ◽  
Christian Escrig ◽  
Ernest Bernat-Maso
Keyword(s):  
Composite Material ◽  
Carbon Fibers ◽  
Concrete Beams ◽  
Precast Concrete ◽  
High Strength ◽  
Point Load ◽  
Load Test ◽  
Bending Performance ◽  
Bending Loads ◽  
Textile Reinforced Mortar

This work presents a method of strengthening concrete structures based on textiles of high strength and mortars. The combination of textiles and mortars produces a new composite material with cementitious matrix. This material can be used for the reinforcement of concrete beams under bending loads. We tested several combinations of fibers: glass, Poliparafenil Benzobisoxazol (PBO), steel and carbon fibers with mortar and we used them to reinforce precast concrete beams. All the specimens were tested with a four-point load test. We discuss the performance of the specimens and we compare the ultimate results with the formulae from FRP codes.

Promising hybrid fabrics based on carbon and aramid fibers as a reinforcing filler for polymer composites

2019 ◽  
pp. 86-95 ◽  
Author(s):  
G. F. Zhelezina ◽  
V. G. Bova ◽  
S. I. Voinov ◽  
A. Ch. Kan
Keyword(s):  
Composite Material ◽  
Polymer Composites ◽  
Carbon Fibers ◽  
Mechanical Characteristics ◽  
High Strength ◽  
High Modulus ◽  
Hybrid Composite Material ◽  
Hybrid Fabric ◽  
Reinforcing Filler ◽  
Physical And Mechanical Characteristics

The paper considers possibilities of using a hybrid fabric made of high-modulus carbon yarn brand ZhGV and high-strength aramid yarns brand Rusar-NT for polymer composites reinforcement. The results of studies of the physical and mechanical characteristics of hybrid composite material and values of the implementation of the strength and elasticity carbon fibers and aramid module for composite material are presented. 

IN-SITU MEASUREMENT OF PERMEABILITY BETWEEN CARBON FIBER/RESIN

2021 ◽  
Author(s):  
MASAKI ENDO ◽  
HIROSHI SAITO ◽  
ISAO KIMPARA
Keyword(s):  
Composite Material ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Capital Investment ◽  
High Strength ◽  
Carbon Fiber Reinforced Plastic ◽  
Manufacturing Costs ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic

Carbon fiber reinforced plastic (CFRP) is a composite material in which carbon fibers are impregnated with resin to achieve both high strength and high rigidity. CFRP is an excellent material, but it is expensive in terms of materials, manufacturing costs, and capital investment, and it takes a lot of time to complete a product. In order to solve these problems, the demand for de-autoclaving has been increasing in recent years. If molding can be performed without autoclaving, it will be possible to reduce costs and improve productivity in terms of materials and capital investment costs.

scholarly journals Bending Performance and Reinforcement of Rocker Panel Components with Unidirectional Carbon Fiber Composite

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3164 ◽  
Author(s):  
Huili Yu ◽  
Hui Zhao ◽  
Fangyuan Shi
Keyword(s):  
Composite Material ◽  
Carbon Fiber ◽  
Fiber Composite ◽  
Fiber Material ◽  
High Strength ◽  
Carbon Fiber Composite ◽  
Bending Performance ◽  
Fiber Composite Material ◽  
Crash Safety ◽  
Carbon Fiber Material

Unidirectional carbon fiber composite material is one of the most common types of composites employed in vehicles, and its bending performance plays an important role in crash safety, especially in side pole impact. This study aimed to redesign one of the most important components of the side structure of a vehicle, the rocker panel, with unidirectional carbon fiber composite material. Our results show that it is not easy to acquire the same bending performance as that of a steel rocker panel by merely replacing it with carbon fiber material and increasing the wall thickness. Therefore, reinforcements were employed to improve the bending performance of the carbon fiber rocker panel, and a polypropylene reinforcement method achieved a weight reduction of 40.7% compared with high-strength steel.

scholarly journals Behaviour of Reinforced Concrete Beams With Circular Transverse Openings Under Static Loads

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Ling Jen Hua ◽  
Howe Sheng Tang ◽  
Wen Kam Leong ◽  
How Teck Sia
Keyword(s):  
Reinforced Concrete ◽  
Failure Modes ◽  
Concrete Beams ◽  
Reinforced Concrete Beam ◽  
Equation Model ◽  
Point Load ◽  
Load Test ◽  
Reinforced Concrete Beams ◽  
Structural Behaviour ◽  
Beam Height

Transverse opening in a reinforced concrete beam allows the crossing of mechanical and electrical services through the beam. However, it affects the strength of a beam. Understanding its structural behaviour is crucial to ensure a safe design of the beam. For that, an experimental study was carried out on reinforced concrete beams with circular transverse openings. The four-point load test was conducted to study the effects of the size and the position of the opening on the beam performance under the shear and flexural loads. In addition, three reinforcing methods for the opening were tested. The beams were evaluated in terms of the load-displacement responses, mechanical properties, deflections, and failure modes. The opening with the diameter not exceeding 0.25 times beam height affected about 20% of beam strength (without reinforcements at the opening). The diagonal bar reinforcing method effectively restored the beam strength for the opening size not exceeding 1/3 of beam height. The equation model proposed conservatively predicted the ultimate capacity of the beam with a transverse opening.

scholarly journals USING CARBON FIBER STRIPS IN JOINTS STRENGTHING OF BOX SEGMENTAL SELF-COMPACTING CONCRETE BEAMS

2020 ◽  
Vol 24 (06) ◽  
pp. 22-32
Author(s):  
Ahmed H. Hashim ◽  
◽  
Waleed A. Wrayosh ◽  
Keyword(s):  
Carbon Fibers ◽  
Concrete Beams ◽  
Precast Concrete ◽  
Reference Beam ◽  
Concrete Surface ◽  
Self Compacting Concrete ◽  
Cfrp Sheets ◽  
Mode Of Failure ◽  
Cracking Mode ◽  
Self Compact Concrete

The main objective of this research is to study the effect of carbon fibers used to strengthen the joints of the box segmental beams. For this research, four beams were produced and tested. One of these beams, monolithically, was cast as a reference beam and the three others were segmental beams. All beams were produced with Self-Compact Concrete (SCC) and box cross section. Each segmental beam consisted of three precast concrete segments were connected by post tensioning tendons. The three segmental beams have same characteristics, but different in joint types between the segments. The types of joints used were (dried , epoxied and dried strengthen by CFRP sheets). All beams were tested under static two point loads up to failure. For each test, deflections at mid-span location were recorded for each (5kN). Also, first cracking, mode of failure and ultimate loads values were recorded as well as the concrete surface strains at the specified locations for both loadings.

scholarly journals Bond Coefficient kb of Concrete Beams Reinforced with GFRP, CFRP, and Steel Bars

2021 ◽  
Vol 7 (7) ◽  
pp. 1235-1243
Author(s):  
Naser Kabashi ◽  
Arbër Këpuska ◽  
Enes Krasniqi ◽  
Besart Avdyli
Keyword(s):  
Glass Fiber ◽  
Limit State ◽  
High Strength ◽  
Point Load ◽  
Load Test ◽  
Fiber Reinforced Polymer ◽  
Geometrical Parameters ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Different Diameters

There are several reasons why civil and structural engineers should use Fiber Reinforced Polymer bars in concrete. The primary reason is durability, and other relevant parameters, high strength and, lightweight. Non-corrosive attributes make their use particularly suitable in different situations. Due to low elastic modulus and poor bonding, the use of Fiber Reinforced Polymer results in larger crack widths under serviceability limit state especially beams reinforced with glass fiber bars. The study purpose of this paper is to investigate the kb values. The methodology of this paper is comparing the analytical and experimental results. The investigation included 12 beams, using the four-point load test. The geometrical parameters of tested beams with dimensions: 130×220×2200 mm, reinforced with different diameters, helically-grooved glass fiber bars, and sand-coated carbon fiber bars. The measured cracks were used to assess the current kb values recommended in the design codes and guides. The findings did not support the use of the same kb value for different bars because, in addition to the type of bar, the value of kb is also affected by the type of surface and the diameter of the bar. What is observed based on results shows that CFRP bars have a more constant value depending on the diameter, while GFRP bars have large value changes depending on the diameter. Doi: 10.28991/cej-2021-03091722 Full Text: PDF

scholarly journals Influence of the Modulus of Elasticity of CFRPs on the Compressive Behavior of Confined Test Pieces and on the Flexural Behavior of Short Concrete Beams

2021 ◽  
Vol 11 (2) ◽  
pp. 491
Author(s):  
Daniela Brizuela Valenzuela ◽  
María de las Nieves González García ◽  
Alfonso Cobo Escamilla
Keyword(s):  
Flexural Strength ◽  
Carbon Fibers ◽  
Mechanical Response ◽  
Concrete Beams ◽  
High Strength ◽  
Flexural Behavior ◽  
Strength Testing ◽  
Confined Compression ◽  
Reinforced Polymers ◽  
Test Pieces

In this study, we compare the behavior of confined compression-tested concrete test pieces and short concrete beams subjected to three-point flexural strength testing when they are reinforced with high-modulus, high-strength carbon fibers reinforced polymers (CFRP). The fabrics used have roughly the same mechanical capacity but very different rigidities. As such, the results make it possible to obtain the influence of the rigidity of the CFRP on the structural behavior of the elements tested. The results obtained show that the type of fabric used does not cause significant differences in the values of tension of rupture and the form of rupture of the test pieces subjected to compression and flexural strength testing, which suggests that the variable which determines the mechanical response of the elements which have been reinforced and subjected to these kinds of demands is the mechanical capacity of the reinforcement, not its rigidity.

scholarly journals Design and Testing of Various Ceiling Elements Made of Carbon Reinforced Concrete

Proceedings ◽  
2018 ◽  
Vol 2 (8) ◽  
pp. 543 ◽  
Author(s):  
Alexander Schumann ◽  
Sebastian May ◽  
Manfred Curbach
Keyword(s):  
Composite Material ◽  
Reinforced Concrete ◽  
Large Scale ◽  
Precast Concrete ◽  
High Strength ◽  
Research Project ◽  
Steel Reinforced Concrete ◽  
New Type ◽  
Improved Design ◽  
Design And Testing

In this paper the design and recalculation of new type ceiling elements made of carbon reinforced concrete (CRC) is described. With the use of the high-potential composite material carbon reinforced concrete, structures can be, compared to conventional steel reinforced concrete (RC), designed and manufactured slimmer and lighter. Because of this and the increased sustainability of ceiling elements made of CRC a noteworthy amount of concrete can be saved. To show the potential of CRC elements, four different structures for various fields of application are shown. The first ceiling element, which will be introduced, fits perfectly for the use in multi-storey car parks because of the high resistance of the carbon fibers against corrosion. Another CRC structure in this paper was created in a research project as a demonstrator to show the potential of the newly developed concrete mixture for CRC. To prove the ability of this new developed concrete, large-scale CRC I-beams were produced in a precast concrete factory. The third ceiling element was designed and manufactured in form of a shell to combine the high strength composite material with an improved design for ceiling elements. The last introduced CRC element was developed as demonstrator in another research project and was designed in form of a ribbed slab.

Load Test on Reinforced Concrete Beams Strengthened by Carbon Fiber Laminated Plates - A Case Study

2011 ◽  
Vol 87 ◽  
pp. 255-258
Author(s):  
Humayun R. H. Kabir ◽  
Abdul Lateef Al-Khaleefi
Keyword(s):  
Reinforced Concrete ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Concrete Beams ◽  
Laminated Plates ◽  
Management Team ◽  
Load Test ◽  
Reinforced Concrete Beams ◽  
Interesting Observation

A load test was performed on reinforced concrete beams that were strengthened with carbon fibers. Seventy five thousands blocks were placed in four stages. A quality and management team worked continuously in the testing process. No creep effects were noticed with the use of carbon fiber plates, an interesting observation.

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