Experimental Study on Interfacial Bonded Performance of One-Step Forming BFRP-Rod-Strengthened Bamboo

2014 ◽  
Vol 501-504 ◽  
pp. 1014-1020 ◽  
Author(s):  
Bai Chuan Ding ◽  
Qing Fang Lv ◽  
Ran Zhu
Keyword(s):  
Experimental Study ◽  
Failure Modes ◽  
Basalt Fiber ◽  
Interfacial Bonding ◽  
Pull Out ◽  
Bonding Failure ◽  
Bonding Properties ◽  
One Step ◽  
The One ◽  
Strengthening Method

This work attempts a new strengthening method (one-step forming) between BFRP (basalt fiber reinforcement polymer) rod and bamboo. The interfacial bonding properties of the one-step forming pull-out specimens are achieved. The specimens are composed of bamboo sticks lamination and recombined bamboo respectively containing the plutruded BFRP rods. Through the experiment, bonding failure modes and typical load-slip curves are obtained. Besides, the ultimate bonding stress is compared to bonded-in method of FRP rod which embedded in wood. At last, anchoring calculation recommendations are delivered.

Experiment on the Bonding Performance of BFRP Bars Reinforced Concrete

2012 ◽  
Vol 174-177 ◽  
pp. 993-998 ◽  
Author(s):  
Shi Yong Jiang ◽  
Yong Ye ◽  
Wei Fei
Keyword(s):  
Reinforced Concrete ◽  
Failure Modes ◽  
Concrete Strength ◽  
Basalt Fiber ◽  
Test Methods ◽  
Load Level ◽  
Reinforced Plastics ◽  
Bonding Performance ◽  
Pull Out ◽  
Bonding Properties

Through the pull-out test methods, the concrete strength、reinforcement diameter Basalt Fiber Reinforced Plastics Bars、the anchorage length、 stirrup rate and other factors on the bonding properties of the BFRP reinforced concrete is analyzed. The BFRP bars and reinforcing steel bars bonding properties is compared. BFRP reinforced concrete bond failure mode has two types .As the concrete strength increases, the bond strength of the BFRP reinforced concrete increased. With the increase BFRP bars diameter and shear lag relationship, the cohesive force of the BFRP reinforced concrete decrease accordingly. And the failure modes of the shape of the BFRP reinforcement concrete in BFRP bonding properties with a big impact for the specimens’ configuration stirrups on the ductility. When BFRP bars loading under the same load level, the end of the slip is greater than the free end slip.

scholarly journals Experimental Research on AFRP Reinforced Recycled Steel Tube Columns Subjected to Axial Compression

2017 ◽  
Vol 26 (6) ◽  
pp. 096369351702600
Author(s):  
Min Hou ◽  
Jiangfeng Dong ◽  
Lang Li ◽  
Shucheng Yuan ◽  
Qingyuan Wang
Keyword(s):  
Carrying Capacity ◽  
Failure Modes ◽  
Basalt Fiber ◽  
Steel Tube ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Load Carrying Capacity ◽  
Load Carrying ◽  
The One ◽  
Effective Use

In order to make an effective use of the recycled aggregate concrete (RAC), a total of six steel tube RAC columns and six basalt fiber (BF) reinforced RAC columns, including six columns that were externally strengthened with aramid fiber reinforced polymer (AFRP) sheets, were fabricated and tested. This were to provide a strengthening solution to upgrade the load carrying capacity, ductility and rigidity of the RAC filled steel tube columns. Besides, the recycled coarse aggregate (RCA) replacement ratios for production of RAC was analyzed. The results show that the load carrying capacity and ultimate displacements of the RAC filled ST columns could be improved greatly by adding of basalt fiber, especially for the specimens with 50% and 100% RCA replacement ratio. The similar result was also found for the specimens strengthened with AFRP reinforcement, along with the stiffness of the columns were enhanced obviously. Moreover, the highest improving on the load carrying capacity, stiffness and ultimate displacement was found in the specimens both reinforced by adding of BF and strengthening of AFRP. However, the failure modes of the specimens with BF reinforced RAC gave a higher deformability than the one with AFRP strengthening arrangement.

Experimental Study on Seismic Behavior of Strengthening Joints in Light Steel Adding Storey

2013 ◽  
Vol 671-674 ◽  
pp. 1480-1483
Author(s):  
Rong Guo ◽  
Shao Wei Zhao ◽  
Kun Liu
Keyword(s):  
Experimental Study ◽  
Energy Consumption ◽  
Seismic Behavior ◽  
Failure Modes ◽  
Stiffness Degradation ◽  
Test Results ◽  
Static Tests ◽  
Concrete Frame ◽  
Different Types ◽  
Strengthening Method

In order to acquire the seismic performance of three different types of nodes between the concrete frame and the light steel adding storey, the pseudo-static tests were carried out to analyse contrastively these specimens’ failure modes, stiffness degradation, hysteretic curves and energy dissipation. The test results showed that : Three nodes’ destruction were due to the plastic hinges emerging at the end of beam; both encased steel and carbon fiber strengthening method can improve the seismic behavior, and in terms of the ultimate bearing capacity, energy consumption ability，the encased steel strengthening one can improved more significantly, and the encased steel one can effectively slow down the speed of stiffness degradation.

Analysis of influence factors on interfacial bond between BFRP bars and seawater sea-sand concrete

2020 ◽  
pp. 073168442094160
Author(s):  
Yuntao Hua ◽  
Shiping Yin ◽  
Zihan Wang
Keyword(s):  
Bond Strength ◽  
Bond Length ◽  
Failure Modes ◽  
Influence Factors ◽  
Basalt Fiber ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Bond Slip ◽  
Pull Out ◽  
Reinforced Polymer

In this paper, the influences of parameters such as the bond length, surface textures of reinforcement, reinforcement type and stirrups restraint were considered. Pull-out failure, splitting failure and splitting-pullout failure modes were observed during the test. The slip at the free end always lagged behind the slip at the loading end and the bond-slip curve of ribbed basalt fiber reinforced polymer (BFRP) bars included the micro-slip stage, slip stage, descent stage, and residual stage. Reducing the bond length and using ribbed-sand coated bars were beneficial to improve the bond performance. Increasing the bond length from 2.5 d to 5 d reduced the bond strength by 49.2%. The application of ribbed-sand coated bars instead of plain bars increased the bond strength by 1202.3%. The difference in bond strength between steel bars, BFRP bars and glass fiber reinforced polymer (GFRP) bars was small and the bond strengths of the three were much greater than that of carbon fiber reinforced polymer (CFRP) bars. This was mainly attributed to the different rib forms of the bars. The application of stirrups increased the bond strength by 11.5%, which indicated that the stirrup restraints can improve the bond behavior to a certain extent. Besides, the analysis of the bond-slip curve based on the energy perspective was consistent with test results.

scholarly journals Enhancing the Interfacial Adhesion with Rubber Matrix by Grafting Polydopamine-Carbon Nanotubes onto Poly(p-phenylene terephthalamide) Fibers

Polymers ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1231 ◽  
Author(s):  
Xuan Yang ◽  
Qunzhang Tu ◽  
Xinmin Shen ◽  
Qin Yin ◽  
Ming Pan ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Interfacial Adhesion ◽  
Testing Machine ◽  
Rubber Matrix ◽  
Step Method ◽  
Single Filament ◽  
Chemical Structures ◽  
Pull Out ◽  
One Step ◽  
The One

To enhance the interfacial adhesion between poly(p-phenylene terephthalamide) (PPTA) fibers and a rubber matrix without damaging the fiber structures, aminated carbon nanotubes (NH2-CNTs) were mildly deposited onto the fiber surface by combining the biomimetic modification of dopamine via the Michael addition reaction. Furthermore, differences between the “one-step” method and the “two-step” method were researched through adjusting the addition sequence of NH2-CNTs. The surface morphologies and chemical structures of PPTA fibers before and after modification were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The mechanical properties of fibers and the adhesive properties with rubber were tested using an electronic tensile tester of single-filament and universal testing machine, respectively. After modification by the “one-step” method for 24 h, the single-filament tensile strength of the modified fibers increased by 16.5%, meanwhile, the pull-out force of the modified fibers to rubber increased by approximately 59.7%. Compared with the “two-step” method, the “one-step” method had superiority due to the short reaction time and the large deposition rate of CNTs.

scholarly journals Experimental study on the behaviour of nonductile infilled RC frames strengthened with external mesh reinforcement and plaster composite

2010 ◽  
Vol 10 (11) ◽  
pp. 2305-2316 ◽  
Author(s):  
S. Z. Korkmaz ◽  
M. Kamanli ◽  
H. H. Korkmaz ◽  
M. S. Donduren ◽  
M. T. Cogurcu
Keyword(s):  
Experimental Study ◽  
Failure Modes ◽  
Mesh Reinforcement ◽  
Rc Frames ◽  
Concrete Quality ◽  
Reference Specimens ◽  
Infilled Rc Frames ◽  
Reversed Cyclic ◽  
External Mesh ◽  
Strengthening Method

Abstract. The aim of this paper is to report on an experimental study about Turkish Earthquake Code on suggested strengthening method. The proposed method uses existing brick infill walls and the strengthening is done with the application of external mesh reinforcement and plaster. 5 nonductile 1/2 scaled, one bay, two storey RC specimens were tested under a reversed cyclic loading. The first two specimens were reference specimens and the other ones were strengthened with the proposed method. The specimens contained several design and construction mistakes such as low concrete quality and improper steel detailing. Strength, stiffness and storey drifts of the test specimens were measured. The results of the test on these frames were compared with the reference specimens. The effects of the reinforced mesh plaster application for strengthening on behaviour, strength, stiffness, failure mode and ductility of the specimens were investigated. Unexpected failure modes were observed during the testing and the results were summarized in this paper.

scholarly journals Experimental Study on Flexural Capacity of Corroded RC Slabs Reinforced with Basalt Fiber Textile

2020 ◽  
Vol 11 (1) ◽  
pp. 144
Author(s):  
Liang Fang ◽  
Yun Zhou ◽  
Duhang Yi ◽  
Weijian Yi
Keyword(s):  
Experimental Study ◽  
Mass Loss ◽  
Failure Modes ◽  
Basalt Fiber ◽  
Fiber Reinforced Polymers ◽  
Flexural Capacity ◽  
Accelerated Corrosion ◽  
Externally Bonded ◽  
Reference Specimens ◽  
Rc Slabs

This experimental study investigated the flexural performance of corroded reinforced concrete (RC) slabs strengthened with basalt textile-reinforced mortar (BTRM) and basalt fiber-reinforced polymers (BFRP). Ten RC slabs were designed to achieve the expected corrosion levels (8% mass loss for moderate corrosion and 16% mass loss for severe corrosion) by accelerated corrosion methods. Two slabs served as reference specimens, and eight slabs were strengthened with BFRP or BTRM. The specimens were loaded to failure by the four-point bending method. The corrosion ratio, strengthening materials and the number of layers were tested for comparison. The failure modes, flexural capacities, load–deflection curves and deformation performances of the slabs were obtained from experiments. It was found that the use of BTRM layers was more effective in improving the flexural response than the use of the same amount of BFRP layers externally bonded with the corroded RC slabs under a state of serviceability. The results also showed that the strengthening effects of BFRP and BTRM were affected by the initial corrosion ratio and the number of textile layers. In a moderate state of corrosion, the flexural capacities and deflection capacities of RC slabs strengthened by BFRP and BTRM were increased substantially; the flexural capacities were increased by 27.81%~61.85%. In a severe corrosion state, the increase in flexural capacity of strengthened slabs is marginal but the increase in ductility indexes was 18% to 35% compared with the corresponding control slabs. By increasing the number of textile layers from three to five, the increments of the flexural capacity of strengthened slabs are almost doubled. Finally, the calculated results of the flexural capacity of the corroded RC slabs strengthened with BFRP and BTRM were found to be in good agreement with the experimental results.

Study on the interfacial bonding behaviour of corroded steel bars and TRC constrained concrete

2019 ◽  
Vol 66 (5) ◽  
pp. 661-670
Author(s):  
Chang-Shun Hu ◽  
Shiping Yin ◽  
Meng-Ti Yin
Keyword(s):  
Bond Strength ◽  
Interfacial Bonding ◽  
Detectable Effect ◽  
Textile Reinforced Concrete ◽  
Content Type ◽  
Bonding Performance ◽  
Pull Out ◽  
Steel Bars ◽  
Bonding Properties ◽  
Ultimate Bond Strength

Purpose This paper aims to evaluate the bonding properties of textile reinforced concrete (TRC)-confined concrete and corroded plain round bars. Design/methodology/approach The bonding performance of three types of specimens (not reinforced, reinforced after corrosion and reinforced before corrosion) was studied by a central pull out test. Findings The ultimate bond strength between the corroded steel bars and the concrete is improved when the corrosion ratio is small. After cracking, the degree of corrosion continues to grow and the ultimate bond strength decreases. TRC reinforcement has no detectable effect on the interfacial bonding properties between concrete and plain round bars when the corrosion of steel bars is small; however, when the concrete cracks under the action of rust corrosion, the TRC constraints can effectively improve the bonding performance of the two components. Practical implications TRC layer significantly delayed the chloride penetration rate, which can effectively limit the development of corrosion cracking.

scholarly journals Pull-Out Resistance Capacity of a New Perfobond Shear Connector for Steel Pile Cap Strengthening

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
Young-Ho Kim ◽  
Jae-Yoon Kang ◽  
Hyun-Bon Koo ◽  
Dae-Jin Kim
Keyword(s):  
Failure Modes ◽  
Shear Connector ◽  
Test Results ◽  
Pull Out ◽  
Dowel Action ◽  
Test Parameters ◽  
Pile Cap ◽  
New Type ◽  
Embedment Length ◽  
The One

This study proposes a new type of the perfobond shear connector, which can be used to strengthen the steel pile cap embedded into the structure foundation, and evaluates its pull-out resistance capacity by performing a test on ten specimens. Test parameters include the embedment length of the shear connector, existence of transverse rebars passing through holes in the shear connector, and their shape, size, and number. The pull-out load versus slip curve is plotted for all specimens, and their failure modes are identified. The effects of the test parameters on the peak pull-out load are examined in this work. The test results show that the perfobond shear connector proposed in this study can retain the peak pull-out load up to 6 times higher than the one without any holes. This indicates that the existence of holes in the shear connector enables the dowel action of concrete inside the hole, resulting in the improvement of the shear resistance capacity of the connector.

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