Effect of using carbon nanotube modified epoxy on bond–slip behavior between concrete and FRP sheets

Irshidat, Mohammad R.; Al‐Saleh, Mohammed H.

doi:10.1016/j.conbuildmat.2015.12.183

Cited by 71 publications

(27 citation statements)

References 50 publications

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“…Most of the existing researches about adhesive bonding technology and composites materials are for aeronautical and space science and other industries [16][17][18][19] , and lack researches has been regarded to use those polymers and composites material in civil engineering [20][21][22][23][24] . Nowadays does not exist any mandatory structural design code around the world.…”

Section: Introductionmentioning

confidence: 99%

Carbon Fiber Reinforced Polymer and Epoxy Adhesive Tensile Test Failure Analysis Using Scanning Electron Microscopy

2017

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Morphological characteristics analysis before and after tensile tests were studied using scanning electron microscopy (SEM) technique to follow the failure evolution on carbon fiber reinforced polymer (CFRP) and epoxy resins. Micrograph analysis of CFRP plate before tensile test shows some intrinsic manufacturing defects, which can influence the mechanical properties of the material. Micrograph analysis after tensile test shows that cracks propagation start in manufacturing defects, which lead the carbon fiber to be pulled out instead of breaking. Thus, cracks propagate through interfacial zones affecting the sharing force between matrix and carbon fiber. For the epoxies materials, the microscopy analysis showed that although epoxies adhesive have different phase distribution before tensile test, failure surfaces are described by fine granular particles covalent bonded with matrix, and the material fails in a brittle manner when the strength outstripped these bonds. Failure process for each material correlating the mechanical properties with the morphological characteristics of materials was discussed.

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Section: Introductionmentioning

confidence: 99%

Carbon Fiber Reinforced Polymer and Epoxy Adhesive Tensile Test Failure Analysis Using Scanning Electron Microscopy

2017

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“…The experimental database is collected from the tests that were conducted to measure the bond strength between CFRP sheets and the concrete surface under direct tension. Table A.1 in the Appendix summarizes a sample of the experimental training database from the collected specimens (Woo & Lee, 2010;Ming & Ansari, 2004;Mazzotti, Ferracuti, & Bilotta, 2012;Al-Allaf, Weekes, Augusthus-Nelson, & Leach, 2016;Ali-Ahmad, Subramaniam, & Ghosn, 2006;Al-Rousan et al, 2015;Biolzi, Ghittoni, Fedele, & Rosati, 2013;Czaderski et al, 2010;Wan, Jiang, & Wu, 2018;Ghorbani, Mostofinejad, & Hosseini, 2017;Haddad et al, 2013;Haddad, Al-Rousan, Ghanma, & Nimri, 2015;Haddad & Al Dalou, 2018;Hadigheh, Gravina, & Setunge, 2015;Hosseini & Mostofinejad, 2013Irshidat & Al-Saleh, 2016;Ko, Matthys, Palmieri, & Sato, 2014;Mostofinejad, M. H. Mofrad, Hosseini, & H. H. Mofrad, 2018;Nigro, Di Ludovico, & Bilotta, 2011;Pan & Leung, 2007;Serbescu, Guadagnini, & Pilakoutas, 2013;Sharma, Mohamed Ali, Goldar, & Sikdar, 2006;Toutanji & Ortiz, 2001;Toutanji, Saxena, Zhao, & Ooi, 2007;Wu & Jiang, 2013;Yao, Teng, & Chen, 2005). The training and testing or validation data are randomly selected from these data where 63% of the data set is used for training while 37% is used for testing and validation.…”

Section: Experimental Databasementioning

confidence: 99%

“…Haddad, Al-Rousan, and Almasry (2013) have found that high temperature (more than 400 °C) has an adverse effect on bond strength between fiber and concrete where bond strength is reduced to 64%. Irshidat and Al-Saleh (2016) have found that the bond behaviour between concrete and fiber is influenced by bond length and width. Pan and Leung (2007) have found that concrete compressive or splitting tensile strength has a minor effect on the bond behaviour between FRP and concrete.…”

Section: Introductionmentioning

confidence: 99%

Predictive Model to the Bond Strength of FRP-to-Concrete Under Direct Pullout Using Gene Expression Programming

Murad

Ashteyat

Hunaifat

2019

Journal of Civil Engineering and Management

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Gene expression programming (GEP) is used in this research to develop an empirical model that predicts the bond strength between the concrete surface and carbon fiber reinforced polymer (CFRP) sheets under direct pull out. Therefore, a large and reliable database containing 770 test specimens is collected from the literature. The gene expression programming model is developed using eight parameters that predominantly control the bond strength. These parameters are concrete compressive strength, maximum aggregate size, fiber reinforced polymer (FRP) tensile strength, FRP thickness, FRP modulus of elasticity, adhesive tensile strength, FRP length, and FRP width. The model is validated using the experimental results and a statistical assessment is implemented to evaluate the performance of the proposed GEP model. Furthermore, the predicted bond results, obtained using the GEP model, are compared to the results obtained from several analytical models available in the literature and a parametric study is conducted to further ensure the consistency of the model by checking the trends between the input parameters and the predicted bond strength. The proposed model can reasonably predict the bond strength that is most fitting to the experimental database compared to the analytical models and the trends of the GEP model are in agreement with the overall trends of the analytical models and experimental tests.

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“…In the past, the cement base was the main research object in the domain of intelligent materials and polymer base was rarely used as a reinforcement material [10,11]. By adding carbon nanofiber (CNF) to PUC reinforcement materials, a carbon nanocarbon fiber polyurethane cement material (CNFPUC) could be made and thus, the fluidity of the mixture could be improved, with the advantages of low density, high specific modulus, high specific strength, high conductivity, thermal stability, compact structure and so forth [12][13][14]. Not only is CNFPUC used as a structural reinforcement material, it also has the conductive properties necessary to satisfy engineering application requirements.…”

Section: Introductionmentioning

confidence: 99%

Dispersion and Pressure Sensitivity of Carbon Nanofiber-Reinforced Polyurethane Cement

2018

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The sensitivity of carbon nanofiber polyurethane cement (CNFPUC) was evaluated to determine whether the cement can act as an intelligent reinforcement material. The percolation thresholds at different polymer-to-cement ratios were determined through experimentation. Taking a specific carbon nanofiber (CNF) content of the percolation zone, several CNFPUC mixtures with different poly-ash ratios and silica fume contents were made. They were then sampled from the mixture and poured into a hexahedron CNFPUC test block; the coefficient of variation of resistance and the piezoresistive characteristics under axial load were examined and the blocks were examined by scanning electron microscope. The sensitivity of the CNFPUC mixture was evaluated via the resistance variation coefficient of a sample hexahedron. For different CNF dosages, the critical value of the variation coefficient was used to assess the sensitivity characteristic by fitting the conic curve. These findings may provide a novel and simple method for determining the sensitivity of CNFPUC mixtures.

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Effect of using carbon nanotube modified epoxy on bond–slip behavior between concrete and FRP sheets

Cited by 71 publications

References 50 publications

Carbon Fiber Reinforced Polymer and Epoxy Adhesive Tensile Test Failure Analysis Using Scanning Electron Microscopy

Carbon Fiber Reinforced Polymer and Epoxy Adhesive Tensile Test Failure Analysis Using Scanning Electron Microscopy

Predictive Model to the Bond Strength of FRP-to-Concrete Under Direct Pullout Using Gene Expression Programming

Dispersion and Pressure Sensitivity of Carbon Nanofiber-Reinforced Polyurethane Cement

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