scholarly journals Effect of Fiber-Matrix Bond Strength on the Crack Resistance of Synthetic Fiber Reinforced Cementitious Composites

1987 ◽  
Vol 114 ◽  
Author(s):  
Victor C. Li ◽  
Youjiang Wang ◽  
Stanley Backer
Keyword(s):  
Crack Resistance ◽  
Fiber Surface ◽  
Fiber Reinforced Concrete ◽  
Synthetic Fiber ◽  
Fiber Reinforced ◽  
Softening Behavior ◽  
Tension Softening ◽  
Cantilevered Beam ◽  
Fiber Matrix ◽  
Bond Characteristics

ABSTRACTFiber matrix bond characteristics can be changed by treatments of the fiber surface. The effect of such treatments on the fiber reinforced concrete (FRC) tension-softening behavior and crack resistance is studied in this paper. Various R-curve behaviors are predicted based on a simple double cantilevered beam (DCB) model using the experimentally derived tensionsoftening curves. The result suggests that fiber surface treatments can substantially alter the composite fracture resistance as measured by the R-curve.

A Possibility of Utilizing Extra-Strong Synthetic Fiber Reinforced Concrete with Local Materials in Vietnam

2021 ◽  
pp. 509-517
Author(s):  
Dinh Van Hiep ◽  
Nguyen Cong Thang ◽  
Nguyen Van Khanh ◽  
Masaya Aihara ◽  
Tadaaki Nozawa ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Fiber Reinforced Concrete ◽  
Synthetic Fiber ◽  
Fiber Reinforced ◽  
Local Materials

The influence of natural and synthetic fibers on mixed mode I/II fracture behavior of cement concrete materials

2019 ◽  
Vol 46 (12) ◽  
pp. 1081-1089 ◽  
Author(s):  
Hossein Karimzadeh ◽  
Ali Razmi ◽  
Reza Imaninasab ◽  
Afshin Esminejad
Keyword(s):  
Fracture Toughness ◽  
Reinforced Concrete ◽  
Mixed Mode ◽  
Fiber Reinforced Concrete ◽  
Bending Test ◽  
Synthetic Fiber ◽  
Mode I ◽  
Fiber Reinforced ◽  
Synthetic Fibers ◽  
Natural And Synthetic

This paper evaluated mixed mode I/II fracture toughness of fiber-reinforced concrete using cracked semi-circular bend (SCB) specimens subjected to three-point bending test. Additionally, a comparison was made between the experimental results and the estimations made by different theoretical criteria. Natural and synthetic fibers at various concentrations were used in this study. After producing cracks in SCB specimens at different inclination angles to induce different mixed mode loading conditions (from pure mode I to II), the fracture toughness of SCB specimens was determined. Furthermore, the compressive, splitting tensile, and flexural strength of natural and synthetic fiber-reinforced concrete were measured after 7 and 28 days of curing. While there is an increase in the aforementioned strengths with fiber content increase, 0.3% was found to be the optimum percentage regarding fracture toughness for both fibers. Also, the comparison between the experimental and theoretical results showed that generalized maximum tangential stress criterion estimated the experimental data satisfactorily.

Bond Characteristics between ECC (Engineered Cementitious Composites) and GFRP Rebars

2012 ◽  
Vol 602-604 ◽  
pp. 1010-1013
Author(s):  
Yun Cheol Choi
Keyword(s):  
Fiber Reinforced Concrete ◽  
Fiber Reinforced Polymers ◽  
Cementitious Composites ◽  
Fiber Reinforced ◽  
Engineered Cementitious Composites ◽  
Bond Slip ◽  
Glass Fiber Reinforced ◽  
Concrete Type ◽  
Gfrp Rebars ◽  
Bond Characteristics

The purpose of this study is to investigate the bond characteristics between ECC(Engineered Cementitious Composites) and GFRP(Glass Fiber Reinforced Polymers) rebars. An experimental study was carried out to investigate the bond-slip properties of the steel and GFRP rebars in ECC which was reinforced with Polyvinyl Alcohol(PVA) fibers. A total of 8 beam specimens, which was designed according to the RILEM guidelines, was tested according to the RILEM guideline. The main objective was evaluating the load versus displacement and load versus slip behavior and the bond strength regarding the influence of the following parameters : concrete type(Normal concrete and fiber reinforced concrete) and bar diameter and type. From the test results, concrete and ECC specimen presented similar behavior for steel reinforced specimen. However, GFRPO reinforced specimen show different behavior with that. Comparative study for test and equations of MC90 was carried out and code provision predicted the bond characteristics conservatively.

scholarly journals Microscale Cohesive-Friction-Based Finite Element Model for the Crack Opening Mechanism of Hooked-End Steel Fiber-Reinforced Concrete

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 669
Author(s):  
Yassir M. Abbas
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Steel Fiber ◽  
Crack Opening ◽  
Fiber Reinforced Concrete ◽  
Embedment Depth ◽  
Fe Model ◽  
Fiber Reinforced ◽  
Steel Fiber Reinforced Concrete ◽  
Fiber Matrix

The entire mechanical properties of steel fiber-reinforced concrete (SFRC) are significantly dependent on the fiber–matrix interactions. In the current study, a finite element (FE) model was developed to simulate the pullout response of hooked-end SFRC employing cohesive–frictional interactions. Plain stress elements were adapted in the model to exemplify the fiber process constituents, taking into consideration the material nonlinearity of the hooked-end fiber. Additionally, a surface-to-surface contact model was used to simulate the fiber’s behavior in the pullout mechanism. The model was calibrated against experimental observations, and a modification factor model was proposed to account for the 3D phenomenalistic behavior of the pullout behavior. Realistic predictions were obtained by using this factor to predict the entire pullout-slip curves and independent results for the peak pullout load. The numerical results indicated that the increased fiber diameter would alter the mode of crack opening from fiber–matrix damage to that combined with matrix spalling, which can neutralize the sensitivity of the entire pullout response of hooked-end steel fiber to embedment depth. Additionally, the fiber–matrix bond was enhanced by increasing the fiber’s surface area, sensibly leading to a higher pullout peak load and toughness. The developed FE model was also proficient in predicting microstructural stress distribution and deformations during the crack opening of SFRC. This model could be extended to fully model a loaded SFRC composite material by the inclusion of various randomly oriented dosages of fibers in the concrete block.

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