The Mechanical Properties and Damage Evolution of UHPC Reinforced with Glass Fibers and High-Performance Polypropylene Fibers

He, Jiayuan; Chen, Weizhen; Zhang, Boshan; Yu, Jiangjiang; Liu, Hang

doi:10.3390/ma14092455

Cited by 24 publications

(9 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Typically, the modulus of elasticity and compressive strength are similar to those for concrete without fibers. On the other hand, the fibers will have a very positive effect on ductility, toughness and freeze-thaw resistance, and will significantly reduce shrinkage, crack width and spalling during fire [ 14 , 22 ]. Properties such as abrasion resistance, tensile strength and flexural tensile strength will also be improved [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

Flexural Tensile Strength of Concrete with Synthetic Fibers

Blazy

Drobiec

Wolka³

2021

Materials

View full text Add to dashboard Cite

Fiber reinforcement is currently most often used in floors, railway sleepers, prefabricated structural elements such as slabs, beams and tanks, and in small architecture elements. Designing elements or structures made of fiber-reinforced concrete requires knowledge of its basic mechanical parameters. In the case of concretes with metallic fibers, the literature can find many tests and standard guidelines regarding compressive, flexural, tensile strength and fracture energy. The properties of concretes with non-metallic fibers are slightly less recognized, especially concretes with new types of polymer fibers. Additionally, the lack of standardized methods of testing concrete with polymer fibers make their application much more difficult. In the article, the possibility of using the EN 14651 standard to assess the flexural tensile strength of concrete with the addition of 2.0 and 3.0 kg/m3 of synthetic fibers with different geometry and form was presented. There was a 5.5–13.5% increase in the flexural tensile strength depending on the mixture type. Moreover, in the case of fiber-reinforced concretes, the ductility was enhanced and the samples were characterized by significant residual flexural tensile strengths. Additionally, from the workability tests it was concluded that after the incorporation of fibers, the consistency class decreased by one, two or three. Nevertheless, the compressive strengths of concrete with and without fibers were very similar to each other, and varied from 58.05 to 61.31 MPa. Moreover, it was concluded that results obtained from three-point bending tests significantly differed from empirical formulas for the calculation of the flexural tensile strength of fiber-reinforced concretes with dispersed steel fibers present in the literature. As a result, the new formula determined by the authors was proposed for concrete with polymer fibers with a nominal fiber content ≤1.0% and slenderness of up to 200. It must be mentioned that the formula gave a very good agreement with studies presented in different literature positions. In addition, an attempt was made to evaluate the strengths of tested mixes in accordance with the Model Code 2010. However, it occurred that the proposed fiber-reinforced concrete mixtures would not be able to replace traditional reinforcement in a form of steel bars. Furthermore, in uniaxial tensile tests, it was not possible to determine the σ–w graphs, and received results for maximum tensile strength did not show the clear influence of fibers incorporation on concrete. Then, the fracture energy enhancement (from about 16 to 22 times) and dependencies: crack mouth opening displacement–deflection; crack mouth opening displacement–crack tip opening displacement; and crack tip opening displacement–deflection were analyzed. Finally, the results from flexural tensile tests were compared with measurements of the surface displacement field obtained through the Digital Image Correlation technique. It was concluded that this technique can be successfully used to determine the crack mouth and crack tip opening displacements with very high accuracy.

show abstract

Section: Introductionmentioning

confidence: 99%

Flexural Tensile Strength of Concrete with Synthetic Fibers

Blazy

Drobiec

Wolka³

2021

Materials

View full text Add to dashboard Cite

show abstract

“…They found that, due to interlocking between the fibers, an increase in the amount of steel fiber and its aspect ratio had a negative impact on workability. He et al [ 16 ] used glass fiber (GF) and high-performance polypropylene (HPP) fibers to prepare UHPC and studied the effect of these fibers on its mechanical properties. Their research results show that the improvement effect of glass fiber was more significant compared with HPP-UHPC.…”

Section: Introductionmentioning

confidence: 99%

Flexural Behavior of Ultra-High-Performance Fiber-Reinforced Concrete Beams after Exposure to High Temperatures

Chen

Lin

et al. 2021

Materials

View full text Add to dashboard Cite

Due to the dense structure of ultra-high-performance concrete (UHPC), it is prone to explosive spalling at high temperatures. In this paper, flexural testing of UHPC and high-strength concrete (HSC) beams was carried out at room temperature and after being subjected to different levels of thermal exposure (300–500 °C). The cross-section of the beam specimen was 150 (width) × 200 (depth) mm, and its length was 1500 mm. The flexural and shear design of the beam specimens were carried out in accordance with the ACI 318M-14 code. All of the beams were singly reinforced with two #4 rebars (minimum reinforcement ratio) as a longitudinal tensile reinforcement at the bottom of the specimen and at an effective depth of 165 mm. The flexural load was applied using the three-point load method. The results show that, at room temperature and after being subjected to different thermal exposures, compared with the HSC specimens, the stiffness of the UHPC specimens in the post-cracking stage was relatively larger and the deflection under a given load was smaller. Moreover, whether at room temperature or after exposure to different thermal exposures, the ductility of the UHPC specimens was better than that of the HSC specimens.

show abstract

“…The bridging effect in UHPC due to steel fibers can be enhanced by optimizing the content (≤3%), orientation (<45 °), and distribution of steel fibers to evade the accumulation of fibers in a way to prevent stress from transferring from the matrix to the steel fibers (Gong et al, 2022). This bridging phenomenon due to addition of fibers is illustrated in Figure 12, as presented by He et al (2021). The scanning electronic microscopic view of the interfacial transition zone (ITZ) of steel fiber-reinforced concrete UHPC is illustrated in Figure 13, as presented by You et al (2017).…”

Section: Figure 11mentioning

confidence: 99%

An overview of progressive advancement in ultra-high performance concrete with steel fibers

et al. 2022

View full text Add to dashboard Cite

A progressive advance in the construction sector is attained by employing ultra-high performance concrete (UHPC) technology. Rigorous efforts have been made in this research domain to have remarkable quality levels with 150 MPa or more strength and significant durability, which was impossible previously. Steel fiber incorporation in UHPC is vital in improving its mechanical characteristics. This review on the incorporation of steel fibers in UHPC evaluates, identifies, and synthesizes research outcomes for creating a summary of current evidence that can contribute to evidence-based practice. This study summarized a review of the literature on steel fibers’ effect on UHPC, intending to explore its essential aspects. The aim is to summarize the literature in this research domain and provide guidance for future research. Moreover, the basic requirements and materials, mixing and casting, mechanical properties, modern applications, advantages and disadvantages, and future perspectives associated with steel fibers reinforced UHPC in the construction sector are discussed. It is revealed from the conducted analysis that the most widely applied keyword is “steel fibers.” Due to the graphical illustration of the contributing studies, the current work may benefit academic scholars in sharing novel techniques and ideas and establishing collaborative efforts. Furthermore, the present work reveals that steel fibers have the potential to enhance the mechanical properties of UHPC; however, the large-scale production and applications of steel fiber-reinforced UHPC are controlled by parameters like fiber content and geometry.

show abstract

The Mechanical Properties and Damage Evolution of UHPC Reinforced with Glass Fibers and High-Performance Polypropylene Fibers

Cited by 24 publications

References 38 publications

Flexural Tensile Strength of Concrete with Synthetic Fibers

Flexural Tensile Strength of Concrete with Synthetic Fibers

Flexural Behavior of Ultra-High-Performance Fiber-Reinforced Concrete Beams after Exposure to High Temperatures

An overview of progressive advancement in ultra-high performance concrete with steel fibers

Contact Info

Product

Resources

About