A new post-peak behavior assessment approach for effect of steel fibers on bond stress-slip relationship of concrete and steel bar after exposure to high temperatures

Fakoor, Maziar; Nematzadeh, Mahdi

doi:10.1016/j.conbuildmat.2021.122340

Cited by 31 publications

(8 citation statements)

References 51 publications

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“…Although the role of fiber might not always involve an increase in strength, it has a considerable favorable effect on ductility, resilience to dynamic loading, and toughness [ 29 , 30 , 31 , 32 , 33 , 34 , 35 ]. Concrete reinforcement with fibers is not a substitute for traditional steel reinforcing bars because steel bars and fibers serve distinctive, but both function in improving the concrete performance [ 36 , 37 , 38 ]. Steel fiber-reinforced concrete (SFRC) refers to the inclusion of short, discontinuous steel fibers into the matrix of concrete after mixing [ 39 , 40 , 41 ].…”

Section: Introductionmentioning

confidence: 99%

Steel Fiber-Reinforced Concrete: A Systematic Review of the Research Progress and Knowledge Mapping

et al. 2022

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This study performed a scientometric-based examination of the literature on steel fiber-reinforced concrete (SFRC) to identify its key elements. Typical review papers are limited in their capacity to link distinct segments of the literature in an organized and systematic method. The most challenging aspects of current research are knowledge mapping, co-occurrence, and co-citation. The Scopus search engine was used to search for and obtain the data required to meet the goals of the study. During the data evaluation, the relevant publication sources, keyword assessment, productive authors based on publications and citations, top papers based on citations received, and areas vigorously involved in SFRC studies were recognized. The VOSviewer software tool was used to evaluate the literature data from 9562 relevant papers, which included citation, abstract, bibliographic, keywords, funding, and other information. Furthermore, the applications and constraints related to the usage of SFRC in the construction sector were examined, as well as potential solutions to these constraints. It was determined that only 17 publication sources (journals/conferences) had published at least 100 articles on SFRC up to June 2022. Additionally, the mostly employed keywords by authors in SFRC research include steel fibers, fiber-reinforced concrete, concrete, steel fiber-reinforced concrete, and reinforced concrete. The assessment of authors revealed that 39 authors had published at least 30 articles. Moreover, China, the United States, and India were found to be the most active and participating countries based on publications on SFRC research. This study can assist academics in building collaborative initiatives and communicating new ideas and techniques because of the quantitative and graphical depiction of participating nations and researchers.

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Section: Introductionmentioning

confidence: 99%

Steel Fiber-Reinforced Concrete: A Systematic Review of the Research Progress and Knowledge Mapping

et al. 2022

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“…Apparently, no additional bond-strength-deterioration trend can be identified compared to the residual compressive strength of concrete. Some researchers have identified that it follows a trend similar to the concrete residual compressive strength deterioration [86,104,108,109,111]; in contrast, there are also reports on the bond strength been more affected than the compressive strength [91,96,110]. Similar conflicting results have been reported for the bar slip at maximum bond strength.…”

Section: Effect Of Elevated Temperature Exposure On Bond Strength And...mentioning

confidence: 86%

“…The c/d ratio is directly related to the bond failure mechanism, as the confinement provided by the concrete cover may define the extent of the pull-out splitting cracks. As the exposure temperature increases and the c/d ratio declines, the failure of the specimen tends toward the splitting failure mode [106,108].…”

Section: Concrete Cover and Bar Diametermentioning

confidence: 99%

“…On the other hand, specimens with smaller c/d generally fail by splitting of the concrete cover and are comparable to the pattern of the tensile strength reduction. Furthermore, there is a substantial reduction in absolute peak bond strength when bond failure mode changes from bar pull-out to splitting [86,104,108].…”

Section: Concrete Cover and Bar Diametermentioning

confidence: 99%

“…Therefore, the use of fibers leads to a large decrease in the extent of the pressure fields that build up in the concrete during heating, hence reducing internal pressure damage and spalling effects [57,95,[116][117][118]. At the same time, the significant increase in void proportion may also lead to strength reduction and material softening after exposure to elevated temperature [50,108,117,119].…”

Section: Residual Bond Of Fiber-reinforced Concretementioning

confidence: 99%

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Experimental evaluation of the residual concrete-reinforcement bond after exposure to elevated temperatures

Andrade¹

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The composite behavior of reinforced concrete structures is directly related to the bond between concrete and reinforcement. When a reinforced concrete structure is subjected to a fire event, the bond is damaged and the force-transfer mechanism is compromised, as well as the resistant capacity of the structure itself. This study consists of a review of post-fire concrete- reinforcement bond relationship and an experimental assessment of the influence of exposure to elevated temperatures on the bond between these materials. First, it was reviewed the state- of-the-art research on post-fire bond properties, as well as the parameters influencing bond relationship development after exposure to elevated temperatures. This work also presents an experimental assessment of the influence of degradation of concrete and reinforcing steel, induced by elevated temperatures, on the bond relationship between the materials and the influence of concrete cover to bar diameter ratio on concrete-reinforcement bond failure mechanism. The findings showed that bond degradation is directly related to the damage to the concrete and that the reinforcing steel is negligibly affected by temperatures under 600 ºC. It was also observed that exposure at 200 ºC had a positive effect both on the residual mechanical properties of concrete and residual bond strength. Exposure to higher temperatures progressively reduced the mechanical properties of concrete and the bond strength measured after the fire situation. Moreover, the bond failure mechanism was observed to shift from pull- out to splitting due to the concrete damage at elevated temperatures, although it could not be easily distinguished. It was also concluded that, even though the data available on the literature are extremely scattered, the bond strength prescribed by international standards for structures design is safe both at room temperature and after exposure to elevated temperatures. Keywords: Reinforced concrete. Bond strength. Elevated temperatures. Bond-slip relationship. Bond failure mechanism.

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Effect of fiber type on the mechanical properties and durability of hardened concrete

Zhang,

Zhou,

Zheng

2023

J Mater Sci

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A new post-peak behavior assessment approach for effect of steel fibers on bond stress-slip relationship of concrete and steel bar after exposure to high temperatures

Cited by 31 publications

References 51 publications

Steel Fiber-Reinforced Concrete: A Systematic Review of the Research Progress and Knowledge Mapping

Steel Fiber-Reinforced Concrete: A Systematic Review of the Research Progress and Knowledge Mapping

Experimental evaluation of the residual concrete-reinforcement bond after exposure to elevated temperatures

Effect of fiber type on the mechanical properties and durability of hardened concrete

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