The effect of testing conditions (hot and residual) on fracture toughness of fiber reinforced high-strength concrete subjected to high temperatures

Watanabe, Kazuo; Bangi, Mugume Rodgers; Horiguchi, T.

doi:10.1016/j.cemconres.2013.04.003

Cited by 30 publications

(6 citation statements)

References 8 publications

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“…Moreover, the enhancement of the unstable fracture toughness from the addition of steel fibers was greater than that of the initiation fracture toughness, and the former was approximately twice that of the latter. Watanabe et al [75] analyzed the fracture energy of different fiber-reinforced high-strength concrete in hot and residual tests, at temperatures ranging from 20 to 600 • C. The experimental results indicated that the fracture energy of plain concrete and polypropylene-fiber-reinforced concrete was similar, but the fracture energy of hybrid steel and polypropylene-fiber-reinforced concrete was higher than those of plain concrete and polypropylene-fiber-reinforced concrete. The main mechanisms for amelioration in the fracture properties of concrete is as follows: steel fibers can bridge the microcracks inside concrete and restrict the development of cracks, and steel fibers can decelerate the volume change caused by the temperature gradient of concrete by increasing the heat transfer coefficient of concrete [13,33,[75][76][77].…”

Section: Residual Fracture Propertiesmentioning

confidence: 99%

Mechanical Properties and Explosive Spalling Behavior of Steel-Fiber-Reinforced Concrete Exposed to High Temperature—A Review

et al. 2020

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Steel-fiber-reinforced concrete (SFRC) is being increasingly applied to various buildings and civil infrastructure as an advanced cementitious composite. In recent years, the requirements for SFRC in the construction industry have increased. Additionally, the fire resistance of SFRC has attracted attention; therefore, numerous investigations regarding the residual properties of SFRC have been conducted. This paper critically reviews the mechanical properties of SFRC subjected to elevated temperatures, including its residual compressive strength, flexural strength, tensile strength, elastic properties, fracture properties, and stress–strain relationships. The residual mechanical performance of SFRC and the action mechanism of steel fibers are reviewed in detail. Moreover, factors affecting the explosive spalling of concrete at high temperatures as well as the effect of steel fibers on the microstructure of heated concrete are discussed. It is demonstrated that, in general, SFRC exhibits better residual mechanical properties when exposed to elevated temperatures than plain concrete and can prevent the risk of explosive spalling more effectively. The purpose of this literature review is to provide an exhaustive insight into the feasibility of SFRC as a refractory building material; additionally, future research needs are identified.

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Section: Residual Fracture Propertiesmentioning

confidence: 99%

Mechanical Properties and Explosive Spalling Behavior of Steel-Fiber-Reinforced Concrete Exposed to High Temperature—A Review

et al. 2020

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“…1 The mechanism and improvement effect of different fibers are different on the mechanical properties of concrete. Currently, most of the studies focused on the concrete with steel fibers, 7,8 polypropylene fibers, 9,10 and hybrid fibers, 10 when the concrete was exposed to high temperatures. In recent years, much attention has been paid to basalt fiber-reinforced concrete.…”

Section: Introductionmentioning

confidence: 99%

Fracture behavior of basalt fiber‐reinforced concrete subjected to high temperatures

Wang

Zhao

Song

et al. 2022

Structural Concrete

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The three‐point bending test was conducted and the digital image correlation (DIC) technique was used to observe the full‐field displacement and strain of the notched beam. The initial cracking load and the crack mouth opening displacement were determined based on the deformation field near the tip and mouth of the notch. The initial cracking toughness Kini and the unstable fracture toughness Kun calculated according to the double‐K fracture model, the fracture energy GF and the ductility index Du determined with a modified method, and the equivalent fracture toughness K at four different deformation stages, were analyzed under different temperatures and basalt fiber contents. The results showed that Kini exhibited a monotonic decrease trend with the increasing temperature, indicating that the notched beam was prone to initial cracking after high temperatures. However, Kini rose slowly with the increase of the fiber content, suggesting that the basalt fiber had little influence on Kini. At the temperatures below 400°C, the Kun, GF, Du, and K at each deformation stage increased with the rise of temperature. At the temperatures above 400°C, the Kun, GF, Du, and K at each deformation stage apparently decreased with the increase of temperature. Under the current test conditions, the basalt fiber content of 0.4% by volume had the greatest improvement on the fracture performances of concrete after high temperatures.

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“…Many investigations have been carried out into the fracture toughness of high performance concrete at room temperature, but the information about its performance at high temperatures is still limited. Extensive research into fracture properties of concrete at high temperatures only started about four decades ago and much progress has since been made (RILEM 1985, Schneider 1988, Bažant and Kaplan 1996, Phan and Carino 1998, Zhang et al 2000a, 2000b, 2000c, Cülfik and Ö zturan 2002, Peng et al 2006, Zhang and Bićanić 2006, Kanellopoulos et al 2009, Ulm and James 2011, Watanabe et al 2013.…”

Section: Introductionmentioning

confidence: 99%

“…Nowadays super high strength high performance with compressive strength over 250 MPa or even up to 300 MPa has been manufactured and applied into practical concrete construction (Nielson 1995, Haghighi et al 2007, Pu 2012. To date, much research has been conducted on the strength and stiffness of high performance concrete at varied heating scenarios (Felicetti and Gambarova 1998, Abe et al 1999, Zhang et al 2000a, Zhang and Bićanić 2002a, Chen and Liu 2004, Peng et al 2006, Watanabe et al 2013, and has indicated that the strength and stiffness of concrete decreased with increasing heating temperature, exposure time and thermal cycles. Some research has also been done on the toughness of high performance concrete (Zhang et al 2000b, 2000c, Nielson and Bićanić 2003, Zhang and Bićanić 2006, Kanellopoulos et al 2009, Watanabe et al 2013, Yu and Lu 2013.…”

Section: Introductionmentioning

confidence: 99%

Fracture toughness of high performance concrete subjected to elevated temperatures Part 1 The effects of heating temperatures and testing conditions (hot and cold)

Zhang¹,

Cullen²,

Kilpatrick³

2014

Advances in concrete construction

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In this study, the fracture toughness K IC of high performance concrete (HPC) was determined by conducting three-point bending tests on eighty notched HPC beams of 500 mm × 100 mm × 100 mm at high temperatures up to 450ºC (hot) and in cooled-down states (cold). When the concrete beams exposed to high temperatures for 16 hours, both thermal and hygric equilibriums were generally achieved. K IC for the hot concrete sustained a monotonic decrease tendency with the increasing temperature, with a sudden drop at 105ºC. For the cold concrete, K IC sustained a two-stage decrease trend, dropping slowly with the heating temperature up to 150ºC and rapidly thereafter. The fracture energy-based fracture toughness K IC ' was found to follow similar decrease trends with the heating temperature. The weight loss, the fracture energy and the modulus of rapture were also evaluated.

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The effect of testing conditions (hot and residual) on fracture toughness of fiber reinforced high-strength concrete subjected to high temperatures

Cited by 30 publications

References 8 publications

Mechanical Properties and Explosive Spalling Behavior of Steel-Fiber-Reinforced Concrete Exposed to High Temperature—A Review

Mechanical Properties and Explosive Spalling Behavior of Steel-Fiber-Reinforced Concrete Exposed to High Temperature—A Review

Fracture behavior of basalt fiber‐reinforced concrete subjected to high temperatures

Fracture toughness of high performance concrete subjected to elevated temperatures Part 1 The effects of heating temperatures and testing conditions (hot and cold)

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