Mechanical behavior of steel fiber‐reinforced self‐compacting concrete corbels after exposure to elevated temperatures

Abdulhaleem, Khamees N.; Gülşan, Mehmet Eren; Çevik, Abdülkadir

doi:10.1002/suco.201700034

Cited by 20 publications

(19 citation statements)

References 40 publications

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“…HSC with high strength and durability shows lower performance than normal strength concretes under high temperature effect 1,2 . Many previous studies have indicated that high temperature negatively affects the mechanical properties of HSC 2–5 and other concretes 6–18 . Schneider 19 demonstrated that the type of aggregate, heating and cooling down process and moisture content are parameters that influence most the mechanical properties of the concrete.…”

Section: Introductionmentioning

confidence: 98%

Mechanical properties of high strength concrete made with pyrophyllite aggregates exposed to high temperature

Demez

Karakoç

2020

Structural Concrete

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This paper presents the results of an experimental research on the assessment of the residual mechanical properties of high strength concretes (HSCs) made with pyrophyllite aggregate (PA) after high temperature. In the study, HSC mixtures with varying PA ratios (0, 25, 50, 75, and 100%) were subjected to elevated temperature (150, 300, 450, 600, and 750°C) and then cooled in two different cooling regimes (air and water‐cooling). The properties examined included compressive strength, weight loss, effects of cooling regime, and microstructure of HSC. The results of the study show that the increase in the PA ratios leads to a decrease in the compressive strength values. The results showed that weight loss of the specimens decreased with increasing PA ratios. It was found that the compressive strength values of HSC with PA cooled in air‐cooling are higher than that cooled in water. When the compressive strength loss and the weight loss values are taken into consideration according to the control samples, the group with the highest resistance to high temperature (750°C) effect was 100% PA group. Also, the internal structures of the samples exposed to high temperature were examined using scanning electron microscope and visual observations.

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Section: Introductionmentioning

confidence: 98%

Mechanical properties of high strength concrete made with pyrophyllite aggregates exposed to high temperature

Demez

Karakoç

2020

Structural Concrete

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“…Moreover, the fire resistance of the innovated additions including fiber and LWAs are also vital in construction applications. 22 When it comes to the fire resistance of fiber, Liu et al 23 denoted that the polypropylene (PP) fiber effectively drop down the risk of spalling despite the inconsistent mechanical and thermal properties from varying preparation methodologies. Faiyadh and Al-Ausi 24 explained the heating treatment lead to the ITZ debonding between fiber and matrix even before applied external loading, diminishing the positive influence of fiber reinforcement.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the fire resistance of the innovated additions including fiber and LWAs are also vital in construction applications . When it comes to the fire resistance of fiber, Liu et al denoted that the polypropylene (PP) fiber effectively drop down the risk of spalling despite the inconsistent mechanical and thermal properties from varying preparation methodologies.…”

Section: Introductionmentioning

confidence: 99%

Fiber‐reinforced lightweight self‐compacting concrete incorporating scoria aggregates at elevated temperatures

Aslani

Sun

Bromley

et al. 2019

Structural Concrete

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Self‐compacting concrete (SCC) has developed rapidly in modern concrete structures to accommodate the need of high deformability and considerable resistance to segregation. The lightweight aggregate called scoria is also utilized to manufacture lightweight self‐compacting concrete (LWSCC) to improve the strength‐to‐weight ratio with considerable cost beneficial. Meanwhile, the LWSCC employs fibers (polypropylene [PP] and steel) equipping different replacement ratios of traditional aggregates, the SCC will be invented to reveal balanced fresh property, spalling behavior, mechanical performance especially at elevated temperatures. In this study, eight LWSCC mix designs were explored with varying fiber ratios by volume of PP fiber (0.1, 0.15, 0.20, and 0.25%) and steel fiber (0.25, 0.5, 0.75, and 1.0%). The effects of different fiber types and ratios are tested with fresh properties (slump flow and J‐ring), hardened mechanical performance (compressive and tensile strength at 20°C) and high temperature resistance (compressive and tensile strength, mass loss and spalling) after 28‐day curing at 100, 300, 600, and 900°C. The 0.25% optimum fiber ratio for PP fiber mix and 0.75% for steel fiber mix are determined with balanced fresh properties as well as high‐temperature resistance for the hardened properties.

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“…Because of the prevalence of precast concrete, the design of corbels has become increasingly important. Many experimental studies have been conducted (Abdulhaleem et al, 2018; Campione, 2009; Fattuhi, 1994; Fattuhi and Hughes, 1989; Foster et al, 1996; Gulsan and Shaikhan, 2018; Kriz and Raths, 1965; Kurtoglu et al, 2017; Mattock et al, 1976; Yong and Balaguru, 1994). The experimental studies proved that the ultimate strength of reinforced concrete corbels is influenced mostly by the shear span-to-effective depth ratio, the compressive strength of the concrete, the patterns and amount of reinforcing bars, and the geometrical shape.…”

Section: Introductionmentioning

confidence: 99%

An optimum indeterminate strut-and-tie model for reinforced concrete corbels

Yun

Chae²

2019

Advances in Structural Engineering

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The failure behavior of a reinforced concrete corbel is complicated due to the shear span-to-effective depth ratio, reinforcement patterns, load conditions, and material properties. In this study, an optimum first-order indeterminate strut-and-tie model that reflects all characteristics of the failure behavior is proposed for the rational design of reinforced concrete corbels with a shear span-to-effective depth ratio of less than 1.0. A load distribution ratio that transforms the indeterminate strut-and-tie model into a determinate model is also developed to help structural designers design reinforced concrete corbels using the strut-and-tie model methods of current design codes. For the development of the load distribution ratio, a material nonlinear finite element analysis of the proposed first-order indeterminate strut-and-tie model was conducted repeatedly by changing the combination of primary design variables of the corbels. To examine the validity of our results, the ultimate strengths of 294 reinforced concrete corbels tested to failure by other investigators were predicted using the proposed strut-and-tie model with the load distribution ratio, the existing determinate strut-and-tie models representing arch and truss load transfer mechanisms, and the American Concrete Institute 318 conventional design method based on a shear friction theory. The ultimate strengths predicted by the proposed strut-and-tie model agreed fairly well with the experimental results. The ratio of the experimental strength to the predicted strength (and coefficient of variation) was 1.09 (28.0%), implying that the proposed strut-and-tie model can represent the load transfer mechanisms of corbels most appropriately.

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Mechanical behavior of steel fiber‐reinforced self‐compacting concrete corbels after exposure to elevated temperatures

Cited by 20 publications

References 40 publications

Mechanical properties of high strength concrete made with pyrophyllite aggregates exposed to high temperature

Mechanical properties of high strength concrete made with pyrophyllite aggregates exposed to high temperature

Fiber‐reinforced lightweight self‐compacting concrete incorporating scoria aggregates at elevated temperatures

An optimum indeterminate strut-and-tie model for reinforced concrete corbels

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