Performance of concrete containing recycled springs in post-fire conditions

Pachideh, Ghasem; Gholhaki, Majid; Moshtagh, Amin

doi:10.1680/jstbu.18.00042

Cited by 12 publications

(10 citation statements)

References 42 publications

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“…Six target temperatures ( T u ) of 25, 100, 250,500,700, and 900°C were selected. The target temperatures were selected according to the behavior of concrete in different conditions which have been investigated in previous studies 23,24 . After reaching the target temperature, temperature will be constant for 60 min until the sample reaches thermal stability stage and uniform distribution of heat is achieved.…”

Section: Test Methodsmentioning

confidence: 99%

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An experimental study to evaluate the postfire mechanical properties of concrete specimens

Daryan

Bakhtiari

Ghasemi

2020

Structural Concrete

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In this research, the mechanical behavior of structural concrete made with materials in Iran has been experimentally investigated after experiencing high temperatures. For this purpose, six different mix designs were selected in accordance with Iranian Concrete Standard (ABA). Six different target temperatures (25, 100, 250, 500, 700, and 900°C) were also selected for the purpose of fire experience. Compressive and tensile strength tests were carried out on all of the samples and their behavior was evaluated after experiencing different target temperatures. The results show a strong drop in compressive and tensile strength at temperatures above 700°C. It can be noted that at 900°C all specimens lost their strength. Finally, thanks to the large number of experiments, different relationships are presented based on the results to determine the mechanical properties of different mix designs at different temperature levels.

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Section: Test Methodsmentioning

confidence: 99%

“…The study of concrete delamination and its mechanical properties are the most important focuses of this research. Pachideh et al 23,24 investigated the performance of concrete containing recycled springs, steel, and polypropylene fibers at different temperatures.…”

Section: Introductionmentioning

confidence: 99%

An experimental study to evaluate the postfire mechanical properties of concrete specimens

Daryan

Bakhtiari

Ghasemi

2020

Structural Concrete

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“…According to the previous research, the volume fraction of 0.4% was considered as an optimum and suitable mix design for fibers and springs 24 . Note that using more than 0.6% of metal springs may cause the increasing possibility of their intertwist 25 …”

Section: Experimental Programmentioning

confidence: 99%

“…The high temperatures led to evaporating the water inside the concrete. This matter contributed to the porosity or so‐called crystallization of the concrete 25 …”

Section: Experimental Programmentioning

confidence: 99%

Strength of SCLC recycled springs and fibers concrete subject to high temperatures

Pachideh

Toufigh

2021

Structural Concrete

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In this article, the self‐compacting lightweight concretes (SCLC) with different fibers were prepared and exposed to elevated temperatures, and their mechanical properties were investigated. Three types of fibers were steel fibers (SF), polypropylene fibers (PPF), and metal springs with a volume fraction of 0.4%. One hundred and fifty cylindrical specimens were prepared, and the compression, tensile and flexural tests were carried out on them after exposure to high temperatures ranging from 25 to 700°C. The findings indicate that incorporation of steel fibers and springs enhanced the compressive strength of concrete by 20% compared to the control specimen. Meanwhile, the polypropylene fibers increased the tensile strength up to 70% after exposure to the elevated temperatures. The flexural strength of concrete in all specimens was dramatically reduced at the temperature of 700°C. Following an increase in temperature, the bending‐induced strain energy in the specimens containing steel fibers and metal spring increased by 70% and 88% in contrast to the control specimen. Conversely, the strain energy of the specimens containing polypropylene reduced by 70%. For all concrete mixes, the threshold temperature for severe strength loss in the compressive, tensile, and flexural strength tests was 500°C, and the strengths of concrete specimens decreased remarkably at the temperature of 700°C. Finally, the use of metal springs could relatively enhance the mechanical properties of SCLC and reduce the cost.

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“…It was observed that the presence of the spring decreases cracks’ depth and width. It was found that incorporation of 0.2% spring, is regarded as the optimum ratio (Pachideh et al, 2020). In 2019, Pachideh and Gholhaki attempted to evaluate the effect of steel and polypropylene fibers as well as metal springs on the post-heat behavior of ordinary concretes.…”

Section: Introductionmentioning

confidence: 99%

An experimental study on the performance of fine-grained concrete incorporating recycled steel spring exposed to acidic conditions

Pachideh

Gholhaki

2020

Advances in Structural Engineering

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This article aims to study the effects of adding steel fibers and galvanized recycled spring on mechanical properties and crack development in the fine-grained concrete exposed to the acidic environment containing magnesium sulfate. To this end, specimens containing 0.3% and 0.6% of steel fibers and springs, respectively, by concrete volume, were built in normal temperature using 10 cm × 20 cm standard steel formworks so as to conduct the compressive and tensile strength tests. All specimens were cured in 28 days exposed to the environment containing 0%, 5%, and 10% of magnesium sulfate. Based on the results, addition of steel fibers and recycled spring improves the compressive and tensile strength by 50% and 60%, respectively. Moreover, the specimens containing recycled spring better withstood against the acidic environments in comparison with the specimens including steel fibers. In general, it was found that due to the negligible difference between the strength of the specimens, the application of metal-recycled spring in the fine-grained concrete is technically and economically justifiable.

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Performance of concrete containing recycled springs in post-fire conditions

Cited by 12 publications

References 42 publications

An experimental study to evaluate the postfire mechanical properties of concrete specimens

An experimental study to evaluate the postfire mechanical properties of concrete specimens

Strength of SCLC recycled springs and fibers concrete subject to high temperatures

An experimental study on the performance of fine-grained concrete incorporating recycled steel spring exposed to acidic conditions

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