Effect of Fibers on High-Temperature Mechanical Behavior and Microstructure of Reactive Powder Concrete

Abid, Muhammad; Hou, Xuyan; Zheng, Wenzhong; Hussain, Raja Rizwan

doi:10.3390/ma12020329

Cited by 61 publications

(36 citation statements)

References 53 publications

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“…This behavior was valid for burning temperatures of 400 and 500 • C in cases of gradual and foam cooling, while there was a reduction in the amount of compressive strength in cases of 1.0% and 1.5% in sudden-cooling method, as shown in Figure 5b,c. These facts were also proved by other research [25][26][27][28].…”

Section: Compressive Strengthsupporting

confidence: 81%

Influence of Cooling Methods on the Behavior of Reactive Powder Concrete Exposed to Fire Flame Effect

Awad

2020

Fibers

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The construction of highly safe and durable buildings that can bear accident damage risks including fire, earthquake, impact, and more, can be considered to be the most important goal in civil engineering technology. An experimental investigation was prepared to study the influence of adding various percentages 0%, 1.0%, and 1.5% of micro steel fiber volume fraction (Vf) to reactive powder concrete (RPC)—whose properties are compressive strength, splitting tensile strength, flexural strength, and absorbed energy—after the exposure to fire flame of various burning temperatures 300, 400, and 500 °C using gradual-, foam-, and sudden-cooling methods. The outcomes of this research proved that the maximum reduction in mechanical properties is detected in case of 0% addition at burning temperature of 500 °C using sudden cooling to be 63.90%, 55.77% and 53.8% for compressive, splitting tensile, and flexural strength, respectively, while using 1.5% produced a modification in compressive strength, splitting tensile strength, and flexural strength to 6.67%, 4.15%, and 7.00% respectively, and 7.10 kN·mm for the absorbed energy for gradual cooling at 300 °C. From the results, the adopted cooling methods can be ordered according to their negative influence by sudden, foam, and gradual, while the optimum percentage of (Vf) is 1.5% when burning at 300 °C for all methods of cooling. 1.0% is considered the optimum percentage for all burning temperatures that exceed 400 °C using sudden-cooling method.

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Section: Compressive Strengthsupporting

confidence: 81%

Influence of Cooling Methods on the Behavior of Reactive Powder Concrete Exposed to Fire Flame Effect

Awad

2020

Fibers

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“…A comparison of the unit weights of the mixtures after one and six thermal cycles is shown in Figure 9. e slope of the unit weights from ambient temperature up to 300°C was steep, which resulted from the evaporation of free water and bound water [20]. When the UHPC contained a steel fiber content of 1.0%, the reduction in the unit weight from one up to six thermal cycles was 0.6, 0.6, and 0.1% for the maximum temperatures of 300, 400, and 500°C, respectively.…”

Section: Effects Of the Maximum Temperature And Steel Fibermentioning

confidence: 98%

“…Free water and bound water in the cement paste begin to evaporate when the temperature reaches 200°C, and most of bound water evaporates when the temperature approaches 500°C. In addition, the decomposition of CH and C-S-H hydrates begins when the temperature ranges from 400 to 500°C [20]. e decomposition of CH and C-S-H hydrates makes the cement matrix more porous.…”

Section: Effects Of the Maximum Temperature And Steel Fibermentioning

confidence: 99%

“…Abid et al [20] investigated mechanical behavior and the microstructure of RPC at high temperatures of 120, 300, 500, 700, and 900°C.…”

Section: Investigation Of the Specimen Microstructuresmentioning

confidence: 99%

“…Moreover, the high tensile strength of UHPC provides a high resistance to thermal cracking. However, studies on the mechanical and thermal properties of UHPC specimens exposed to high-temperature thermal cycles are still limited, whereas some investigations on the deterioration of UHPC and reactive powder concrete (RPC) specimens under a single thermal exposure to fire have been performed [18][19][20]. erefore, to apply UHPC as a solid media for thermal energy storage, studies must be performed on the mechanical and thermal properties of UHPC specimens under high-temperature thermal cycles.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical and Thermal Properties of UHPC Exposed to High-Temperature Thermal Cycling

Yang

Park

2019

Advances in Materials Science and Engineering

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The effects of high-temperature thermal cycling (temperatures up to 500°C) and steel fiber contents on the mechanical and thermal properties of ultrahigh-performance concrete (UHPC) containing polypropylene (PP) fibers were investigated in this study. The different maximum temperatures for thermal cycling included 300, 400, and 500°C. The mechanical properties, including the compressive strength and tensile strength, and thermal properties, including the unit weight and thermal conductivity, of the UHPC specimens were measured. The experimental results indicated that the compressive strength, tensile strength, unit weight, and thermal conductivity decreased as the temperature increased to 500°C. Test results showed that for each maximum temperature, the reduction of the thermal conductivities from one to six thermal cycles was not significant. The thermal conductivity of the UHPC decreased as the unit weight of the UHPC decreased, and the thermal conductivity also decreased as the compressive strength of the UHPC decreased. Scanning electron microscopy (SEM) analysis showed that the microstructures of the UHPC specimens exposed to high temperatures contained voids due to the PP fiber melting. The porosity of the UHPC specimens increased as the maximum temperature of the thermal cycles increased, which decreased the unit weights and thermal conductivities of the UHPC specimens. Moreover, the porosity at a temperature of 500°C increased by 60.0, 74.5, and 123.4% for steel fiber contents of 1.0, 1.5, and 2.0%, respectively. It might be due to incompatible thermal expansion between the concrete matrix and steel fiber.

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Effect of temperature on mechanical properties of ultra‐high performance concrete

Banerji

Kodur

2021

Fire and Materials

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High temperature mechanical property data are needed for evaluating fire resistance of structural members. Being a relatively new construction material, there is a lack of temperature-dependent mechanical property data on ultra-high performance concrete (UHPC). To address this knowledge gap, this paper presents results from an experimental study on the effect of temperature on mechanical properties of UHPC.Specimens made of two UHPC mixes: one with only steel fibers (UHPC-S) and the other with hybrid fibers, that is, both steel and polypropylene (UHPC-H), were tested under different heating conditions in 20 to 750 C temperature range. Compressive strength, tensile strength, stress-strain response, and elastic modulus of UHPC were evaluated at various temperatures. Results generated from these property tests on UHPC were compared with property relations specified in design codes for conventional normal strength concrete (NSC) and high strength concrete (HSC). The comparisons show that UHPC experiences faster degradation in compressive strength and elastic modulus as compared to conventional concrete. However, UHPC exhibits slower degradation in tensile strength and ductility at elevated temperatures due to the presence of steel fibers. Data generated from these property tests were utilized to propose relations for expressing the mechanical properties of UHPC as a function of temperature and these relations can be used as input to numerical models for evaluating fire resistance of structures made of UHPC.

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Effect of Fibers on High-Temperature Mechanical Behavior and Microstructure of Reactive Powder Concrete

Cited by 61 publications

References 53 publications

Influence of Cooling Methods on the Behavior of Reactive Powder Concrete Exposed to Fire Flame Effect

Influence of Cooling Methods on the Behavior of Reactive Powder Concrete Exposed to Fire Flame Effect

Mechanical and Thermal Properties of UHPC Exposed to High-Temperature Thermal Cycling

Effect of temperature on mechanical properties of ultra‐high performance concrete

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