Study of Fly Ash Concrete Exposed to Elevated Temperature

Sabri, Muhamad Zameel Hakim Ahmed; Malek, Rohaya Abdul; Omar, Abdullahi Ali; Nizar, Ismail Khairul

doi:10.4028/p-13p036

Cited by 5 publications

(2 citation statements)

References 7 publications

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“…Sabri et al [5] investigated the impact of fly ash on hardened concrete that had spent two hours at 400 °C. The high amount of fly ash could enhance the qualities of concrete exposed to this moderately high temperature, according to both the mechanical and microstructural results.…”

Section: Introductionmentioning

confidence: 99%

Effect of unconventional supplementary cementitious materials on the hardened cement pastes exposed to high temperature

Fehérvári

2023

J Therm Anal Calorim

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An investigation was conducted to determine how Ordinary Portland Cement and several unconventional cementitious additives, such as magnetite, chamotte, perlite, boron carbide, and more common powdered quartz, affected the behaviour of hardened cement paste when subjected to high temperatures. The test was conducted using a constant water–fines ratio of 0.3. The water–cement ratios were nevertheless 0.25 and 0.222 as a result of the two fine replacement ratios (20% and 35%, respectively). Seven heat steps were used to heat the specimens of hardened cement paste to 900 °C. On the cooled specimens, comparisons between relative residual compressive strength and residual compressive strength were made. Additionally, a new approach known as "temperature endurance" is used to express the total area under each strength curve. Furthermore, the specimens were analysed using a scanning electron microscope. Our research has shown that perlite, when employed as additional cementitious material, performs remarkably well and has favourable effects, even at high temperatures. Up to 600 °C, it has the longest-lasting, practically constant residual strength values. In this area, the relative strength reductions are less than 15%. Furthermore, it is shown that boron carbide increases compressive strength at 900 °C in comparison to values at 600 °C. Due to the material's low melting point and the formation of secondary bindings at the highest heat step, this effect results. The other materials under investigation, such as powdered quartz, magnetite, and powdered chamotte, perform only slightly better than the reference homogeneous Ordinary Portland Cement, particularly in the mid and high heat ranges. In low heat ranges and by lower addition of fines, particularly in the well-known local strength maximum of 200–300 °C, homogeneous matrixes perform better.

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Section: Introductionmentioning

confidence: 99%

Effect of unconventional supplementary cementitious materials on the hardened cement pastes exposed to high temperature

Fehérvári

2023

J Therm Anal Calorim

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“…Sabri et al [23] investigated the impact of fly ash on hardened concrete that had spent two hours at 400 °C. The high amount of fly ash could enhance the qualities of concrete exposed to this moderately high temperature, according to both the mechanical and microstructural results.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Elevated Temperature on Ordinary Portland Cements

Fehérvári

2022

Period. Polytech. Civil Eng.

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A study was directed to analyze the influence of the different types of Ordinary Portland Cements (OPC) on the hardened cement paste exposed to high temperatures. Hardened cement paste specimens with three types of cement and nine water-cement ratios were investigated and heated to 11 heat steps at 28 days of age. Residual compressive strength and relative residual compressive strength were compared to the unheated results. It was shown that the expected range for the relative residual strength of the different types of OPC up to 400 °C is between 90 and 100%. From the local minimum at 150 °C to the maximum at 300 °C. The CEM I 52.5 type of cement shows the least favorable behavior to the increased (over 400 °C) temperature, according to the results of the residual compressive strengths curves and the newly introduced Integrated Temperature Endurance values after the first water-cement ratio (0.3). Nine water-cement ratios were tested with the favorable types of OPC (CEM I 42.5 and CEM I 32.5). At all water-cement ratios, the residual strength tendencies for the two types of cement were parallel. It has been observed that changes in the water-cement ratio have little to no impact on the relative strength curve's shape or the relationship between strength and the water cement ratio. As a result of our experiments applying simply Ordinary Portland Cement, it is obvious that the CEM I 32.5 type of OPC cement significantly outperformed the CEM I 42.5 type in regards of post-heating strength tendencies.

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Sustainable alternate binding material for concrete using waste materials: A testing and computational study for the strength evaluation

Khan,

Amin

et al. 2023

Journal of Building Engineering

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Study of Fly Ash Concrete Exposed to Elevated Temperature

Cited by 5 publications

References 7 publications

Effect of unconventional supplementary cementitious materials on the hardened cement pastes exposed to high temperature

Effect of unconventional supplementary cementitious materials on the hardened cement pastes exposed to high temperature

The Effect of Elevated Temperature on Ordinary Portland Cements

Sustainable alternate binding material for concrete using waste materials: A testing and computational study for the strength evaluation

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