Cyclic Temperature Loading Residual Flexural Strenght of Refractory Slabs

Holčapek, Ondřej; Reiterman, Pavel; Konvalinka, Petr

doi:10.14311/ap.2017.57.0097

Cited by 2 publications

(2 citation statements)

References 22 publications

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“…It must be noted that FGCP had already gone through exposure to elevated temperature during brick production, which could be successfully exploited in the composition formulation of refractory castables. is approach was con rmed in previous research [16,34]. In addition, Table 1 shows the chemical composition of the studied FGCP, when the total amount of Al 2 O 3 is 13.98% and SiO 2 is 64.45%.…”

Section: Fine Ceramic Powdersupporting

confidence: 72%

Development of Composite for Thermal Barriers Reinforced by Ceramic Fibers

Holčapek

Koťátková

Reiterman

2018

Advances in Civil Engineering

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e paper introduces the development process of fiber-reinforced composite with increased resistance to elevated temperatures, which could be additionally increased by the hydrothermal curing. However, production of these composites is extremely energy intensive, and that is why the process of the design reflects environmental aspects by incorporation of waste material-fine ceramic powder applied as cement replacement. Studied composite materials consisted of the basalt aggregate, ceramic fibers applied up to 8% by volume, calcium-aluminous cement (CAC), ceramic powder up to 25% by mass (by 5%) as cement replacement, plasticizer, and water. All studied mixtures were subjected to thermal loading on three thermal levels: 105°C, 600°C, and 1000°C. Experimental assessment was performed in terms of both initial and residual material properties; flow test of fresh mixtures, bulk density, compressive strength, flexural strength, fracture energy, and dynamic modulus of elasticity were investigated to find out an optimal dosage of ceramic fibers. Resulting set of composites containing 4% of ceramic fibers with various modifications by ceramic powder was cured under specific hydrothermal condition and again subjected to elevated temperatures. One of the most valuable benefits of additional hydrothermal curing of the composites lies in the higher residual mechanical properties, what allows successful utilization of cured composite as a thermal barrier in civil engineering. Mixtures containing ceramic powder as cement substitute exhibited after hydrothermal curing increase of residual flexural strength about 35%; on the other hand, pure mixture exhibited increase up to 10% even higher absolute values.

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Section: Fine Ceramic Powdersupporting

confidence: 72%

Development of Composite for Thermal Barriers Reinforced by Ceramic Fibers

Holčapek

Koťátková

Reiterman

2018

Advances in Civil Engineering

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“…Currently, its importance is rising due to the high amount of construction and demolition waste (C&D). The character of the ceramics offers a number of suitable applications in the field of solidification of heavy metals [20] or composites that are resistant to high temperatures [21,22]. However, its application as partial cement replacement lies is of primary scientific interest [23,24,25].…”

Section: Introductionmentioning

confidence: 99%

Estimation of Hydration Degree of Blended Cements with the Help of k-Values

et al. 2019

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The growing utilization of various mineral additives in the building industry has caused concern worldwide to reduce the emissions of carbon dioxide from Portland cement (OPC) production. The present paper is focused on the determination of the degree of hydration of blended binding systems based on Portland cement. Blast furnace slag, fly ash, and ceramic powder are used in the study; they are applied by 12.5 wt.% up to 50% of OPC replacement. The evolution of the hydration process is monitored using thermogravimetry in selected time intervals to determine the degree of hydration; its ultimate value is obtained from numerical estimation using the Michaelis-Menten equation. However, due to the application of active mineral additives, the correction in terms of equivalent binder is conducted. Corrected values of the degree of hydration exhibit good fit with compressive strength.

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Cyclic Temperature Loading Residual Flexural Strenght of Refractory Slabs

Cited by 2 publications

References 22 publications

Development of Composite for Thermal Barriers Reinforced by Ceramic Fibers

Development of Composite for Thermal Barriers Reinforced by Ceramic Fibers

Estimation of Hydration Degree of Blended Cements with the Help of k-Values

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