Influence of Industrial Metakaolin Waste on Autoclaved Fiber Cement Properties Changes in Standard Fire Environment

Veliseicik, Tomas; Žurauskienė, Ramunė; Kligys, Modestas; Dauksevic, Mark

doi:10.3390/ma15103455

Cited by 2 publications

(4 citation statements)

References 30 publications

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“…Microstructure research results showed that CF densities incorporate into the microstructure ( Figure 8 ); however, on their surface the formed hydrate amount is not that high when compared with MCF. During the AFK fire effect, complex changes take place such as removing water and creating extra stress; the CF surface starts to oxidize at a temperature higher than 600 °C [ 41 ]; and dehydration of the main hydrate (CSH) takes place [ 2 ]. Such complex effect determines that the contact between CF and cement matrix decreases.…”

Section: Discussionmentioning

confidence: 99%

“…Continuing earlier experiments [ 2 ] as a base, the same raw materials and their combination were used, which makes it closer to composition, used in the facade fiber cement tile production (mixture marking E). CF was added to the mixtures partially, replacing thermally less-resistant MCF to improve the behavior of AFC samples in a high temperature and their properties after a high temperature effect.…”

Section: Methodsmentioning

confidence: 99%

“…Previously carried out scientific research has shown how important it is to try and achieve the best mechanical properties of autoclaved fiber cement (AFC) in a fire effect temperature [ 1 , 2 ]. Cellulose fibers are usually used in AFC compositions.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Short Carbon Fibers on the Properties of Autoclaved Fiber Cement in Standard Fire Environment

et al. 2023

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In case of a fire, the flame can spread from the building through the outer openings to the outside. In such cases, the fire temperature thermal effect determines the façade fibrocement tile thermal destruction, while the flammable thermo-insulating systems used for building energy effectiveness ensures it sets on fire. The spread of such a fire becomes uncontrollable and raises an immediate danger to the people inside the building, while such event dynamics delay and make it harder to put out the fire. Extra additive usage in façade fibrocement tiles can raise its resistance to fire temperature effect. Carbon fiber is widely known as a material resistant to the high temperature destructive effect. An investigation was conducted on the influence that carbon fiber has on the properties of autoclaved fiber cement samples. The autoclaved fiber cement samples were made from the raw materials, typical for façade fiber cement plates, produced in an industrial way (using the same proportions). In the samples, carbon fiber was used instead of mix cellulose fiber in 0.5%, 0.75%, 1% proportions. After completing the density research, it was determined that the carbon fiber effect had no general effect on the sample density. Ultrasound speed spreading research showed that the carbon fiber insignificantly makes sample structure denser; however, after the fire temperature effect, sample structure is less dense when using carbon fiber. The results of both these investigations could be within the margin of error. Insignificant sample structure density rise was confirmed with water absorption research, which during the 1% carbon fiber usage case was lower by 4.3%. It was found that up to 1% carbon fiber usage instead of mix cellulose fiber creates a dense structure of autoclaved fiber cement samples, and the carbon fiber in the microstructure influences the mechanical properties of the autoclaved fiber cement samples. After using carbon fiber in ambient temperature, the sample compressive strength and bending strength increased. However, the results of mechanical properties were completely different after experiencing fire temperature effect. Scanning electron microscopy research showed that the bond between the carbon fiber and the cement matrix was not resistant to high temperature effect, due to which the structure of the samples with carbon fiber weakened. Research showed that carbon fiber lowers the mechanical properties of the autoclaved fiber cement samples after high temperature effect. After analyzing the density, ultrasound speed spreading, water absorption, microstructure and macrostructure, compressive strength, and bending strength, the authors determined the main CF usage for AFK dependencies: 1. CF usage up to 1% replacing MCF makes the AFK structure more dense up to 1.5%, and lowers the water absorption up to 4.3%; 2. CF incorporates itself densely into the AFC microstructure; 3. CF usage up to replacing MCF improves the AFK strength properties up to until the fire temperature effect. Compression strength increases up 7.3% while bending strength increases up to 14.9%. 4. AFK hydrate amount on CF surface is lower than on MCF; 5. Fire temperature effect on AFK with CF causes dehydration by removing water vapor from the microstructure, resulting in a lot of microcracks due to stress; 6. The CF and cement matrix contact zone is not resistant to fire temperature effect. SEM experiments were used to determine the CF “self-removing” effect; 7. Due to complex changes happening in the AFK during fire temperature effect, CF usage does not improve strength properties in the microstructure. Compression strength decreases to 66.7% while bending strength decreases to 20% when compared with E samples.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Influence of Short Carbon Fibers on the Properties of Autoclaved Fiber Cement in Standard Fire Environment

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“…Three scientific articles in the dissertation topic were printed in reviewed scientific journals that have a citation rate in the Clarivate Analytics Web of Science database (Veliseicik et al, 2020;Veliseicik et al, 2022;Veliseicik et al, 2023).…”

Section: Approval Of the Research Findingsmentioning

confidence: 99%

Autoklavinio fibrocemento kompozito kūrimas ir jo savybių tyrimai standartinio gaisro temperatūros aplinkoje

Veliseičik

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Mokslinis vadovasdoc. dr. Ramunė ŽURAUSKIENĖ (Vilniaus Gedimino technikos universitetas, Medžiagų inžinerija -T 008). Konsultantasdr. Modestas KLIGYS (Vilniaus Gedimino technikos universitetas, Medžiagų inžinerija -T 008). Vilniaus Gedimino technikos universiteto Medžiagų inžinerijos mokslo krypties disertacijos gynimo taryba: Pirmininkas dr. Ina PUNDIENĖ (Vilniaus Gedimino technikos universitetas, Medžiagų inžinerija -T 008). Nariai: dr. Giedrius BALČIŪNAS (Vilniaus Gedimino technikos universitetas, Medžiagų inžinerija -T 008), habil. dr. Jacek KATZER (Varmijos ir Mozūrijos universitetas Olštyne, Lenkija, Statybos inžinerija -T 002), prof. dr. Džigita NAGROCKIENĖ (Vilniaus Gedimino technikos universitetas, Medžiagų inžinerija -T 008), prof. dr. Danutė VAIČIUKYNIENĖ (Kauno technologijos universitetas, Statybos inžinerija -T 002). Disertacija bus ginama viešame Medžiagų inžinerijos mokslo krypties disertacijos gynimo tarybos posėdyje 2024 m. birželio 13 d. 10 val. Vilniaus Gedimino technikos universiteto SRA-I posėdžių salėje.

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Influence of Industrial Metakaolin Waste on Autoclaved Fiber Cement Properties Changes in Standard Fire Environment

Cited by 2 publications

References 30 publications

Influence of Short Carbon Fibers on the Properties of Autoclaved Fiber Cement in Standard Fire Environment

Influence of Short Carbon Fibers on the Properties of Autoclaved Fiber Cement in Standard Fire Environment

Autoklavinio fibrocemento kompozito kūrimas ir jo savybių tyrimai standartinio gaisro temperatūros aplinkoje

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