Effect of high temperature on the performance of self-compacting mortars produced with calcined kaolin and metakaolin

Arslan, Furkan; Benli, Ahmet; Karataş, Mehmet

doi:10.1016/j.conbuildmat.2020.119497

Cited by 52 publications

(7 citation statements)

References 48 publications

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“…Metakaolin is a cementitious material with very high pozzolanic reactivity and has several applications, particularly in the construction industry, which is among its largest users. The main advantage of metakaolin is its capability of improving the mechanical properties and durability of concrete when used as a partial replacement of cement [5]. The reactivity of metakaolin depends on several factors.…”

Section: Introductionmentioning

confidence: 99%

Thermal Activation of Kaolin: Effect of Kaolin Mineralogy on the Activation Process

Kosmidi

Panagiotopoulou

Angelopoulos

et al. 2021

International Conference on Raw Materials and Circular Economy

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Kaolin is an industrial mineral used in a wide variety of applications due to its crystalline structure, mineral and elemental composition. After kaolin undergoes heat treatment in a specific temperature range, metakaolin, which exhibits a strong pozzolanic reaction, is formed. This paper examines the effects of different kaolin qualities on the thermal activation process of metakaolin production. The qualities of kaolin depend on the impurities they contain, such as mica, feldspar and quartz. In this study, four different samples of kaolin are investigated. Each sample was heat treated in a lab-scale rotary kiln in order to study the chemical, structural and morphological changes that occurred and their influence on pozzolanic activity. The parameters being considered in the experimental process were the temperature and the duration of the treatment. Thus, the calcination process for each of the four kaolin types was carried out at 600, 650 and 700 °C for 3 h. The occurred changes were monitored using XRD, FTIR and DTA analysis. Additionally, the reactivity of all thermally treated samples was evaluated based on the Chapelle test. The results showed that the fewer the impurities, the easier the transformation of the material to metakaolin. The optimum result was the metakaolin, which originated from the purest quality of kaolin and was comparable to the commercial product. Finally, the pozzolanic activity of the thermally activated samples also depended on the purity of the kaolin.

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Section: Introductionmentioning

confidence: 99%

Thermal Activation of Kaolin: Effect of Kaolin Mineralogy on the Activation Process

Kosmidi

Panagiotopoulou

Angelopoulos

et al. 2021

International Conference on Raw Materials and Circular Economy

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“…Since metakaolin contains high levels of SiO2 and Al2O3, it reacts with Ca(OH)2 formed as a result of cement hydration, forming new calcium silicate hydrate (C-S-H) structures and alumina-containing phases (C4AH13, C2ASH8, C3AH6). With the formation of these products, increases in mechanical and durability properties occur in concrete and mortars (Arslan, Benli, & Karatas, 2020). In addition to contributing to the formation of C-S-H using fly ash also reduces the cost and permeability.…”

Section: Introductionmentioning

confidence: 99%

High-temperature effects on white cement-based slurry infiltrated fiber concrete with metakaolin and fly ash additive

Aygörmez

Al-mashhadani

Canpolat

2020

rdlc

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In this study, the high flexural parameter properties of Slurry Infiltrated Fiber Concrete (SIFCON) were examined, as was the use of metakaolin and fly ash with PC CEM I 52.5 R (White Cement). 5 series were prepared and metakaolin and fly ash replaced PC CEM I 52.5 R at 25% and 50%. In this study, while researching White Cement in the production of SIFCON samples, metakaolin which is easy to obtain in kaolin-rich soils, and fly ash, which is a waste material, were also evaluated to reduce CO2 emission in cement production. 5% of steel fiber was used in all series and the results of 7 and 28 days flexural and compressive strengths and ultrasonic pulse velocity (UPV) were examined. Given the 28-day test period, a strength increase was observed in metakaolin-added samples, while lower results were obtained in fly ash-added samples since fly ash was not yet completely hydrated. After the 200, 400, and 600 °C high-temperature tests, the results of flexural and compressive strengths, UPV, and weight loss were examined. The increase in strength after 300°C can be caused by drying shrinkage of the matrix, whose C-S-H structure is not yet intact, and compression of the fiber wall. The conversion from Ca(OH)2 to CaO begins at about 400°C, and the C-S-H structure is quickly destroyed as it approaches 600°C. SIFCON samples have the highest mechanical and durability properties by replacing the metakaolin with White Cement by 25%. The lowest results were obtained by replacing the fly ash with White Cement by 50%.

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“…SCC is considered one of the most appropriate structural materials, because it can flow under its weight without any bleeding or segregation (Ali et al, 2019;Nuruddin et al, 2014). The watercement (w/c) ratio, binder-filler ratio, aggregate size and dosages of super-plasticizers (SPs) and viscositymodifying agents (VMAs) all have significant impacts on the flow ability and segregation resistance of SCC (Arslan et al, 2020;Pathak and Siddique, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…The findings stated by Li et al (2012) do not match with other research findings. Researchers (Ali, 2012;Arslan et al, 2020;Nuruddin et al, 2014) examined the thermal performance of highstrength concrete at high temperatures in the range 0-1000 o C and stated that carbonate-based aggregates have a better performance than HSC under elevated temperatures, concluding that aggregate type had a direct influence on the fire performance of HSC.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Microstructure Characteristics of Self-compacting Concrete with Different Admixtures Exposed to Elevated Temperatures

Kanagaraj¹

2023

JJCE

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Self-compacting concrete (SCC) is a high-performance concrete widely used as a building material. The present investigation examines the effects of age and cooling type (air-cooled and water-cooled) of SCC after being exposed to elevated temperatures and compares them to those of normal conventional concrete (NCC). Two types of concrete; i.e., NCC and SCC, were developed and studied for early-age and residual strengths. SCC was developed with three different types of admixtures; namely, fly ash (FA), silica fume (SF) and metakaolin (MK) as binder materials, by replacing the cement. The mechanical characteristics of FA- and SF-blended SCC before heating show similar results, whereas MK-based SCC possesses greater strength than other mixes. In the case of specimens exposed to high temperature of 1000℃, MK-blended SCC produced the lowest residual strength compared to FA- and SF-based mixes. Further microstructural investigation was conducted to examine the internal structure of the specimens exposed to various heating temperatures. From the results, it is concluded that the higher the strength gain upon aging, the greater the strength loss upon temperature rise. KEYWORDS: Self-compacting concrete, Fly ash, Silica fume, Metakaolin, Residual strength, Microstructure.

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Effect of high temperature on the performance of self-compacting mortars produced with calcined kaolin and metakaolin

Cited by 52 publications

References 48 publications

Thermal Activation of Kaolin: Effect of Kaolin Mineralogy on the Activation Process

Thermal Activation of Kaolin: Effect of Kaolin Mineralogy on the Activation Process

High-temperature effects on white cement-based slurry infiltrated fiber concrete with metakaolin and fly ash additive

Mechanical Properties and Microstructure Characteristics of Self-compacting Concrete with Different Admixtures Exposed to Elevated Temperatures

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