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

Abstract

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%.

High Temperature Performance of Self-Compacting Concrete Containing Boron Active Belite Cement

“…Aygörmez et all. [51] and Öz et all. [55] showed that increasing the temperature have an important effect on the UPV values of concrete which affects unfavorably.…”

“…Aygörmez et all. [51] showed that the conversion from Ca(OH) 2 to CO begins around 400°C and the C-S-H structures is quickly destroyed as it approaches 600°C. Tang et all.…”

“…The biggest weight loss occurred between 400°C and 600°C. The most important point of this mechanism is due to the evaporation of free water and condensed hydroxyl groups [19,51,56].…”

Comportamiento Térmico y Estructural del Concreto Expuesto a Altas Temperaturas: Una Revisión de la Literatura

“…A mayor resistencia de diseño del concreto aumenta la conductividad térmica y densidad, lo que permite una transferencia de calor más fácil, lo cual afecta el comportamiento estructural y por ende la resistencia residual se reduce considerablemente (Ryu et al, 2020) La resistencia a flexión más alta para concretos de fibra infiltrado con lechada a base de cemento blanco con metacaolín y aditivo de cenizas volantes a 300°C fue de 55.51MPa, mientras que para los 400°C y 600°C fueron de 49.48MPa y 36.21MPa respectivamente (Aygörmez et al, 2019).…”

“…El aditivo de cenizas volantes aumenta la resistencia a flexión para concretos con fibra infiltrada con lechada a base de cemento blanco con metacaolín a 300°C y esta fue de 55.51MPa, mientras que para los 400°C y 600°C fueron de 49.48MPa y 36.21MPa respectivamente (Aygörmez et al, 2019 (Ngoc, et al, 2018).…”