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Effect of high temperatures on self-compacting concrete with high levels of sugarcane bagasse ash and metakaolin
Graphical abstract Display Omitted
Highlights SCC with high cement replacement by SCBA and MK are analyzed at high temperatures. The greater incorporation of SCBA and MK maintained the ideal level of workability. The use of SCBA and MK reduces the deterioration of concrete at high temperatures. The cement replacement kept the residual compressive strength and the index void.
Abstract Using mineral additives, such as sugarcane bagasse ash (SCBA) and metakaolin, are solutions to produce self-compacting concrete (SCC) with low cement content, having lower impacts on the environment. SCC with low cement content and high sugarcane bagasse ash and metakaolin contents provides a different microstructure and porosity regarding SCC without these additives, therefore when submitted to high temperatures they may present a different behaviour. Therefore, this study aims to evaluate the behaviour of SCC at high temperatures replacing cement by sugarcane bagasse ash and metakaolin at contents of 30% to 50%. For this purpose, five SCC compositions were assessed for self-compactness by slump-flow, J-ring, L-box and V-funnel tests, as well as visual stability index. After curing at room temperature, the SCC were subjected to exposure at temperatures of 200 °C, 400 °C, 600 °C and 800 °C, and then analysed by visual and tactile inspection, mass loss, compressive strength, ultrasonic pulse velocity, absorption by capillarity and immersion, void index and X-ray diffraction. Results showed that SCC with up to 40% of sugarcane bagasse ash and metakaolin is less sensitive to high temperatures presenting less cracking and lower strength losses compared to room temperature.
Effect of high temperatures on self-compacting concrete with high levels of sugarcane bagasse ash and metakaolin
Graphical abstract Display Omitted
Highlights SCC with high cement replacement by SCBA and MK are analyzed at high temperatures. The greater incorporation of SCBA and MK maintained the ideal level of workability. The use of SCBA and MK reduces the deterioration of concrete at high temperatures. The cement replacement kept the residual compressive strength and the index void.
Abstract Using mineral additives, such as sugarcane bagasse ash (SCBA) and metakaolin, are solutions to produce self-compacting concrete (SCC) with low cement content, having lower impacts on the environment. SCC with low cement content and high sugarcane bagasse ash and metakaolin contents provides a different microstructure and porosity regarding SCC without these additives, therefore when submitted to high temperatures they may present a different behaviour. Therefore, this study aims to evaluate the behaviour of SCC at high temperatures replacing cement by sugarcane bagasse ash and metakaolin at contents of 30% to 50%. For this purpose, five SCC compositions were assessed for self-compactness by slump-flow, J-ring, L-box and V-funnel tests, as well as visual stability index. After curing at room temperature, the SCC were subjected to exposure at temperatures of 200 °C, 400 °C, 600 °C and 800 °C, and then analysed by visual and tactile inspection, mass loss, compressive strength, ultrasonic pulse velocity, absorption by capillarity and immersion, void index and X-ray diffraction. Results showed that SCC with up to 40% of sugarcane bagasse ash and metakaolin is less sensitive to high temperatures presenting less cracking and lower strength losses compared to room temperature.
Effect of high temperatures on self-compacting concrete with high levels of sugarcane bagasse ash and metakaolin
de A. Mello, Larissa C. (author) / S. dos Anjos, Marcos A. (author) / V. A. de Sá, Maria V. (author) / S. L. de Souza, Nathaly (author) / de Farias, Evilane C. (author)
2020-03-09
Article (Journal)
Electronic Resource
English
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