Concrete with SCM may show better performance at elevated temperatures.
This has been neatly explained in the following articles.
Article An investigation of high-volume fly ash concrete blended wit...
Article Effect of High Temperature on High-Volume Fly Ash Concrete
Effect of SCMs such as fly ash and Silica fume gives positive impact on strength as well as durability properties of concrete even at elevated temperature.
As temperature increases up to 100 C, there is no any loss in strength, but at 300-400C concrete get started loosening strength due to cracking and up to 800C it losses all its strength. But loss in SCMs concrete is less than conventional concrete, so we can say that concrete containing fly ash and silica fume is better than OPC concrete.
For more details please go through the article
Article Prediction of rapid chloride permeability of self-compacting...
Thank you Dr. Shashikant Kumar Dear Thank you very much for the excellent description. We are testing the durability characteristics of our mix design concrete incorporating silica fume percentages at elevated temperature; in one of our papers, we found the strength increased up to 300 C after a 400 C reduction of strength was observed. Still, that work was without use in SCM’s. We decided the range of temperature of our project work with Silica fume percentages is 200 C, 400 C, 600 C, 800 C, and 1000 C; what is your advice regarding the range of temperature.
Dear Shashank Gupta Thank you very much for sharing the related articles.
Dear Mohammad Nadeem Akhtar the free water starts evaporating rapidly after 105 C. In the temperature range from 80 to 150 °C, dehydration of ettringite takes place followed by the decomposition of gypsum between 150 and 170 °C. When the temperature reaches to 300 °C, the chemically bound water starts to evaporate, which in turn decreases the compressive strength of concrete. As temperature is further increased, decomposition of portlandite occurs between 400 and 540 °C. When temperature increases beyond 400 °C, the concrete strength decreases more rapidly due to the degradation of calcium–silica–hydrate (C–S–H). Second phase of the C–S–H decomposes in the temperature range from 600 to 800 °C forming β-C2S. At a temperature of 900 °C, the C–S–H breaks down completely. Therefore, the critical temperature for concrete ranges from approximately 400 to 900 °C. In this range concrete loses most of its strength.
The range of temperature elevation is good, if you want more accurate results then you can go through smaller range like 100, 200, 300 C and so on.
Dear Mohammad Nadeem Akhtar thanks for posting this interesting technical question. Some useful information about this topic can already be retrieved right here on RG. For example, please have a look at the following link:
The impact of metakaolin, silica fume and fly ash on the temperature resistance of high strength cement paste
Article The impact of metakaolin, silica fume and fly ash on the tem...
This article has been posted by the authors as public full text on RG so that it can be freely downloaded as pdf file.
Also please see the following potentially relevant article:
Effect of fly-ash and silica fume on the properties of concrete exposed to high temperature
Article Effect of fly-ash and silica fume on the properties of concr...
Unfortunately this paper is not available as public full text on RG. However, the author has an RG profile (https://www.researchgate.net/profile/Mahmoud-Taher). Thus there is a good chance that you can request the public full text directly from him.
Good luck with your work and best wishes, Frank edelmann
Dear Dr. Shashikant Kumar Thank you very much for a clear explanation
Dear Dr. Frank T. Edelmann Thank you very much for sharing all the related information
Hi Dr Mohammad Nadeem Akhtar .
I hope the following link could help: https://www.sciencedirect.com/topics/engineering/supplementary-cementitious-material
Dear Dr. Aref Wazwaz Thank you very much for sharing the link
I would like to suggest the following articles related with this topic:
https://www.mdpi.com/2075-5309/12/1/44/pdf
Article Effect of fly-ash and silica fume on the properties of concr...
Article An investigation of high-volume fly ash concrete blended wit...
https://www.sciencedirect.com/science/article/abs/pii/S0950061821036205
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