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Residual properties of alkali-activated slag concrete exposed to elevated temperatures

Virendra Kumar (Civil Engineering, National Institute of Technology Jamshedpur, Jamshedpur, India)
Rajesh Kumar Paswan (Civil Engineering, National Institute of Technology Jamshedpur, Jamshedpur, India)

Journal of Structural Fire Engineering

ISSN: 2040-2317

Article publication date: 14 February 2022

Issue publication date: 15 February 2023




This paper attempted to study the alkali-activated (AA) binder consisting of 94% of ground granulated blast furnace slag (GGBFS) and 6% of blended powder of alkali metal hydroxide and metal sulfate, which acted as an activator.


Several concrete specimens (cubes, cylinders and prisms), which were casted using AA binders, were further tested for mechanical properties after exposure to elevated temperatures of 200 °C, 400 °C, 600 °C and 800 °C. Additionally, to understand the structural behavior in uniaxial compressive load, reinforced concrete short columns were cast, cured and tested at ambient temperature as well as after exposure to 300 °C, 600 °C and 900 °C, to know the residual strength after exposure to elevated temperature.


The findings for the residual strength of alkali-activated slag binder concrete (AASBC) indicated a substantial agreement with the results obtained for the residual strength of Portland slag cement (PSC) concrete, thereby showing the effectiveness of binder when used as a replacement of cement.


The study clearly indicates that the binder developed is an effective approach for the 100% replacement of cement in the concrete.



This work has been funded by the Research and Development division, Tata Steel Ltd., Jamshedpur, with the supply of Ground Granulated Blast Furnace Slag (GGBFS). The authors thank the Department of Civil Engineering, National Institute of Technology, Jamshedpur, for providing the research facilities. The authors would also like to thank N. Ramkumar, Ph.D., Director, Navoday Sciences Pvt. Ltd., Chennai, for supplying the activator along with the technical input. Further, the authors would like to thank Mr. Saurav Kumar Saikia for the editing of the paper into a standard manuscript form.

Statement on informed consent in studies with human and animal subjects: There were no human and animal subjects in this article, and informed consent was not applicable.

Statement on consent to publication: All the authors have given their consent to publish this research manuscript in the Journal of Structural Fire Engineering.

Statement on conflict of interest: The authors declared that there was no conflict of interest.


Kumar, V. and Paswan, R.K. (2023), "Residual properties of alkali-activated slag concrete exposed to elevated temperatures", Journal of Structural Fire Engineering, Vol. 14 No. 1, pp. 1-14.



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