Copyright © 2026 Authors retain the copyright of this article. This article is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

@article{203837,
        author = {KARUMANCHI MEERAVALI and NAGALARAPU PRASHANTH and AKULA GOVARDHAN and CH RAM LOKESH REDY and DASARI DURGA PRASAD and MANDURI VARUN and Ch Malleswara rao and Regulagunta Madhu},
        title = {Comparative Study on the Behavior of Standard and High-Strength Concrete under Elevated Temperatures},
        journal = {International Journal of Innovative Research in Technology},
        year = {2026},
        volume = {13},
        number = {1},
        pages = {1645-1654},
        issn = {2349-6002},
        url = {https://ijirt.org/article?manuscript=203837},
        abstract = {This study investigates the effect of elevated temperatures on the mechanical and physical behavior of Standard Concrete (M30) and High-Strength Concrete (M60), with a focus on evaluating their performance under thermal exposure ranging from ambient conditions up to 800°C. Concrete specimens were cast, cured, and subjected to systematic heating, followed by testing for workability (slump), compressive strength, split tensile strength, flexural strength, and modulus of elasticity. The M30 mix was prepared with a water-cement ratio of 0.45, while the M60 mix used a lower water-cement ratio of 0.35, enhanced with a 0.8% polycarboxylate-based superplasticizer to maintain workability. Test results revealed that both concrete types showed a marginal gain in strength at 200°C due to internal drying and matrix densification. However, significant deterioration in mechanical properties was observed beyond 400°C. At 800°C, M30 and M60 retained only 47% and 42% of their original compressive strength, respectively, with similar reductions in tensile, flexural, and elastic properties. While M60 concrete consistently exhibited superior strength at all temperature levels, its rate of deterioration was more severe, highlighting its greater sensitivity to thermal damage due to a denser microstructure and reduced pore escape pathways. The modulus of elasticity showed the highest reduction, confirming significant loss in stiffness and structural integrity.},
        keywords = {Ordinary Portland cement (OPC); Normal concrete; High-strength concrete; Elevated temperatures; Mechanical properties.},
        month = {June},
        }