Effect of elevated temperature on the calcined clay-limestone and marble stone blended cement concrete

ABSTRACT

The impact of high temperatures on calcined clay-limestone cement concrete (LC³) and calcined clay-marble stone cement concrete (MC³) is studied in this paper. In the present study, M25 and M35 grades of concrete was prepared using LC³ and MC³ cement and ordinary Portland cement (OPC). After 28 days of moist curing, prepared cubes of size 100 × 100 × 100 mm³, which were subjected to 100°C, 200°C, 400°C, 600°C and 800°C temperatures. Scanning electron microscopy (SEM), mass loss, surface texture and compressive strength (CS) were studied before and after specified temperatures. The X-ray diffraction (XRD) patterns, thermogravimetric analysis (TGA) and Fourier transformed infrared (FTIR) spectroscopy have been studied over M25-OPC, M25-LC³ and M25-MC³ concrete. The result shows that when the temperature exceeds 400°C, the mass loss in OPC was more than LC³ and MC³ concrete. CS was more in LC³ and MC³ concrete than OPC concrete at all high temperatures. The SEM results reveal that M25-LC³ and M25-MC³ concrete specimens have a sound structured C–S–H gel at high temperatures as compared to M25-OPC concrete specimens.

KEYWORDS:

• Elevated temperature
• marble stone concrete
• limestone concrete
• Calcined clay
• concrete strength

Acknowledgments

The authors express their gratitude to the Testing of Material Laboratory (TOM), Structural Engineering Department, SRES SCOE Kopargaon, for providing important instrumental facilities for the study.

Disclosure statement

No potential conflict of interest was reported by the author(s).