Mechanical Properties of Metakaolin-based Concrete Exposed to Elevated temperature

Document Type : Original research paper

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Giza Engineering Institute

Abstract

As buildings are often exposed to high temperatures due to fire, understanding the thermal resilience of construction materials is critical. This research highlights the need for further exploration of building materials that can withstand extreme temperatures to ensure structural integrity and safety. Four concrete mixes were produced with locally available materials of ordinary Portland cement (OPC), metakaolin (MK), crushed fire brick as fine arggregate, and crushed dolomite as coarse aggregate. These concrete mixes were tested for physical and mechanical properties at room temperature and after exposure to elevated temperature of 250 °C, 500°C, 750 °C, 1000 °C, 1250 °C and 1500 °C.The results demonstrate that compressive strength generally increases with temperature up to 1000 °C, with the K20 mix (20% MK) exhibiting the highest strength at this temperature. These findings indicate that metakaolin incorporation significantly enhances concrete's thermal performance, suggesting that K20 is a promising candidate for fire-resistant construction applications.

Keywords

Journal of Engineering Advances and Technologies for Sustainable Applications
Volume 1, Issue 4
October 2025
Pages 14-20

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