Mechanical and Basic Physical Properties of High-Strength Concrete Exposed to Elevated Temperatures

Abstract:

In this paper, the effect of elevated temperatures on the mechanical and basic properties of two different newly-designed high-strength concretes is studied. The studied materials were prepared from Portland cement, steel fibers, reactive finely milled quartz powder and quartz sand, silica fume, plasticizer, and with a relatively low water/cement ratio of 0.24. The samples were stored in water environment for the first 28 days of hydration to achieve better mechanical properties. Then, after pre-drying at 105 °C to constant mass, the materials were exposed to elevated temperatures of 600 °C and 1000 °C where they were kept for 2 hours. The basic physical properties, such as matrix density, bulk density and open porosity were determined as a function of temperature. Mechanical properties (compressive and flexural strength) were also studied. The measured parameters exhibited a high dependence on temperature and the obtained results pointed to the structural changes of the studied materials. Spalling was not observed because of the pre-drying treatment.

• Periodical: Key Engineering Materials (Volume 760)
• Pages: 108-113
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.760.108
• Online since: January 2018
• Authors: Lenka Scheinherrová*, Monika Čáchová, Michaela Petříková, Lukáš Fiala, Eva Vejmelková, Stefania Grzeszczyk, Robert Černý
• Keywords: Basic Physical Properties, Elevated Temperatures, High-Strength Concrete, Mechanical Properties

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