Basalt powder dependent properties of mortars subjected to high temperatures

Abstract

The effects of high temperatures of up to 800 degrees C on residual physical and mechanical properties of mortars are presented in this paper. Due to its resistance to high temperatures, basalt powder is used as a substitute to standard sand at the ratios of 20% and 40%. Polypropylene or basalt fibres have been added to mortar mixtures to avoid spalling. Results show that the ratio of basalt powder does not change the strength reduction rate, and that the flexural strength performance of mortar mainly depends on fibre type and temperature rather than on basalt powder substitution.