Abstract
This paper deals with an experimental study on the post-heat performance of cement mortars containing Silica Fume (SF) or Granulated Blast-Furnace Slag (GBFS). To this end, compressive, tensile and bending strength tests were conducted on mortar specimens containing 7, 14 and 21% pozzolanic materials as the replacement for cement. To perform the heating process, the specimens were exposed to temperatures of 25, 100, 250, 500, 700 and 900 °C. Based on the results, in case of low and high exposure temperatures (i.e. up to 250 and 500 °C or greater), GBFS and SF can most effectively improve the mortar's performance. Quantitatively, the compressive, tensile and bending strengths were increased by 73 and 180, 45 and 100, 106 and 112%, respectively, when exposed to low and high temperatures. In addition, as the temperature rises, the particles of specimens containing SF or GBFS shrink less in size compared to the control specimen.
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