(1) For stressed and unstressed tests, compressive strength of HSC vary differently and more unfavorably
with temperature than that of NSC. The differences are more pronounced in the temperature range between
25 °C to about 400 °C, where HSC sustains markedly higher strength loss than NSC. Differences become
less significant at temperatures above 400 °C. The variations of compressive strength with temperature
may be characterized by an initial stage of strength loss (25 °C to approximately 100 °C), followed by a
stage of stabilized strength and recovery (100 °C to approximately 400 °C), and a stage above 400 °C
characterized by a monotonic decrease in strength with increasing temperature. The strength recovery stage
of HSC occurs at higher temperatures than NSC.
(2) There is a serious lack of fire test data for LWA HSC under all three test conditions and for NWA HSC
under the stressed test condition.