This study aims to investigate the residual mechanical properties (compressive
strength, modulus of rupture and dynamic modulus of elasticity) of selfcompacting
concrete (SCC) exposed to elevated temperatures ranging from (100-
800 oC) as well as studying its fresh and hardened properties at normal
temperature. Also it aims to study the influence of high reactivity metakaoline
(HRM), as a partial replacement by weight of cement, for improving its mechanical
properties after and before exposure to elevated temperatures.
The concrete specimens were subjected to a temperature range of (100,
200, 400, 600 and 800oC) with an exposure duration of 2-houres. The test results
showed that the performance of SCC containing HRM is higher than that of SCC
without HRM , where the residual compressive strength of HRM SCC after an
exposure to a temperature level of (800oC) was 73.2% while for the normal SCC
was 65% from their original strength .At the same exposure temperature (800oC) ,
the loss in modulus of rupture is higher than that of compressive strength , the
difference was between (2% - 12.4%). Also the reduction in dynamic modulus of
elasticity (Ed) is higher than that of compressive strength and modulus of rupture
,where the residual (Ed) was between (47.3% - 63.5%) after 800oC exposure.