Print ISSN: 1681-6900

Online ISSN: 2412-0758

Author : Abed Al-wahab Ali, Manolia

Residual Mechanical Properties of Self-Compacting Concrete Exposed to Elevated Temperatures

Manolia Abed Al-wahab Ali

Engineering and Technology Journal, 2011, Volume 29, Issue 7, Pages 1386-1390

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.