Manolia Abed Al-wahab Ali
Abstract
This study aims to investigate the residual mechanical properties (compressive strength, modulus of rupture and dynamic modulus of elasticity) of selfcompacting concrete (SCC) exposed ...
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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.
