الفهرس | Only 14 pages are availabe for public view |
Abstract Concrete has a good reputation for fire resistance as it has a low thermal conductivity and is non-combustible. It finds wide applications in buildings and other built infrastructure, where fire safety is one of the primary considerations. In recent years, self-compacting concrete (SCC) is a new generation of concrete. that can be compacted under its own weight without the need of external vibration. SCC is being widely used in place of normal strength concrete (NSC), due to significant economical, architectural, and structural advantages. SCC can provide as compared to conventional NSC. With the increased use of SCC, concern has developed regarding the behavior of such concrete under fire exposure. Proper understanding of the effects of high temperatures on the properties of SCC is necessary to ensure the safety of buildings during fire. The fire resistance of concrete structural members is governed by thermal and mechanical properties of constituent concrete. The main objective of this investigation was to study the effect of using mineral admixtures; ground blast furnace slag (GBFS) and ground burned clay bricks (GCB), on the fresh and hardened properties of SCC after exposed to elevated temperatures. The present work can be largely divided into two parts. The first part was concerned with studying the effect of using local wastes mineral admixtures on the fresh and hardened properties of SCC at room temperature. Two types of wastes powder, GBFS, GCB and combinations of them were used as a partial replacement of cement content by 30% by weight. Five mixes were investigated through the present experimental program. The first mix was control mix without any mineral admixture. While 30% of cement weight was replaced by GBFS in the second mix. In the third mix, 30% of cement weight was replaced by 20%GBFS+ lO%GCB. While in the fourth mix, 30% of cement weight was replaced by I O%GBFS+ 20%GCB. In the fifth mix, 30% of cement weight was replaced by 30% GCB. The fresh properties of SCC were evaluated such as; filling, passing and segregation properties. Also. the 28 days hardened properties of SCC mixes such as; the compressive, splitting tensile and flexural strengths were measured at room temperature. |