الفهرس | Only 14 pages are availabe for public view |
Abstract Since normal concrete is subjected to large dead loads, bleeding and segregation during casting process, vibration is necessary for compaction especially in reinforced concrete sections with dense reinforcement ratios. Lightweight concrete is known for its advantage of high capacity of thermal insulation, high durability and decreasing the self-weight of the structures, which then allows the structural designer to reduce the size of column, footings and other load bearing elements. Thus the construction cost can be saved when applied to structures such as long-span bridge and high rise building. Structural lightweight concrete mixtures can be designed to achieve similar strengths as normal weight concrete. The marginally higher cost of the lightweight concrete is offset by size reduction of structural elements, less reinforcing steel and reduced volume of concrete, resulting in lower overall cost. Self-compacted concrete (SCC) has good properties compared to normal concrete, it is compacted under its own weight. Self-compacted concrete is a new generation of special concrete, where no inner or outer vibration is necessary needed for compaction. The development leading to a light weight self-compacting concrete (LWSCC) represents an important innovative step in the recent years. This concrete combines the favorable properties of a lightweight concrete with those of a selfcompacting concrete. Research work is aimed on development of (LWSCC) with the use of light weight aggregates. This research presents an experimental-analytical investigation in the flexural behavior of reinforced lightweight self-compacting concrete (LWSCC) slabs. (LWSCC) was obtained through the use of expanded clay aggregates to reduce the concrete dry unit weight from 23.0 kN/m3 to 18.5 kN/m3. The experimental investigation consisted of two phases; namely, the (LWSCC) mechanical properties and the flexural behavior of reinforced (LWSCC) slabs. The mechanical properties combined the fresh properties and compressive strength. In the second phase, experiments were conducted on twelve medium scale (RC) slabs under loading till failure. The flexural reinforcement ratio amount, statical system and loading case, were the main parameters investigated. Finally, the experimental capacities of slabs were compared to the ACI 318-2008, BS8110- 1997 and the ECP203-2007 code. |