الفهرس 
CHAPTER (1)( INTRODUCTION)Only 14 pages are availabe for public view
 |  | from | 168 |  |  |
| | | from | 168 | | |
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.