الفهرس 
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Abstract
Lightweight concrete (LWC) is one of the favourable used concrete as it has low density with acceptable high strength, high durability, and toughness. The main advantage of LWC is the reduction of the structural dead load, foundation loads, the sections of all structural elements, and consequently the overall cost of the structure.
For any reinforced concrete element, there should exist a sufficient bond between the concrete and the reinforcing bars to allow flowing the force between the two materials.
This thesis presents new kind of LWC has the advantages of normal density concrete , cellular concrete and high workability concrete through partially replacing the normal weight aggregates with polystyrene foam particles.
The experimental program consisted of testing 72 pull-out specimens for ( LWC and NWC ) the LWC has dry unit weight of 18.31 kN/m3 which in turn leads to self weight reduction by 15 – 20% from NWC .
The considered parameters in this study are the effect of concrete type ( LWC and NWC ) , bar diameter through using 10 , 16 , 18 and 22 mm deformed reinforcement bars and the embedded length (5Ø, 4Ø , 3Ø)The pullout test uses a 150×150×150 mm standard concrete cube and the results found that LWC failure loads were close to NWC failure loads and decreasing the bond length from (5) to (3) decreases the failure load by 20% .