الفهرس 
LITERATURE SURVEYOnly 14 pages are availabe for public view
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Abstract
The current thesis presents both experimental and numerical study for strengthened RC slabs subjected to DROP weight and static loading؛ The strengthening technique was based on utilizing a thin layer of Ultra High Performance Strain Hardening Cementitious Composites (UHP-SHCC) at either tension or compression side. The surface preparation between the substrate slab and the UHP-SHCC layer was the main parameter where three conditions were implemented; namely grinding, grinding plus epoxy resin and grinding plus steel dowels. The DROP weight was felt from three different heights; 1, 1.5 and 2m simulating low velocity impact loading on the slabs. For comparison purposes, incremental static loading was performed on typical un-strengthened and UHP-SHCC strengthened slabs. Finally, nonlinear finite element model using ABAQUS software was performed to simulate the tested slabs under both impact and static loading. The thesis consists of six chapters, which starts with stating the problem, objectives of the research, methodology and organization of the work as presented in Chapter (1). In Chapter (2), comprehensive literature survey and annotated review of the previous research work in the field of Ultra High Performance Strain Hardening Cementitious Composites strengthening technique are presented. In addition, broad overview on the experimental work carried out on the impact resistance of strengthened slab is also presented. Chapter (3) demonstrates the methodology of the research and its tools. Materials used in experimental program, specimens configuration, testing v setup, and instruments are described. Phase I intended to study the effect of internal RFT on the tensile characteristics of the UHP-SHCC. Phase II; impact loading, Sixty-three specimens were prepared and divided into three groups; group I was designed to evaluate the efficiency of unstrengthened reinforced concrete slabs under the effect of impact loading, while group II was designed to evaluate the efficiency of strengthening reinforced concrete slabs using UHP-SHCC layer on tension side, finally group III was designed to evaluate the efficiency of strengthening reinforced concrete slabs using UHP-SHCC layer on compression side. Phase III investigated one unstrengthened and six UHP-SHCC strengthened slabs under the effect of static loading. The experimental results of all test specimens were described in Chapter (4). Recorded data on maximum mid-span deflections, cracks propagations, and failure modes are listed and observations are presented of all three phases. Analytical model used to simulate the behavior up to failure of all tested specimens using ABAQUS is presented in Chapter (5). Finally, the main conclusions for the studied parameters are presented along with main points to be covered in future work are given.