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|Title||Mechanical Properties of Ultra High Performance Fiber Reinforced Self-Compacting Concrete|
The usage of ultra-high strength concrete with high compressive strength in construction applications has been increasing worldwide and will make an impact in Gaza Strip due to the limited land area available for construction, the fast growing population and due to bad and unstable political conditions and the continuing wars in Gaza Strip, strong, relatively cheap, easy to use and locally available repairing and strengthening material should be produced for that purposes as well. The main goal of this research is to produce Ultra High Performance Fiber Reinforced Self Compacting Concrete in Gaza strip, using materials that are available at the local markets. Different trial mixes were used to obtain the acceptable fresh properties of self-compacting concrete with a compressive strength exceeding 177 MPa. The research includes also the use of a recognized manufacturer mineral admixture, steel fibers, quartz sand, superplasticizers and without using any type of aggregates other than the quartz sand. The fresh and hardened mechanical properties of Ultra High Performance Fiber Reinforced Self Compacting Concrete were studied, such as, workability, self-compacting properties, compressive strength, split cylinder strength, and flexural strength. The effects of using different steel fibers and silica fume doses on these properties are obtained within the research work. The effect of adding different amounts of Polypropylene fibers (0.45 kg/m3, 0.9 kg/m3 and 1.8 kg/m3) on the fresh and hardened properties of Ultra High Performance Fiber Reinforced Self Compacting Concrete is also investigated. Results show that it is possible to produce Ultra High Performance Fiber Reinforced Self Compacting Concrete in Gaza strip using materials that are available at the local markets if they are carefully selected and will achieve a minimum compressive strength of 177 MPa at the age of 28 days. Such concretes can be produced with cement, Water/Cement ratoi of 0.24, steel fibers (16% by the weight of cement), polypropylene fibers (0.9 kg/m3), quartz sand (125% by the weight of cement), and silica fume (15% by the weight of cement) as the mineral admixture (3% superplasticizer by the weight of cement.
|Publisher||الجامعة الإسلامية - غزة|
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