ملخص الدراسة:

Owing to the shortage of space for land reclamation in Gaza Strip, it is difficult to dispose tons of construction and demolition waste generated daily from construction activities and destroying of building during Israeli campaigns in addition to the huge amount of ex-settlements destroyed buildings. Adoption of recycled aggregate from concrete waste thus becomes a burning issue. The main goal of this research is to obtain concrete mixes with optimum replacement of natural aggregate with recycled aggregate considering Forta Ferro Fibers to ensure the actual ductility of concrete. Different trial mixes were used to obtain the acceptable hardened properties of fiber reinforced concrete with recycled aggregate by using a recognized manufacturer mineral cement, Aggregates (Recycled, Natural), Forta Ferro Fibers (FF Fiber), Quartz sand, water in addition to superplastisizers. To determine those properties, experimental work has been carried out. Three batches of concrete have been cast: one with no fibers and the remaining with two different volume fibers fractions of 0.5% and 1.0% with different percentage of recycled aggregates 0.0% ,50% and 100%. Concrete specimens (cubes, cylinders and beams) have been cast to determine the mechanical behavior such as compressive, tensile, flexural strength and load - deflection relationships. Test results have showed that fibers cause decrease in the compressive strength insignificantly, while the replacement of natural aggregate by recycled aggregate (RA) causes the decrease in the compressive strength but it is still above the target strength. However, Splitting tensile strength due to fiber addition increased about 10% to 30% of the original. Split tensile strength at 28’days is 48% higher than 7 day’s strength using 1.0% FF Fiber. It is clear that the indirect tensile test indicates that it decreases when the percentage of recycled aggregate (RA) increases. On the other hand, it is observed that a general gradually increases trend in the flexural strength when using 0.5% to 1.0% FF Fiber. However, the concrete reinforced with Forta Ferro Fibers (FF Fiber) has showed more ductile behavior compared to the plain concrete

توثيق المرجعي (APA)