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illustrate the variations of the slump and slumpflow of the concrete composite with 15% fly ash and 6% silica fumewith the increase of polypropylene fiber volume fraction, respectively.It can be seen from the figures that the addition of polypropylenefiber decreases the slump and slump flow of the concretecomposite with 15% fly ash and 6% silica fume. With the increaseof fiber volume fraction, both of the slump and slump flow aredecreasing gradually. Compared with the concrete compositewithout polypropylene fiber, the decrease of the slump and slumpflow were determined as 7.7% and 10.7% for the concrete compositewith 0.12% fiber volume fraction respectively. For the slump,there is a sharp decrease when the fiber volume fraction increasesfrom 0.08% to 0.1%. With the increase of fiber volume fraction, thenumber of fibers in unit concrete mixture becomes larger, and thewater absorbed on the surface of the fibers becomes more. Therefore,the obstructive effect of fibers on the flowability of fresh concretebecomes much larger. The addition of polypropylene fibermay be adverse to the workability of fresh concrete containingfly ash and silica fume. The same conclusion on concrete withoutfly ash and silica fume can be drawn based on the existing researchresults
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