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Discontinuous fibers reinforced concrete at the higher fibers volume fraction range (above 4%) behave quite similar to the wiremesh continuous steel reinforced concrete (10), with a strong dependence of the stress / strain curve on fibers content (11).
With that respect, the NewCrete fibers reinforcement of the ferrocement is expected to be complimentary to the wiremesh continuous steel reinforcement - Improving the distribution of reinforcement and contributing toughness and flexibility to the system. Indeed, in an experimental study of hybride composites of brittle fibermesh in addition to flexible fibers matrix reinforcement, synergistic type of behavior was observed with substantial benefits (12): |
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It was found that the tensile response was of typical strong continuous fibers in weak brittle matrix characterized by a post peak response of the continuous fibermesh + short fibers at the cracks tips that dissipate energy via bridging and cracks distributing by the fibermesh and via the pullout of the short fibers respectively. The area under the stress / strain curve used to measure the toughness of the composite showed substantial improvement.
Combinations of Nylon discontinuos fibers with brittle glass wiremesh reinforcement showed superior behavior compared to samples without the short Nylon fibers reinforcement (12).
The finer diameter Nylon fibers showed higher post crack loads.
The results indicate the influence of increasing the specific surface area on the strength of the composite.
This is in a good agreement with our NewCrete fibers that are characterized by smaller diameters and superior surface interactions with the mortar matrix. |
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