Interfacial Behavior of PP Fiber Reinforced Cement Composite (II) ——SEM Observation and Morphological Study on Fracture Surface
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Polypropylene, carbon, aramid and polyethylene fibers reinforced cement composites were fabricated respectively. Their fracture behaviors were observed using scanning electron microscopy and their interfacial bondings between fiber and matrix were discussed in detail.Keywords:
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Short fiber (basalt, carbon, ceramic, and glass) reinforced polypropylene hybrid composites were investigated to determine their mechanical properties in case of different reinforcing fiber types. The composites were reinforced with fibers and were produced by hot pressing after hot mixing techniques. Composite properties such as flexural strength, stiffness, static and dynamic fracture toughness were measured. It was realized that the main damage modes of the composites are fiber pullout and debonding. It was also found that basalt fibers are the most sensitive to the lack of the treatment with additives. These results were supported by scanning electron micrographs taken of the fracture surfaces.
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The objective of this article is to evaluate the effect of some synthetic polymeric fibers on the flexural behavior of cement-based matrix. On this basis, polypropylene (PP), nylon 6,6 (N66), and polyacrylonitrile (PAN) fibers were selected and characterized by optical microscopy, tensile test, aging in chemical solution, surface free energy testing, and scanning electron microscopy. The flexural behavior of fiber-reinforced cementitious composites was determined using a three-point bending test. N66 and PAN fiber reinforced composites had higher toughness and maximum flexural strength, which were in line with the results of surface free energy of the fibers.
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The micro-mechanical behavior of fiber/matrix interfaces and macroscopic mechanical properties of glass fiber reinforced Nylon 6 composites have been characterized for four different fiber surface treatments using in situ microscopic observation techniques. A pull-out test under an optical microscope is conducted to determine the interfacial bond strength of single-fiber embedded composites. An elasto-plastic axisymmetric finite element analysis is then used to explain the experimentally-obtained different failure mechanisms and processes at a broken fiber end. In addition, micro-deformation and failure process in injection-molded composites are observed under tensile loading in a scanning electron microscope (SEM) for specimens reinforced with randomly-oriented short glass fibers with the same fiber surface treatments. It is revealed that micro-damage and fracture characteristics in injection-molded thermoplastic composites are well correlated with micro-mechanical properties of fiber/matrix interfaces of single fiber composites.
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Abstract Bonding strength is an important factor which affects the performance of fiber reinforced cementitious composites. The present work describes the bonding strength between three polymeric fibers (polypropylene (PP), nylon6,6 (N66), and acrylic (AC)) embedded in a cement paste. Also, the pull-out behavior of fibers from cement matrix along with their tensile behavior was studied. The specimens were tested after 7, 14, and 28 curing days with cement to water ratio of 0.5. It was found that although the higher bonding strength to the cement matrix was achieved for AC and PP fibers, the energy absorption capacity of the fibers during composite fracture is obtained for fiber with lower bonding to the cement matrix (N66). Scanning electron micrographs were used to characterize the fiber surface before and after the pull-out tests. Keywords: pull-out behaviorbonding strengthpolymeric fibersmicrostructure
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