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Mechanical behavior of cement-based materials reinforced with sisal fibers
Fiber-reinforced cement composites were produced in Brazil using blast furnace slag cement reinforced with pulped fibers of sisal originated from agricultural by-products. Thin pads were produced by slurring the raw materials in water, followed by de-watering and pressing stages. Studies of mechanical behavior included observations of stable crack growth behavior under monotonic loading (resistance-curve behavior), followed by scanning electron microscopy (SEM) analysis of the fracture surfaces. Reinforcement with cellulose fibers resulted in improved fracture toughness, even after 9 months in laboratory environment. Microscopic analysis indicated a considerable incidence of crack bridging and fiber pull-out in the composite. The shielding contributions from crack bridging are estimated using a fracture mechanics model, before comparing with the measured resistance-curve behavior. The toughness values predicted by both small and large scale bridging models were lower than the corresponding experimental measurements, since these models are not able to account for all the variables involved in toughening mechanisms during fracture of these composite materials. The LSB model yielded more accurate toughness predictions at large crack lengths. The intrinsic toughness was estimated to be -0.84 MPa square root of m. This represents the true specimenindependent fracture toughness value of the material that was examined in this study.
Mechanical behavior of cement-based materials reinforced with sisal fibers
Fiber-reinforced cement composites were produced in Brazil using blast furnace slag cement reinforced with pulped fibers of sisal originated from agricultural by-products. Thin pads were produced by slurring the raw materials in water, followed by de-watering and pressing stages. Studies of mechanical behavior included observations of stable crack growth behavior under monotonic loading (resistance-curve behavior), followed by scanning electron microscopy (SEM) analysis of the fracture surfaces. Reinforcement with cellulose fibers resulted in improved fracture toughness, even after 9 months in laboratory environment. Microscopic analysis indicated a considerable incidence of crack bridging and fiber pull-out in the composite. The shielding contributions from crack bridging are estimated using a fracture mechanics model, before comparing with the measured resistance-curve behavior. The toughness values predicted by both small and large scale bridging models were lower than the corresponding experimental measurements, since these models are not able to account for all the variables involved in toughening mechanisms during fracture of these composite materials. The LSB model yielded more accurate toughness predictions at large crack lengths. The intrinsic toughness was estimated to be -0.84 MPa square root of m. This represents the true specimenindependent fracture toughness value of the material that was examined in this study.
Mechanical behavior of cement-based materials reinforced with sisal fibers
Mechanisches Verhalten von mit Sisalfasern verstärkten Werkstoffen auf Zementbasis
Savastano, H. jun. (Autor:in) / Turner, A. (Autor:in) / Mercer, C. (Autor:in) / Soboyejo, W.O. (Autor:in)
Journal of Materials Science ; 41 ; 6938-6948
2006
11 Seiten, 8 Bilder, 1 Tabelle, 44 Quellen
Aufsatz (Zeitschrift)
Englisch
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