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AGUILAR, M. T. P. et al. Mechanical properties of synthetic fibers reinforeced plaster with silica fume or slag. In: INTERNATIONAL CONFERENCE ON HIGH- PERFORMANCE CONCRETE, AND PERFORMANCE AND QUALITY OF CONCRETE STRUCTURES, 2., 1999, Gramado. Anais… Gramado, 1999.
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Abstract

Nowadays, it is very important to consider three aspects in the concrete study. The applications of steel for synthetic fibers in concrete improve mainly the toughness characteristics of the composite, but the matrix strength also has an important influence on this property. In the other hand, the concrete made with silica fume has a better durability. At last, it is necessary to reuse waste materials. The concrete strength has been available on compressive test. The durability has been studied mainly by permeability. The fiber reinforced concrete toughness characterization is usually investigated by means of bending test, but it can be studied by a tensile test. In this case, the limitation of this technique is the size, geometry and mixing of the specimens. These problems can be minimized, in the first stage of study, if plaster is used instead of concrete. For it to be possible, specially shaped specimens have been made. They were built under non-conventional techniques, and some compatible accessories were necessary to realize the experiments. Considering these points, this paper analyzes the influence of the plaster matrix strength in the mechanical properties. In this way, a plaster with 1.5% of synthetic fibers (nylon), a 10% of silica fume or fine slag (less than 0.075mm) had been used in the experiments. The investigated parameters were permeability, compressive strength and tensile behavior. The results indicate that matrix strength has a strong effect on the toughness characteristics of plaster. Some evidences present in this work show that it is possible to use fine slag to increase the strength of the plaster, and this effect is the same of silica fume. However the toughness is not strongly affected by these additions.
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