Waste mineral fibres are an alternative to the reinforcement fibres used nowadays.• After the test mortars reinforced with mineral fiber waste improve thermal properties.• It is possible to replace large amount of the volume of sand used by mineral fiber waste.• Mortars with fibre residues after the fire test maintain its mechanical properties.
At present, nanotechnology aims to be a tool for the generation of advance in engineering, and it is therefore an important factor for the development of society. Nanomaterials are contributing substantially to the making of new technologies, for that reason, to know their interaction with concrete and its reaction to fire is very important. The negative consequences that result from
Due to the importance of concrete as a structural material and the pathologies that can be achieved by reinforced concrete structures when they are subjected to the action of fire both at the level of resistance and deformation, in this research we study the mechanical behavior of mass concrete with the addition of carbon nanofibers (CNFs) when exposed to the action of fire, in order to determine the improvements that this type of addition produces in concrete. To achieve this objective, compression break tests have been carried out on cylindrical concrete specimens incorporating CNFs. From the analysis of results, it can be concluded that the residual resistant capacity of concrete with the addition of 1% of CNFs by weight of cement subjected to the direct action of fire, is greater than that of concrete without additions, not obtaining better results, if the addition of CNFs increases to 2%. The addition of 1% of CNFs has not influenced the temperatures reached in the concrete, but produces a more homogeneous cooling and that the paste-aggregate bond is maintained despite thermal aggression, which decreases the spalling effect.
The present study shows an investigation on the mechanical behavior of the compressive strength in mixed fiber reinforced concretes in comparison with traditional concretes. A hybridization of carbon nanofibers (CNFs) in 1% by weight of cement mixed with steel fibers in 1% by weight of cement was made. The specimens were subjected to the compression rupture test to analyze the maximum rupture stress, the maximum deformation and the deformation energy density and contrast the results with a concrete without additions. The thermal conductivity test and scanning electron microscopy (SEM) were also performed. The results show that concrete with hybridization of steel fibers and carbon nanofibers, in percentages of 1% by weight of cement of each fiber, achieves slightly higher average compressive stresses than non-added concrete, but loses ductility once the maximum stress is reached. The thermal conductivity in fiber-hybridized concrete is similar to that of fiberless concrete, not producing the improvement that could be expected by adding fibers from materials with high thermal conductivity.
Keywords: hybridization, carbon nanofibers, concrete, steel fibers
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