Polymer Composite
Daily Maria Gallegos; Denis Mayta; Gerhard Paúl Rodriguez; Fredy Alberto Huaman; Fernando Alonso Cuzziramos
Abstract
The effect of the addition of alpaca fibers on the mechanical response of geopolymeric mortars was studied using uniaxial compression tests. The studied mortars were manufactured by mixing mining tailings, fine sand and variable percentages of alpaca wool fibers. The mechanical results show a higher ...
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The effect of the addition of alpaca fibers on the mechanical response of geopolymeric mortars was studied using uniaxial compression tests. The studied mortars were manufactured by mixing mining tailings, fine sand and variable percentages of alpaca wool fibers. The mechanical results show a higher degree of deformation, up to 6%, for the mortar mixtures with higher amounts of wool fiber in their composition, that is, the decrease in maximum compressive strength was demonstrated as the volume increased of added fibers, the values were from 32 to 9 MPa for samples with 0 and 8 % Vol. of added fibers, respectively. On the other hand, studies of the real density and the average porosity were carried out, obtaining values of 2.59 g/cm3 and 31 %, respectively. Additionally, the morphological analysis was carried out using microscopy in which a continuous binder geopolymer phase could be seen and within this phase a phase of sand and fibers.
Composite Materials
Miranda Benavides; Denis Leonardo Mayta; Fernando Alonso Cuzziramos; Gerhard Paul Rodriguez; Fredy Alberto Huaman-Mamani
Abstract
The traditional method of manufacturing SiC compounds is associated with a serious environmental problem, mainly due to the need for large amounts of energy (generally derived from oil) to reach processing temperatures (typically above 2500 ºC). In addition, the chemical reaction that gives rise ...
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The traditional method of manufacturing SiC compounds is associated with a serious environmental problem, mainly due to the need for large amounts of energy (generally derived from oil) to reach processing temperatures (typically above 2500 ºC). In addition, the chemical reaction that gives rise to the formation of SiC has CO and CO2 as by-products. Therefore, in this work an alternative method to manufacture SiC/Si composites using waste from the wood industry as the main raw material was developed. SiC/Si composites were fabricated by infiltration of molten silicon into carbon preforms at 1500 °C. The carbon preforms were obtained by pyrolysis (in an inert Ar atmosphere) of four types of resin-carbon mixtures. The carbon used in the mixtures was obtained by pyrolysis of sawdust powder.The mechanical and thermomechanical behavior in uniaxial compression was studied at a constant compression rate of 0.05 mm/min at different temperatures (ambient, 1100 °C and 1400 °C). The maximum resistance values found were in the range of 58 and 384 MPa, while the Young's modulus values were between 40 and 120 GPa. The porosity found in the materials was between 1 and 4%. Finally, the fabricated compounds presented a homogeneous microstructure of interconnected silicon carbide in gray contrast and dispersed and unconnected whitish phases of uniformly distributed silicon.
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