Browsing by Author "Yugcha Lema, Jonathan Andrés"

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    Caracterización del comportamiento frente al fuego de la madera con recubrimiento de barniz utilizados en obra civil
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil, 2025-02) Yugcha Lema, Jonathan Andrés; Viscaíno Cuzco, Mayra Alexandra
    The use of wood coated with varnishes for flooring and wall coverings is widespread in the construction industry. However, its behavior in the event of a fire has been little studied, raising significant questions about its performance in fire scenarios. This research aims to characterize the behavior of Mascarey wood under fire conditions, considering its physical, mechanical, and thermal conductivity properties in three states: natural, coated with Monto brand high-gloss varnish, and coated with Condor brand Espengloss floor lacquer. Physical properties such as color and density were evaluated according to ASTM D 1535 and ASTM D2395 standards, respectively. Mechanical properties were assessed through parallel compression, perpendicular compression, and hardness tests, following the procedure described in ASTM 143-94. Additionally, a fire reaction test was conducted according to the NTE INEN ISO 11925 – 2 standards, using 18 Mascarey wood specimens with a thickness of 20 mm subjected to direct flame exposure, both on the edge and surface. The results indicate that the density of Mascarey wood increased by 4.5 percent when treated with coatings compared to its natural state. Regarding mechanical properties, specimens coated with Monto varnish showed a decrease in parallel and perpendicular to fiber compression resistance, with values of 47.97 N/mm2 and 13.71 N/mm2, respectively. Conversely, specimens coated with Espengloss lacquer showed an increase in these properties, reaching values of 50.03 N/mm2 in parallel compression and 15.06 N/mm2 in perpendicular compression, compared to natural specimens, which recorded values of 48.33 N/mm2 and 14.78 N/mm2, respectively. In terms of hardness, natural Mascarey wood presented the highest values in all three evaluated directions, with a notable value of 1013 kgf in the direction parallel to the fiber. However, in coated specimens, the highest hardness was observed in the radial direction, with values of 647 kgf for specimens coated with Monto varnish and 864 kgf for those coated with Espengloss lacquer. Furthermore, the thermal conductivity of coated Mascarey wood showed a 10 percent increase compared to uncoated specimens. In the fire reaction test, the vertical flame propagation did not exceed 150 mm in any case, classifying Mascarey wood as class D according to the EN 13501-1 standard, both in its natural state and with coatings. Although the coatings did not influence the flame propagation rate, they significantly reduced the carbonization rate. Specimens coated with Espengloss lacquer and Monto varnish recorded a carbonization rate of 0.14 and 0.19 percent, respectively. In contrast, natural specimens recorded a carbonization rate of 0.34 percent.