Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Volcanic atmospheres impact on mechanical properties of Tectona grandis and Cupressus lusitanica in early stages of outdoor exposure
Abstract This research aimed to evaluate the impact of the volcanic atmosphere on the mechanical properties, modulus of elasticity (MOE), and rupture (MOR), of Cupressus lusitanica and Tectona grandis using structural size specimens in early stages of exposure with time series (3, 6, 9, 12, 18, 24, and 30 months. Despite the inter-sites’ acid variables (SO2, pH, SO4 2-), no significant differences in MOE-MOR were found. A climate-based model was successfully established to estimate structural-size specimen´s MOE in the early degradation stages. The main mechanical properties give a theoretical and practical framework to estimate the material performance of touristic natural facilities.
Highlights We proposed a climate-based model to estimate MOE in the early degradation stages. The experimentally obtained MOE showed sinusoidal behaviour regardless of species/sites. A Principal components analysis (PCA) describes the complex atmospheric system. Despite the inter-site acidic difference species showed no significant differences in their mechanical performance (α0.05). The material showed resistance to harsh volcanic environments during the study period.
Volcanic atmospheres impact on mechanical properties of Tectona grandis and Cupressus lusitanica in early stages of outdoor exposure
Abstract This research aimed to evaluate the impact of the volcanic atmosphere on the mechanical properties, modulus of elasticity (MOE), and rupture (MOR), of Cupressus lusitanica and Tectona grandis using structural size specimens in early stages of exposure with time series (3, 6, 9, 12, 18, 24, and 30 months. Despite the inter-sites’ acid variables (SO2, pH, SO4 2-), no significant differences in MOE-MOR were found. A climate-based model was successfully established to estimate structural-size specimen´s MOE in the early degradation stages. The main mechanical properties give a theoretical and practical framework to estimate the material performance of touristic natural facilities.
Highlights We proposed a climate-based model to estimate MOE in the early degradation stages. The experimentally obtained MOE showed sinusoidal behaviour regardless of species/sites. A Principal components analysis (PCA) describes the complex atmospheric system. Despite the inter-site acidic difference species showed no significant differences in their mechanical performance (α0.05). The material showed resistance to harsh volcanic environments during the study period.
Volcanic atmospheres impact on mechanical properties of Tectona grandis and Cupressus lusitanica in early stages of outdoor exposure
Paniagua-Hernández, Viviana (Autor:in) / Torres-Quirós, Cindy (Autor:in) / González-Rodrigo, Beatriz (Autor:in) / Murillo-Montero, Jimena (Autor:in)
04.01.2024
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
ASTM , American Society for Testing and Materials , B.C , Braulio Carrillo, (control site. Non-Acid site) , CI , Confidence intervals , CICIMA , Center for Research in Materials Science and Engineering, University of Costa Rica , Cl<sup>-</sup> , Chloride. Anion analyzed in rainwater , CNE , National Emergency Commission , F<sup>-</sup> , Fluoride. Anion analyzed in rainwater , FUNDECOR , Central Volcanic Mountain Range Development Foundation (meteorological station) , H<inf>2</inf>O<inf>2</inf> , Hydrogen peroxide , H<inf>2</inf>S , Hydrogen sulphide , H<inf>2</inf>SO<inf>4</inf> , Sulphuric acid , HCl , Hydrogen chloride , HSO<inf>3-</inf> , Bisulphide , IMN , National Meteorological Institute , INTE , INTECO Institute of Technical Standards of Costa Rica , KMO , Kaiser-Meyer-Olkin, adequacy factor, to perform APC-PCA , LANAMME , National Laboratory of Materials and Structural Models , LAQAT-UNA , Atmosphere Chemistry Laboratory-UNA National University , LOP , Limit of proportionality , LVDT , Linear Variation Differential Transformer , MC , Moisture content , MOE , Modulus of elasticity , MOR , Modulus of rupture , MSE , Mean squared error, mean square error , MTS , A universal testing machine, an acronym in English , NO<inf>3-</inf> , Nitrate. Anion analyzed in rainwater , OVSICORI , Volcanological and Seismological Observatory of Costa Rica , P , Poás, name of the Volcano and National Park (acid site) , PC , Principal Component , PCA , Principal Component Analysis, CPA , RH , Relative humidity , SINAC , National Conservation Areas System of Costa Rica , SO<inf>2</inf> , Sulphur dioxide , SO<inf>4</inf> <sup>2-</sup> , Sulphate. Anion analyzed in collected rainwater , Wood degradation , Modulus of elasticity MOE , Sulphur dioxide SO<inf>2</inf> volcanic acid atmospheres , Outdoor exposure
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