Propriedades Mecânicas de Compósitos Cimento-Madeira com Serragem Tratada de Pinus elliottii

The aim of this research was to investigate the compatibility between cement and wood through the influence of different treatments applied in the sawdust on the mechanical properties of mortars, in which 10% or 20% of the sand in mass was partially replaced by the same volum of Pinus elliottii sawdust with boil treatment and surface treatment with tetraethyl orthosilicate (TEOS). Compressive strength and static and dynamic Young’s modulus decreased with the increase of the percentage of sawdust present in the composites. Treatment with TEOS resulted the highest reduction in compressive strength and the smallest reductions in static and dynamic Young’s modulus. MEV images allowed the identification of composites macro and meso porosity, generated by wood particles and matrix

Sustainability-oriented assessment of pavement technologies: A case study of a heavy-traffic highway in Brazil

The paper proposes a sustainability-oriented assessment through a case study based on the duplication project of one of the most critical federal highways for cargo transport in Southern Brazil, considering the most common pavement technologies used in the country. The framework consists of concatenating life cycle impacts determined through life cycle assessment, the corresponding social effects regarding the population's health and well-being, and the life cycle cost. Results show that while hot mix asphalt contributed 30% more to the damage of natural resources, the Portland cement concrete contributed 16% more to harming ecosystem quality and 27% to harming human health. The photochemical oxidation and climate change potential of Portland cement concrete was 33% and 68% higher than those of hot mix asphalt. The toxic substances potentially released in ecosystems were 27% (freshwater), 15% (marine), and 11% (terrestrial) higher for Portland cement concrete. In contrast, ozone layer depletion potential, cumulative energy demand, and net present value were 36%, 29%, and 89% higher for hot mix asphalt, and the acidification and eutrophication impacts surpassed those of Portland cement concrete by 10% and 8%. Maintenance services are the hotspots for both pavement technologies throughout the life cycle. The significance of the proposed framework relies on guiding local strategic initiatives at the government and agency levels, assisting decision-making processes, and designing business models that meet sustainability requirements for road infrastructure in emerging countries where sustainability-oriented practices are not yet consolidated

Surgical removal of periocular neoformation in Peixe -Kinguiu (Carassius Auratus) submitted to anesthesia with propofol in combination with morphine - case report

ABSTRACT Different anesthetic agents are commonly used during procedures performed in aquaculture to minimize stress and maximize fish welfare during handling. A Kinguio fish was treated with a history of a mass near the left eye. In the clinical evaluation, a pedunculated neoformation was found in the periocular region. The fish was submitted to anesthesia for surgical removal of the mass, which was later referred to histopathological evaluation, revealing myxoma. The anesthesia protocol used 1% propofol at a concentration of 5 mg/liter of water and morphine at a dose of 5 mg/kg, intramuscularly. Immediately after the end of the procedure, the fish was returned to the aquarium and its anesthetic recovery was observed. The objective of this report is to describe a surgical procedure in kinguio fish and to determine the efficacy of propofol associated with morphine in this species. As a result, complete immobilization of the fish was obtained with propofol, reaching the fourth stage of anesthesia and the administration of morphine suggested being able to provide effective and long-lasting analgesia. It is concluded that despite the positive results obtained, anesthesia in fish still needs to be extensively investigated to refine analgesia protocols during procedures that cause pain and stress.</div