This research aimed to evaluate the effect of adding different polymeric waste percentages and types on the physical, mechanical, thermal and durability properties of soil-cement bricks. Tire and PET (Polyethylene Terephthalate) waste were evaluated at 1.5 and 3.0% percentages. The soil was characterized in terms of shrinkage, compaction, consistency limits, particle size and chemical analyses, whereas the waste particles were submitted to morphological characterization. The bricks were produced in an automatic press with a 90: 10 (m/m) soil: cement ratio. The soil-cement bricks were characterized by density, moisture, water absorption, loss of mass by immersion, compressive strength, thermal conductivity and microstructural analysis. PET waste stood out for its use as reinforcement in soil-cement bricks. The best performance was obtained for bricks reinforced with 1.5% PET, which showed a significant compressive strength improvement, meeting the marketing standards criteria, even after the durability test, as well as obtaining the lowest thermal conductivity values. The percentage increase from 1.5% to 3.0% fostered a significant water absorption and loss of mass increase, as well as a significant compressive strength reduction of the bricks.
The need for environmental preservation requires civil engineering to reach new concepts and technical solutions aiming at the sustainability of its activities and products. In this context, this study aimed to evaluate the effect of using different types and percentages of vegetable particles on the physical, mechanical and thermal properties of soil-cement bricks. Bamboo, rice husk and coffee husk particles at 1.5 and 3% percentages and a control treatment not using the particle were evaluated. The chemical properties, shrinkage, compaction, consistency limits and grain size were characterized for the soil; and the anatomical, chemical and physical properties for the lignocellulosic particles. The bricks were produced using an automatic press and characterized after the curing process for density, water absorption, porosity, loss of mass by immersion, compressive strength, durability and thermal conductivity. The increase in the lignocellulosic waste percentage caused a mechanical strength decrease and bricks` porosity and water absorption increase. However, it caused a decrease in density and an enhancement in loss of mass and thermal insulation properties. The bricks produced with rice husk obtained the best results in terms of mechanical and thermal properties, and were still among the best treatments for physical properties, standing out among the lignocellulosic waste as an alternative raw material source for soil-cement bricks production.
Heat treatment aims to reduce the compression stresses generated during the panel production, improving its dimensional stability and providing greater resistance to attack by xylophagous organisms, despite decreasing the mechanical properties. This work aimed to evaluate the physical-mechanical properties of medium density particleboard (MDP) of Eucalyptus sp. subjected to post-heat treatment with two temperature levels (200 and 260ºC) and two periods (5 or 10 minutes). The apparent density, water absorption and thickness swelling (TS) after 2 and 24h, internal bonding, MOE and MOR in static bending were evaluated. The post-heat treatment at 200 °C for 5 minutes was the most efficient, improving the TS, with smaller reductions in the mechanical properties. The temperature had a greater influence in the first hours of immersion in water (TS2h), while for a longer period (TS24h) the heat treatment time was more effective. The temperature influenced the mechanical properties more negatively than the heat treatment time.
A tecnologia faz parte da nossa vida, já não conseguimos viver sem ela. Conscientes do alto consumo de energia dos computadores e periféricos, e o uso destes cada vez mais em crescimento numa sociedade interligada por redes sociais, entre outros, se faz necessário trabalhar com a TI Verde, trazendo compreensão e apontando soluções, a fim de contribuir com o descarte sustentável de lixo eletrônico, uso de energias alternativas, entre outros, encontrando assim soluções que minimizem esse problema e ajudem com projetos sustentáveis e econômicos. Assim, os profissionais de TI em geral, muito podem contribuir para com o meio ambiente e a TI Verde. Desta forma, este estudo bibliográfico em questão, teve como principal objetivo verificar se a temática ambiental/TI Verde tem sido implementada no curso de Análise de Sistemas da Universidade do Estado de Minas Gerais – UEMG - Unidade Frutal, tendo em vista seu papel estratégico na preparação de profissionais da área de computação, diante da nova realidade do nosso planeta. Para tal, utilizou-se do embasamento teórico disponibilizado na literatura relacionada à temática, dados oficiais no sítio da universidade, bem como documentos e informações da coordenação do curso em específico, com questões pontuais e públicas a respeito do projeto pedagógico do curso.
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