The civil engineering construction industry is nowadays one of the largest consumers of natural resources. Therefore, the proposal of using alternative materials that seek to reduce waste production or the use of previously generated waste is becoming increasingly necessary. This paper evaluated the effect of recycled polyethylene terephthalate (PET) strips on the mechanical properties of a cement-treated lateritic sandy soil. Unconfined compression strength (UCS) tests were conducted in natural and PET strips mixtures in different strips lengths and contents. In addition to UCS tests, compaction tests were also conducted in order to analyze the effect of these inclusions on the properties of a lateritic sandy soil. Lastly, direct shear tests were conducted on natural soil-strip, soil-cement, and soil-cement-strip composites using optimum UCS results. The addition of strips to the soil-cement composite showed an increase in the soil cohesion parameter. The inclusion of strips also provided a more ductile behavior to the soil, presenting greater deformations with fewer stress peaks. Results showed that the recycled strips’ inclusion in soil-cement can provide a material with high strength, ductility, and a highly sustainable alternative.
The stress–dilatancy relationship for fiber-reinforced soils has been the focus of recent studies. This relationship can be used as a foundation for the development of constitutive models for fiber-reinforced soils. The present study aims to investigate the effect of recycled polypropylene fibers on the shear strength–dilation behavior of two lateritic soils using the stress–dilatancy relationship for direct shear tests. Results show that fibers improved the shear strength behavior of the composites, observed by increases in the friction angle. Fibers’ orientation at the sheared interface could be observed. The volumetric change during shearing was altered by the presence of fibers in both soils. Overall, results indicate that the stress–dilatancy relationship is affected by inclusions in the soil mix. Results can be used to implement constitutive modeling for fiber-reinforced soils.
A importância da gestão de projetos tem tido maior foco na Era da Informação, devido à volatilidade e alto nível de mudanças, que exigem melhor planejamento e eficácia por parte das organizações. Nessa perspectiva situa-se a construção civil. Esta indústria diferencia-se das demais no que se refere à elaboração de seus produtos e falta de avanços na questão tecnológica. Os gestores de projeto, assim como na maioria das indústrias, representam na construção civil importante papel na dinâmica funcional das organizações. As variadas demandas deste ambiente requerem deles certas competências no que diz respeito à tomada de decisão e a resolução de impasses produtivos. Nesse contexto, o objetivo do estudo é identificar as competências necessárias do gestor de projetos na construção civil, os fatores que influenciam a satisfação no trabalho e a qualidade de vida dos mesmos. Para isso, foi aplicado um questionário online, embasado em bibliografias anteriores. Os dados coletados foram analisados com métodos quantitativos e qualitativos. A principal contribuição prática deste trabalho é apresentar evidências empíricas de que, as competências percebidas como valiosas para o gestor de projetos com foco na construção civil nacional são o planejamento e organização, comunicação efetiva e gestão de mudanças. Estes resultados contribuem para o tema ao discutir em profundidade a área específica de construção civil. Quanto à satisfação e qualidade de vida no trabalho, verificou-se que, apesar dos altos níveis de estresse analisados, a maioria apresentou elevados níveis de satisfação relativos ao cargo ocupado e às atividades realizadas durante o expediente.
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