Browsing by Issue Date, starting with "2024-04-04"
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- Betão leve de estrutural aplicado a sistemas de fachadas pré-fabricadasPublication . Tamura, Rodrigo Teruaki; Oliveira, Maria do Rosário SantosThe use of precast concrete parts is no longer a novelty in the civil construction market. Several authors cite the advantages of its use, such as reduced construction time added to greater durability of the structure. One of the limitations of its use is the weight of the pieces, which require specific equipment for assembly. The present study aimed to develop lightweight concrete mixtures using a dosage method based on particle packing, for application in precast concrete panel pieces. For the dosage of these concretes, a particle packing method was used, which consists in improving the distribution between the materials used (gravel, clay, EPS, sand and cement) by filling the voids that are left between the materials of larger size with those of smaller size. Through the tests performed, the concretes presented positive results, reaching strengths above 30 MPa and spreads above 600 mm. Therefore, it can be concluded that the method used presents great potential when the objective is linked to concretes that use lightweight aggregates for precast parts. Analyzing the relationship between the calculation methodology used, the structural verifications performed, the results and the applicability of the final products generated, it can be concluded that its application generates impacts such as reducing the weight of the structure and the amount of steel used without affecting the structural balance of the model.
- Integração de princípios de economia circular nas operações e cadeias de abastecimento de uma indústria motores elétricos: um estudo de casoPublication . Andrade, Guilherme de Souza; Pereira, Maria Teresa RibeiroThe electric motor market is undergoing remarkable growth, driven by its adoption across various industrial sectors. This increasing demand underscores the critical need for effective end-of-life management strategies for electric motors and the responsible handling of the high-value materials embedded within them. This dissertation endeavors to formulate a comprehensive framework for the integration of circular economy principles into the supply chain of the electric motor industry. The literature review revealed that methodologies for selecting the best end-of-life scenario for industrial electric motors are still a scarce topic. Among the identified strategies, recycling emerges as the primary focus area for research. Motor recovery, albeit underexplored, is recognized as pivotal in extending product lifecycles. To gain a comprehensive understanding of the current landscape, an exhaustive analysis of winding processes has been conducted. This analysis encompasses an in-depth review of the supply chain for the resins utilized in motor impregnation and the copper employed for winding. Furthermore, a close examination of the service sector responsible for motor recovery has been undertaken. Subsequently, the proposed circular economy framework is systematically applied to the processes and supply chain of the electric motor industry. This framework is designed to serve as an inaugural step, facilitating the industry's adoption of circular economy strategies. Implementation of these strategies has the potential to significantly enhance the overall sustainability performance of the electric motor industry.