Search

The articulation between Teaching, Research and Extension represents a legal condition for the existence of Higher Education Institutions - IES, according to the Federal Constitution of 1988, Article 207, which establishes: "Universities enjoy didactic-scientific, administrative and of financial and patrimonial management, and will obey the principle of inseparability between Teaching, Research and Extension”, sine qua non condition for critical training of future professionals and citizens based on the production and socialization of knowledge, promoting the articulation between the real situation and the ideal of the different operational and administrative, conceptual and pedagogical acts. The article has as general objective to evaluate the articulation between teaching, research and extension as a motivating instrument for the student to participate in Scientific Initiation programs. This is a documental research that sought to analyze the indicators of the Pedagogical Project of Courses-PPC of a Higher Education Institution, regarding evidence of teaching, research and extension articulation. It was observed that once the articulation between teaching, research and extension is not identified in the course evaluation instrument, there are no elements that motivate students to participate in scientific initiation programs, due to the lack of requirement of the National Institute of Studies and Educational Research Anísio Teixeira – INEP.

A escassez de insumos oriundos de recursos naturais e os impactos do processo de produção do cimento são razões para o desenvolvimento de alternativas mais sustentaveis. Reduzir o consumo de cimento é uma dessas alternativas, e isso pode ser feito reciclando materiais cimentícios hidratados por meio da reihratação. Por isso o objetivo desse artigo é compreender o processo de rehidratação de argamassas e concretos desidratados e os efeitos nas propriedades de novos materiais produzidos a partir desses produtos, por meio de revisão sistemática, identificando o mecanismo de reativação de fases hidratadas de argamssas e concretos. As buscas foram realizadas na base de dados da Science Direct no periodo de 2018 a 2019. A busca resultou em 31 artigos que apresentavam o processo de ativação do cimento hidratado e as propriedades de concretos e argamassas com cimento desidratado. A análise dos artigos permitiu compreender como as reações de desidratação e decomposição em pastas de cimento hidratada ocorrem. Foram ainda identificados os compostos formados após a degradção térmica e que é possivel a reação com a água formando produtos iniciais de hidratação tais como etringita, gel C-S-H e CH. Quanto ao desempenho de concretos e argamassas com esses produtos desidratados, ainda são necessárioa smais pesquisa. Mas já é de conhecimento que o melhor desempenho mecanico é alcançado quando essas fases são decompostas na faixa de 660 a 800ºC. É também relatada a baixa reatividade de concretos desidratados devido ao elevado teor de agregados em concretos. A pesquisa demonstrou que estudos ainda precisam ser realizados para viabilizar o uso de argamassas e concretos reidratados. Tais estudos podem agregar valor a um resíduo ainda com aplicações de recilagem restrita

Supplementary cementitious materials (SCM) are proven to be an efficient alternative to lowering concrete carbon footprint by partially replacing cement on its mix design. Glass powder residue (GPR) has great potential to improve concrete’s mechanical performance, and its durability by suppressing the alkali-silica reaction (ASR). However, those qualities can only be achieved by reducing the GPRs particles sizes below cement to fill the binder gaps. In this context, the main objective of this research was to evaluate the grinding parameters to obtain GPR, resulting from the polishing process in the flat glass industry, with the desired properties as SCM. Grinding time was monitored and correlated with glass particle size distribution (GPSD). Optimum GPSD was crossed with mechanical characteristics and ASR reduction in mortars. GPR was tested in 0%, 10%, 15%, 20% and 25% of partial replacement in Brazilian Portland-Pozzonlan cement in mortars and pastes. Consumption of calcium hydroxide was also observed. Four hours of grinding was shown to be the optimum grinding time to lower the GPSD below cement. Moreover, tests suggest that 20% of grinded GPR can be used as partial cement replacement in mortars without lowering its compressive strength and showed positive mitigation in alkali-silica reaction at 14 days of observation. According to the results for the parameters studied, although mortars with 15% of GPR partial replacement had the highest efficiency and performance index, 20% can be considered the maximum GPR replacement content. Any increase represents a decrease in efficiency and performance. The eco-efficiency is observed with the reduction of energy needed to produce cement, as the level of replacement by GPR increases. Therefore, grinded GPR can be an alternative in the production of more environmentally friendly cementitious materials.