Advances and innovations in science and engineering have been increasingly supported by nanotechnology, and the modification of cementitious materials by nanoengineering is an expanding field. With this perspective, this paper aims to elucidate the behavior of steel bars in concrete with the addition of carbon nanotubes (CNTs) as a function of the characteristics of the cement-based material, the dispersion techniques and dosage of CNTs, the bond tests and specimen geometry, and the rebar characteristics. To reach this proposed goal, the ProKnow-C methodology was applied to select the most relevant publications from the last ten years, and then seven articles were fully analyzed. The results of the present systematic review of the literature revealed both consolidated knowledge and gaps to be filled in future research, as the need to study the chemical effect of adding these nanomaterials for improving steel–concrete adhesion, the bonding of thin bars in concrete, and the real influence of anchorage length on the steel–concrete bond, regardless of the use of CNTs, is vital.

<p>A construção civil é um dos setores mais importantes na economia mundial, porém, também é o maior gerador de resíduos, devido aos desperdícios, materiais de baixa qualidade, falta de controle tecnológico, reformas e demolição. Nesse contexto, uma das aplicações para os resíduos gerados é a sua utilização como agregados reciclados (AR) em substituição aos agregados naturais (AR) em materiais cimentícios. Então, o emprego de AR para a fabricação de materiais destinados para fins estrutural, como o concreto, precisa ser mais bem investigada, de maneira que o limite máximo permitido pela NBR 15116 (20% de substituição) possa ser aumentado com segurança em futuras revisões. Com essa perspectiva, este trabalho apresenta uma breve revisão de literatura, elucidando algumas das principais propriedades dos resíduos de construção e demolição quando empregados no concreto, como heterogeneidade, trabalhabilidade e porosidade, resistência à compressão, resistência à tração, módulo de elasticidade e resistência à abrasão, absorção de água, carbonatação e penetração de íons cloreto.</p>

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This paper is part of an extension project aimed at renovating the Carlos Romeiro Asylum, located in Conselheiro Lafaiete, Minas Gerais, starting from an initial conception about the current state of the building. For this, it was developed a literature review on the main cause of pathologies that affect the building, infiltration and humidity damage, and others. A case study will be presented, showing the main physical deficiencies of this resting house, to propose interventions based on Material Science and Civil Engineering. Because it is a place where the construction work must be done concomitantly with the circulation of people, this project needs to be divided into stages. It is important to point out that this work may involve both recovery materials and methods, which aim to reestablish the original conditions of the damaged structures, and reinforcement, which aim to adjust the resistant capacity of the structures according to their use. The development and application of this project will bring improvements to the elderly population of the asylum, enabling better health and mobility conditions inside the space where more than sixty old people live.

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